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, gmo
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
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