We must build a filter to separate the difference frequency in problem 1 (6.72kH

Question

We must build a filter to separate the difference frequency in problem 1 (6.72kHz), from the sum

frequency, which is much higher. A good cutoff for this low-pass would be 20kHz. In the following low

pass circuit, Vs=10V and R=150?

a) What capacitor value would give us our desired cutoff frequency, where ?=1/(RC)?

b) Graph the impedance vs frequency of the capacitor at f=200Hz, 2kHz, 20kHz, 200kHz, and 2MHz.

We must build a filter to separate the difference frequency in problem 1 (6.72kHz), from the sum frequency, which is much higher. A good cutoff for this low-pass would be 20kHz. In the following low pass circuit, Vs=10V and R=150? What capacitor value would give us our desired cutoff frequency, where ?=1/(RC)? Graph the impedance vs frequency of the capacitor at f=200Hz, 2kHz, 20kHz, 200kHz, and 2MHz. Below is the circuit

Explanation / Answer

a) cutoff frequency fc =1/(2pi*RC)=20k

C= 1/(2pi*150*20k) = 53.05 nF

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