The ac schematics of a common-source stage and a common-source€“common-gate (cascode) stage are shown in Fig. 7.43 with R_S= 10 kΩ and R_L= 20 kΩ. Using the transistor and operating-point data in Problem 7.2:

(a) Calculate the low-frequency, small-signal voltage gain Ï…_o/Ï…_i for each circuit.

(b) Use the zero-value time-constant method to calculate and compare the ˆ’3-dB frequencies of the gain of the two circuits.

Fig. 7.43:

Transcribed Image Text:

M2 Rs Rs M1 R13 M1 R1 Vi V; (a) (b)