131 relations: Alexander Meissner, Alternating current, Amplifier, Arc converter, Arc lamp, Armstrong oscillator, Audio frequency, Audion, Auguste Arthur de la Rive, Balthasar van der Pol, Barkhausen stability criterion, Barkhausen–Kurz tube, Bipolar junction transistor, Capacitance, Capacitor, Cathode ray tube, Cavity magnetron, Clapp oscillator, Clock signal, Colpitts oscillator, Counter (digital), Crystal oscillator, Current source, David Edward Hughes, Delay-line oscillator, Demodulation, Dielectric resonator, Direct current, Dynatron oscillator, Edwin Howard Armstrong, Electric arc, Electronic circuit, Electronic filter, Elihu Thomson, Ernst Lecher, Extended interaction oscillator, Feedback, Filter (signal processing), Flip-flop (electronics), Frequency, Frequency synthesizer, Function generator, George Francis FitzGerald, God Save the Queen, Gunn diode, Gyrotron, Harmonic, Harry Nyquist, Hartley oscillator, Heinrich Barkhausen, ..., Hendrik Wade Bode, Heterojunction bipolar transistor, High-electron-mobility transistor, IMPATT diode, Inductor, Injection locking, Institute of Radio Engineers, Institution of Electrical Engineers, Integrating ADC, Irving Langmuir, Klystron, LC circuit, Lee de Forest, Limit cycle, Linear circuit, Local oscillator, Low-frequency oscillation, MESFET, Microwave, Mobile phone, Modulation, Multivibrator, Negative resistance, Noise (electronics), Numerically controlled oscillator, Operational amplifier, Opto-electronic oscillator, Oscillation, Oscilloscope, Parametric oscillator, Pearson–Anson effect, Phase-locked loop, Phase-shift oscillator, Pierce oscillator, Piezoelectricity, Port (circuit theory), Positive feedback, Power inverter, Q factor, Quartz, Quartz clock, Radio frequency, Radio receiver, RC oscillator, Regenerative circuit, Relaxation oscillator, Resistor, Resonance, Resonator, Ring oscillator, Robinson oscillator, Royer oscillator, Sawtooth wave, Schmitt trigger, Sequential logic, Signal generator, Sine wave, Square wave, Surface acoustic wave, Switched-mode power supply, Synthesizer, Television, Television transmitter, Transistor, Transmitter, Tri-tet oscillator, Triangle wave, Triode, Tunnel diode, Two-port network, Ultra high frequency, Vackář oscillator, Vacuum tube, Valdemar Poulsen, Van der Pol oscillator, Varicap, Video game, Voltage-controlled oscillator, Waveguide, Wien bridge oscillator, William Duddell. Expand index (81 more) » « Shrink index
Alexander Meissner (in German: Alexander Meißner) (September 14, 1883 – January 3, 1958) was Austrian engineer and physicist.
Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction.
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current).
The arc converter, sometimes called the arc transmitter, or Poulsen arc after Danish engineer Valdemar Poulsen who invented it in 1903, was a variety of spark transmitter used in early wireless telegraphy.
An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc).
The Armstrong oscillator (also known as the Meissner oscillator) is an electronic oscillator circuit which uses an inductor and capacitor to generate an oscillation.
An audio frequency (abbreviation: AF) or audible frequency is characterized as a periodic vibration whose frequency is audible to the average human.
The Audion was an electronic detecting or amplifying vacuum tube invented by American electrical engineer Lee de Forest in 1906.
Prof Auguste Arthur de la Rive FRSFor HFRSE (October 9, 1801November 27, 1873) was a Swiss physicist.
Balthasar van der Pol (27 January 1889 – 6 October 1959) was a Dutch physicist.
In electronics, the Barkhausen stability criterion is a mathematical condition to determine when a linear electronic circuit will oscillate.
The Barkhausen–Kurz tube, also called the retarding-field tube, reflex triode, B–K oscillator, and Barkhausen oscillator was a high frequency vacuum tube electronic oscillator invented in 1920 by German physicists Heinrich Georg Barkhausen and Karl Kurz.
Capacitance is the ratio of the change in an electric charge in a system to the corresponding change in its electric potential.
A capacitor is a passive two-terminal electrical component that stores potential energy in an electric field.
The cathode ray tube (CRT) is a vacuum tube that contains one or more electron guns and a phosphorescent screen, and is used to display images.
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators).
