FeedbackInspection.ee140.s11

FeedbackInspection.ee140.s11 - EE 140 ANALOG INTEGRATED...

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Inspection Analysis of Feedback Circuits CTN 4/10/09 1 SPRING 2011 EE 140 ANALOG INTEGRATED CIRCUITS Inspection Analysis of Feedback Circuits A. BACKGROUND A feedback amplifier can be described in terms of the way the feedback network is connected to the basic amplifier. In particular, there are four basic feedback circuit topologies, and these are illustrated in Fig. 1. Note the following from Fig. 1: (1) With series feedback at the input , voltages v i and v fb are algebraically summed. (2) With shunt feedback at the input , currents i i and i fb are algebraically summed. (3) With series feedback at the output , a current i o is sampled. (4) With shunt feedback at the output , a voltage v o is sampled. Included in Fig. 1 are simple examples of each feedback connection, implemented using bipolar transistors. Note the correspondence between each circuit schematic and its associated block dia- gram. To avoid cluttering, all biasing elements have been omitted from these circuits, but it is assumed that all transistors are biased in the forward-active region to yield a high gain basic amplifier in each case.
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FeedbackInspection.ee140.s11 - EE 140 ANALOG INTEGRATED...

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