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A circuit which is stable for certain values of input signal and gain, and unstable for other values.



Related Terms

GROUNDED-GRID AMPLIFIER

An electrontube amplifier circuit in which the control grid is at ground potential at the operating frequency; the input signal is applied between cathode and ground, and the output load is connected between anode and ground.

GATE

A circuit which has two or more input-signal ports and which delivers an output only if and when every input signal port is simultaneously energized. circuit; passive AND gate.

DISTORTION

  1. Any undesired change in the waveform of an electric signal passing through a circuit or other transmission medium.
  2. In general, the extent to which a system fails to accurately reproduce the characteristics of an input signal at its output.
  3. Any undesired change in the waveform of a sound wave.

NOT CIRCUIT

A logic circuit with one input and one output that inverts the input signal at the output; that is, the output signal is a logical 1 if the input signal is a logical 0, and vice versa. Also known as inverter circuit.

GROUNDED-GRID-TRIODE CIRCUIT

Circuit in which the input signal is applied to the cathode and the output is taken from the plate; the grid is at radio-frequency ground and serves as a screen between the input and output circuits.

COMMON-DRAIN AMPLIFIER

An amplifier using a field-effect transistor so that the input signal is injected between gate and drain, while the output is taken between the source and drain. Also known as source-follower amplifier.

BOOTSTRAP CIRCUIT

A single-stage amplifier in which the output load is connected between the negative end of the anode supply and the cathode, while signal voltage is applied between grid and cathode; a change in grid voltage changes the input signal voltage with respect to ground by an amount equal to the output signal voltage.

BRIDGING AMPLIFIER

Amplifier with an input impedance sufficiently high so that its input may be bridged across a circuit without substantially affecting the signal level of the circuit across which it is bridged.

OPTICAL AMPLIFIER

An optoelectronic amplifier in which the electric input signal is converted to light, amplified as light, then converted back to an electric signal for the output.

AMPLIFIER

A device which enables an input signal to control power from a source independent of the signal and thus be capable of delivering an output which is greater than the input signal.

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