The Clapp oscillator is one of several types of LC electronic oscillator constructed from a transistor (or vacuum tube) and a positive feedback network, using the combination of an inductance with a capacitor for frequency determination.
In electronics and especially synchronous digital circuits, a clock signal is a particular type of signal that oscillates between a high and a low state and is used like a metronome to coordinate actions of digital circuits.
A Colpitts oscillator, invented in 1918 by American engineer Edwin H. Colpitts, is one of a number of designs for LC oscillators, electronic oscillators that use a combination of inductors (L) and capacitors (C) to produce an oscillation at a certain frequency.
In digital logic and computing, a counter is a device which stores (and sometimes displays) the number of times a particular event or process has occurred, often in relationship to a clock signal.
A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a precise frequency.
A current source is an electronic circuit that delivers or absorbs an electric current which is independent of the voltage across it.
David Edward Hughes (16 May 1831 – 22 January 1900), was a British-American inventor, practical experimenter, and professor of music known for his work on the printing telegraph and the microphone.
A delay-line oscillator is a form of electronic oscillator that uses a delay line as its principal timing element.
Demodulation is extracting the original information-bearing signal from a carrier wave.
A dielectric resonator is a piece of dielectric (nonconductive) material, usually ceramic, that is designed to function as a resonator for radio waves, generally in the microwave and millimeter wave bands.
Direct current (DC) is the unidirectional flow of electric charge.
In electronics, the dynatron oscillator, invented in 1918 by Albert Hull at General Electric, is an obsolete vacuum tube electronic oscillator circuit which uses a negative resistance characteristic in early tetrode vacuum tubes, caused by a process called secondary emission.
Edwin Howard Armstrong (December 18, 1890 – February 1, 1954) was an American electrical engineer and inventor, best known for developing FM (frequency modulation) radio and the superheterodyne receiver system.
An electric arc, or arc discharge, is an electrical breakdown of a gas that produces an ongoing electrical discharge.
An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow.
Electronic filters are circuits which perform signal processing functions, specifically to remove unwanted frequency components from the signal, to enhance wanted ones, or both.
Elihu Thomson (March 29, 1853 – March 13, 1937) was an English-born American engineer and inventor who was instrumental in the founding of major electrical companies in the United States, the United Kingdom and France.
Ernst Lecher (1 June 1856 – 19 July 1926) was an Austrian physicist who, from 1909, was head of the First Institute of Physics in Vienna.
The extended interaction oscillator (EIO) is a linear-beam vacuum tube designed to convert direct current to RF power.
Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop.
In signal processing, a filter is a device or process that removes some unwanted components or features from a signal.
In electronics, a flip-flop or latch is a circuit that has two stable states and can be used to store state information.
Frequency is the number of occurrences of a repeating event per unit of time.
A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency.
A function generator is usually a piece of electronic test equipment or software used to generate different types of electrical waveforms over a wide range of frequencies.
Prof George Francis FitzGerald FRS FRSE (3 August 1851 – 22 February 1901) was an Irish professor of "natural and experimental philosophy" (i.e., physics) at Trinity College in Dublin, Ireland, during the last quarter of the 19th century.
"God Save the Queen" (alternatively "God Save the King", depending on the gender of the reigning monarch) is the national or royal anthem in a number of Commonwealth realms, their territories, and the British Crown dependencies.
A Gunn diode, also known as a transferred electron device (TED), is a form of diode, a two-terminal passive semiconductor electronic component, with negative resistance, used in high-frequency electronics.
A gyrotron is a high-power linear-beam vacuum tube which generates millimeter-wave electromagnetic waves by the cyclotron resonance of electrons in a strong magnetic field.
A harmonic is any member of the harmonic series, a divergent infinite series.
Harry Nyquist (born Harry Theodor Nyqvist,; February 7, 1889 – April 4, 1976) was a Swedish-born American electronic engineer who made important contributions to communication theory.
The Hartley oscillator is an electronic oscillator circuit in which the oscillation frequency is determined by a tuned circuit consisting of capacitors and inductors, that is, an LC oscillator.
Heinrich Georg Barkhausen (2 December 1881 – 20 February 1956), born at Bremen, was a German physicist.
Hendrik Wade BodeVan Valkenburg, M. E. University of Illinois at Urbana-Champaign, "In memoriam: Hendrik W. Bode (1905-1982)", IEEE Transactions on Automatic Control, Vol.
The heterojunction bipolar transistor (HBT) is a type of bipolar junction transistor (BJT) which uses differing semiconductor materials for the emitter and base regions, creating a heterojunction.
