13.5. Shunt – Series Cascade Amplifier
The cascading of two common-source amplifier stages will now be explored. This will expand the discussion on feedback amplifiers to include the shunt – series (current) amplifier. As shown in Fig. 13.5, the current Io is sensed, with the feedback network consisting of RS2 and Rf, and a fraction of Io is summed at the gate input node along with the input source current. Gate resistor RG1 provides for an addition bias design variable but otherwise is simply combined with the source resistance, Rs, in the amplifier performance analysis or design.
Figure 13.5. Shunt-series feedback amplifier. This is a current amplifier with feedback amplifier gain, Ai = Io/Ii.
13.5.1. DC Design
For the design, assume ...
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