12
Feedback in Amplifiers
12.1 Introduction
The effects of feedback were first observed when devices were used beyond frequencies for which they were designed and fabricated. A part of the output signal was observed to be present across the input terminals of the device through its inter-lead capacitance. Hence, intentionally or unintentionally the importance of feedback came into being. In RC coupled amplifier a small value of resistance in the emitter lead and between collector to base working as negative feedback stabilizes the quiescent point but reduces the gain.
The word feedback gives an impression that at least some portion of the output voltage is fed back to its input again in any electronic amplifier/ circuit. If the feedback voltage ...
Get Electronic Devices and Integrated Circuits now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