A High-electron-mobility transistor (HEMT), also known as heterostructure FET (HFET) or modulation-doped FET (MODFET), is a field-effect transistor incorporating a junction between two materials with different band gaps (i.e. a heterojunction) as the channel instead of a doped region (as is generally the case for MOSFET).
An IMPATT diode (IMPact ionization Avalanche Transit-Time diode) is a form of high-power semiconductor diode used in high-frequency microwave electronics devices.
An inductor, also called a coil, choke or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it.
Injection locking and injection pulling are the frequency effects that can occur when a harmonic oscillator is disturbed by a second oscillator operating at a nearby frequency.
The Institute of Radio Engineers (IRE) was a professional organization which existed from 1912 until December 31, 1962.
The Institution of Electrical Engineers (IEE, pronounced I-E-E) was a British professional organisation of electronics, electrical, manufacturing, and Information Technology professionals, especially electrical engineers.
An integrating ADC is a type of analog-to-digital converter that converts an unknown input voltage into a digital representation through the use of an integrator.
Irving Langmuir (January 31, 1881 – August 16, 1957) was an American chemist and physicist.
A klystron is a specialized linear-beam vacuum tube, invented in 1937 by American electrical engineers Russell and Sigurd Varian,Pond, Norman H. "The Tube Guys".
An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together.
Lee de Forest (August 26, 1873 – June 30, 1961) was an American inventor, self-described "Father of Radio", and a pioneer in the development of sound-on-film recording used for motion pictures.
In mathematics, in the study of dynamical systems with two-dimensional phase space, a limit cycle is a closed trajectory in phase space having the property that at least one other trajectory spirals into it either as time approaches infinity or as time approaches negative infinity.
A linear circuit is an electronic circuit in which, for a sinusoidal input voltage of frequency f, any steady-state output of the circuit (the current through any component, or the voltage between any two points) is also sinusoidal with frequency f. Note that the output need not be in phase with the input.
In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal.
Low-frequency oscillation (LFO) is an electronic signal which is usually below 20 Hz and creates a rhythmic pulse or sweep.
MESFET stands for metal–semiconductor field-effect transistor.
Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; with frequencies between and.
A mobile phone, known as a cell phone in North America, is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.
A multivibrator is an electronic circuit used to implement a variety of simple two-state devices such as relaxation oscillators, timers and flip-flops.
In electronics, negative resistance (NR) is a property of some electrical circuits and devices in which an increase in voltage across the device's terminals results in a decrease in electric current through it.
In electronics, noise is an unwanted disturbance in an electrical signal.
A numerically controlled oscillator (NCO) is a digital signal generator which creates a synchronous (i.e. clocked), discrete-time, discrete-valued representation of a waveform, usually sinusoidal.
An operational amplifier (often op-amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output.
An opto-electronic oscillator (OEO) is an optoelectronic circuit that produces repetitive electronic sine wave and/or modulated optical continuous wave signals.
Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states.
An oscilloscope, previously called an oscillograph, and informally known as a scope or o-scope, CRO (for cathode-ray oscilloscope), or DSO (for the more modern digital storage oscilloscope), is a type of electronic test instrument that allows observation of varying signal voltages, usually as a two-dimensional plot of one or more signals as a function of time.
A parametric oscillator is a driven harmonic oscillator in which the oscillations are driven by varying some parameter of the system at some frequency, typically different from the natural frequency of the oscillator.
The Pearson–Anson effect, discovered in 1922 by Stephen Oswald Pearson and Horatio Saint George Anson, is the phenomenon of an oscillating electric voltage produced by a neon bulb connected across a capacitor, when a direct current is applied through a resistor.
A phase-locked loop or phase lock loop abbreviated as PLL is a control system that generates an output signal whose phase is related to the phase of an input signal.
A phase-shift oscillator is a linear electronic oscillator circuit that produces a sine wave output.
The Pierce oscillator is a type of electronic oscillator particularly well-suited for use in piezoelectric crystal oscillator circuits.
Piezoelectricity is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress.
In electrical circuit theory, a port is a pair of terminals connecting an electrical network or circuit to an external circuit, a point of entry or exit for electrical energy.
Positive feedback is a process that occurs in a feedback loop in which the effects of a small disturbance on a system include an increase in the magnitude of the perturbation.
A power inverter, or inverter, is an electronic device or circuitry that changes direct current (DC) to alternating current (AC).
