Decreasing Distortion with FeedbackThe use of negative feedback can discriminate against sources of noise or distortion within an amplifier. Considering a two-stage amplifer (after Simpson) with sources of distortion vd1 and vd2 inside the feedback loop. Distortion reduction takes the form below for this amplifier, showing that distortion within the feedback loop is discriminated against, with more reduction of distortion which arises near the output.
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Index Electronics concepts Feedback concepts Reference Simpson Sec 7.2 | ||
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Increasing the BandwidthAmplifier gain will generally decrease at higher frequencies, but the contribution of negative feedback in stabilizing voltage gain and making it nearly independent of the open-loop gain is a major contribution to extending the useful frequency range of amplifiers.
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Index Electronics concepts Feedback concepts Reference Simpson Sec 7.2 | ||||||
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