Definition

Noun: A negative feedback circuit is an electronic circuit configuration where a portion of the output signal is returned (fed back) to the input with a phase that opposes the original input signal. This subtraction from the input reduces the overall gain but increases stability, linearity, and bandwidth.

Usage

This term is used in electronics and control systems engineering to describe a fundamental method for stabilizing amplifier performance and system behavior. * The stability of the operational amplifier is ensured by a negative feedback circuit. * Designing a negative feedback circuit requires careful calculation of the feedback factor.

Advanced Usage

• "to apply negative feedback": This verb phrase describes the action of implementing this circuit principle.
  • Engineers apply negative feedback to reduce distortion in audio amplifiers.

Variants and Related Words

• Negative Feedback (n): The general principle or phenomenon of feeding back a signal to subtract from the input.
  • Negative feedback is essential for precise control systems.
• Feedback Loop (n): The complete path of signal from output back to input. A negative feedback circuit creates a specific type of feedback loop.
• Stabilizing Circuit (n): A general term for circuits that improve stability, often achieved through negative feedback.

Synonyms

• Degenerative Feedback Circuit: An older, synonymous term in electronics.
• Stabilizing Feedback Loop: A descriptive synonym emphasizing the circuit's purpose.

Related Concepts (Not Phrasal Verbs or Idioms)

• Closed-loop Gain: The gain of an amplifier system when a feedback circuit, such as a negative feedback circuit, is connected.
• Open-loop Gain: The inherent gain of an amplifier without any feedback circuit applied.
• Positive Feedback Circuit: The opposite concept, where feedback adds to the input, increasing gain but potentially causing instability or oscillation.

Noun

1. a feedback circuit that subtracts from the input