In physics and engineering the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is, and characterizes a resonator's bandwidth relative to its centre frequency.
Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2.
A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time.
Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.
In radio communications, a radio receiver (receiver or simply radio) is an electronic device that receives radio waves and converts the information carried by them to a usable form.
Linear electronic oscillator circuits, which generate a sinusoidal output signal, are composed of an amplifier and a frequency selective element, a filter.
A regenerative circuit is an amplifier circuit that employs positive feedback (also known as regeneration); some of the output of the amplifying device is applied to its input without phase inversion, which reinforces the signal, increasing the amplification.
In electronics a relaxation oscillator is a nonlinear electronic oscillator circuit that produces a nonsinusoidal repetitive output signal, such as a triangle wave or square wave.
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.
In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.
A resonator is a device or system that exhibits resonance or resonant behavior, that is, it naturally oscillates at some frequencies, called its resonant frequencies, with greater amplitude than at others.
A ring oscillator is a device composed of an odd number of NOT gates in a ring, whose output oscillates between two voltage levels, representing true and false.
The Robinson oscillator is an electronic oscillator circuit originally devised for use in the field of continuous wave (CW) nuclear magnetic resonance (NMR).
A Royer oscillator is an electronic relaxation oscillator that employs a saturable-core transformer.
The sawtooth wave (or saw wave) is a kind of non-sinusoidal waveform.
In electronics, a Schmitt trigger is a comparator circuit with hysteresis implemented by applying positive feedback to the noninverting input of a comparator or differential amplifier.
In digital circuit theory, sequential logic is a type of logic circuit whose output depends not only on the present value of its input signals but on the sequence of past inputs, the input history.
A signal generator is an electronic device that generates repeating or non-repeating electronic signals in either the analog or the digital domain.
A sine wave or sinusoid is a mathematical curve that describes a smooth periodic oscillation.
A square wave is a non-sinusoidal periodic waveform in which the amplitude alternates at a steady frequency between fixed minimum and maximum values, with the same duration at minimum and maximum.
A surface acoustic wave (SAW) is an acoustic wave traveling along the surface of a material exhibiting elasticity, with an amplitude that typically decays exponentially with depth into the substrate.
A switched-mode power supply (switching-mode power supply, switch-mode power supply, switched power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently.
A synthesizer (often abbreviated as synth, also spelled synthesiser) is an electronic musical instrument that generates electric signals that are converted to sound through instrument amplifiers and loudspeakers or headphones.
Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound.
A television transmitter is a device which broadcasts an electromagnetic signal to the television receivers.
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.
In electronics and telecommunications, a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna.
A tri-tet oscillator is a crystal-controlled vacuum tube electronic oscillator circuit.
A triangle wave is a non-sinusoidal waveform named for its triangular shape.
A triode is an electronic amplifying vacuum tube (or valve in British English) consisting of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate (anode).
A tunnel diode or Esaki diode is a type of semiconductor that is capable of very fast operation, well into the microwave frequency region (up to), made possible by the use of the quantum mechanical effect called tunneling.
A two-port network (a kind of four-terminal network or quadripole) is an electrical network (circuit) or device with two pairs of terminals to connect to external circuits.
Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one decimeter.
A Vackář oscillator is a wide range variable frequency oscillator (VFO) that strives for a near constant output amplitude over its frequency range.
In electronics, a vacuum tube, an electron tube, or just a tube (North America), or valve (Britain and some other regions) is a device that controls electric current between electrodes in an evacuated container.
Valdemar Poulsen (23 November 1869 – 23 July 1942) was a Danish engineer who made significant contributions to early radio technology.
In dynamics, the Van der Pol oscillator is a non-conservative oscillator with non-linear damping.
In electronics, a varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode is a type of diode designed to exploit the voltage-dependent capacitance of a reversed-biased p–n junction.
A video game is an electronic game that involves interaction with a user interface to generate visual feedback on a video device such as a TV screen or computer monitor.
A microwave (12–18nbspGHz) voltage-controlled oscillator A voltage-controlled oscillator (VCO) is an electronic oscillator whose oscillation frequency is controlled by a voltage input.
A waveguide is a structure that guides waves, such as electromagnetic waves or sound, with minimal loss of energy by restricting expansion to one dimension or two.
A Wien bridge oscillator is a type of electronic oscillator that generates sine waves.
William Du Bois Duddell (1 July 1872, Kensington, London – 4 November 1917, Wandsworth, London) was an English physicist and electrical engineer.