Three JFET amplifiers are shown in Figure P2.10. A “grounded-source” amplifier is shown in Figure…

Three JFET amplifiers are shown in Figure P2.10. A “grounded-source” amplifier is shown in Figure P2.10a. The source resistor, _S, is bypassed by CS, making the source node at small-signal ground. _S is required for self-bias of the JFET. The same JFET is used in all three circuits in which: _DSS  6.0 mA, _P  −3.0 V, g_mo  4 × 10⁻³ Siemens. In circuits A and B, find g _mQ, _S and _D so _DQ = 3.0 mA, and _DQ  8.0 V. Give _DSQ. Circuit C is a source-follower. Find ₁, and _S required to make _DQ  3.0 mA, and _SQ  8.0 V. Neglect gate leakage current.

Figure P2.10a