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Chapter 6

Q. 6.12

Apply Miller’s approximation to the above circuit if C_L = 0.

Step-by-Step

Verified Solution

As illustrated in Fig. 6.25, the low-frequency gain from the gate to the source is equal to (1/g_{mb})/[(1/g_m) + (1/g_{mb})] = g_m/(g_m+g_{mb}). The Miller multiplication of C_{GS} at the input is thus equal to C_{GS}[1−g_m/(g_m+g_{mb})] = C_{GS} g_{mb}/(g_{m} + g_{mb}).

6.25