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Question 18.1: One application for Fig. 18-6 is in a squelch circuit. This ...

One application for Fig. 18-6 is in a squelch circuit. This kind of circuit is used in communication receivers to reduce listener fatigue by having a low voltage gain when no signal is being received. This way, the user does not have to listen to static when there is no communication signal. When a signal comes in, the voltage gain is switched to high.

If R_1 = 100 kΩ, R_f = 100 kΩ, and R_2 = 1 kΩ in Fig. 18-6, what is the voltage gain when the JFET is on? What is the voltage gain when the JFET is off? Explain how the circuit can be used as part of a squelch circuit.

18.6
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Verified Answer:

Using the values and equations of Fig. 18-32, the ...