negative feedback amplifier
E5210
A negative feedback amplifier is an electronic amplifier design that feeds a portion of its output back to its input in opposition to reduce distortion, stabilize gain, and improve overall performance.
Statements (55)
| Predicate | Object |
|---|---|
| instanceOf |
electronic amplifier topology
ⓘ
feedback system ⓘ |
| analyzedBy |
control theory
ⓘ
feedback theory ⓘ small-signal analysis ⓘ |
| appliedIn |
RF amplifiers
ⓘ
audio power amplifiers ⓘ control systems ⓘ instrumentation amplifiers ⓘ operational amplifier circuits ⓘ |
| canBeImplementedWith |
bipolar junction transistor amplifier
ⓘ
field-effect transistor amplifier ⓘ operational amplifier ⓘ vacuum tube amplifier ⓘ |
| hasComponent |
feedback network
ⓘ
forward gain block ⓘ input summing node ⓘ output node ⓘ |
| hasEffect |
can increase low-frequency stability
ⓘ
can shape frequency response ⓘ extends high-frequency response ⓘ reduces effective gain compared to open-loop gain ⓘ reduces noise contribution of active device within loop ⓘ reduces output offset in some designs ⓘ |
| hasFeedbackType |
current-series feedback
ⓘ
current-shunt feedback ⓘ voltage-series feedback ⓘ voltage-shunt feedback ⓘ |
| hasProperty |
improved bias stability
ⓘ
improved repeatability ⓘ potential for oscillation if poorly compensated ⓘ reduced gain variation with temperature ⓘ reduced nonlinear distortion ⓘ reduced sensitivity to parameter variations ⓘ tradeoff between gain and bandwidth ⓘ |
| hasPurpose |
control input impedance
ⓘ
control output impedance ⓘ improve linearity ⓘ improve overall performance ⓘ increase bandwidth ⓘ reduce distortion ⓘ stabilize gain ⓘ |
| relatedTo |
closed-loop control system
ⓘ
positive feedback amplifier ⓘ |
| uses | negative feedback ⓘ |
| usesConcept |
Bode plot
ⓘ
Nyquist stability criterion ⓘ closed-loop gain ⓘ error signal ⓘ feedback factor ⓘ gain margin ⓘ loop gain ⓘ open-loop gain ⓘ phase margin ⓘ stability margin ⓘ |
Referenced by (1)
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