![]() V o u t = A 2 V i n 2 ( R L + R o u t 2 R L ) ![]() Second amplification stage with loss due to R o u t 2 and R L : V i n 2 = A 1 V i n 1 ( R i n 2 + R o u t 1 R i n 2 ) It is necessary to consider what happens when non-ideal amplifiers are put in series. it is clear that the input and output resistances (or impedances) come into play by reducing the overall gain. let us now calculate the gain assuming nothing about the Rin and Rout of each stage, treating them as voltage dividers between the two stages and between the last stage and the output load.įirst amplification stage with loss between stages The sections in this chapter tend to use BJT devices to illustrate the circuit concepts but these multi-stage amplifiers can be constructed from MOS FET devices, or a combination, just as easily and the methods used to analyze them are much the same as well. We have the three basic one transistor amplifier configurations to use as building blocks to create more complex amplifier systems which can provide better optimized specifications and performance.
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