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Download P4.4 Consider the following common source JFET amplifier circuit. Notice... it includes an additional bias resistor, R
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Transcript
P4.4 Consider the following common source JFET amplifier circuit. Notice that it includes an additional bias resistor, R1, compared to the usual self-biasing circuit. Assume that transistor achieves the desired transconductance with VGS = – 0.5 V. However, due to design constraints, the voltage drop across RS must be 7.8 V. In this case, the self-biasing approach for VGS cannot work. (a) If VDD = 10.0 V and RG= 1 M , what value of R1 is required to bring VGS to – 0.5 V? (b) Is the input impedance compromised (i.e. smaller) as a result of the additional bias resistor? (c) What is the input impedance with and without the inclusion of R1?
