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A circuit used to eliminate effects of amplifier gain instability in an indirect-acting recording instrument, in which the voltage input (error signal) to an amplifier is the difference between the measured quantity and the voltage drop across a resistor.



Related Terms

DIFFERENTIAL FREQUENCY METER

A circuit that converts the absolute frequency difference between two input signals to a linearly proportional direct-current output voltage that can be used to drive a meter, recorder, oscilloscope, or other device.

DIAMOND CIRCUIT

A gate circuit that provides isolation between input and output terminals in its off state, by operating transistors in their cutoff region; in the on state the output voltage follows the input voltage as required for gating both analog and digital signals, while the transistors provide current gain to supply output current on demand.

COMMON-MODE REJECTION RATIO

CMRR - the ratio of the gain of an amplifier for difference signals between the input terminals, to the gain for the average or common-mode signal component.

VOLTAGE DROP

The voltage drop around a circuit including wiring and loads must equal the supply voltage.

NOR CIRCUIT

A circuit in which output voltage appears only when signal is absent from all of its input terminals.

COMPARATOR CIRCUIT

An electronic circuit that produces an output voltage or current whenever two input levels simultaneously satisfy predetermined amplitude requirements; may be linear (continuous) or digital (discrete).

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.

AVALANCHE DIODE

A semiconductor breakdown diode, usually made of silicon, in which avalanche breakdown occurs across the entire pn junction and voltage drop is then essentially constant and independent of current; the two most important types are IMPATT and TRAPATT diodes.

OFFSET VOLTAGE

The differential input voltage that must be applied to an operational amplifier to return the zero-frequency output voltage to zero volts, due to device mismatching at the input stage.

PHASE SPLITTER

A circuit that takes a single input alternating voltage and produces two or more output alternating voltages that differ in phase from one another.

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