QUESTION 1 A. (ro1lRin2 B. Rgd1 C. R\'L D. ro2 Match the small-signal resistance

Question

QUESTION 1 A. (ro1lRin2 B. Rgd1 C. R'L D. ro2 Match the small-signal resistance with the capacitance for the open-circuit time constants method to determine fH for the cascode amplifien - Cgsi Cgd1 SI F. ro1 G. (RLIRo) H. Rd1 I. RL QUESTION 2 Match the small-signal resistance with the capacitance for the open-circuit time constants method to determine fH for the common-drain amplifier A. (RLIlroll(1/gm) C. (roll( 1 /gm)) D. Rsig E. RL F. R'L G. (Rsig R19m R'L) H. (rollRsig C ICL QUESTION 3 Which amplifiers have wide bandwidth? A. cascode B. common-drain C. common-source D. common-gate

Explanation / Answer

Question 1: Cgs = Rsig, Cgd1 = Rgd1, Cdb1 + Cgs2 = Rd1, CL+ Cgd2 = RL || Ro

Question 2: Cgd = Rsig, Cgs = (Rsig + RL') / (1 + gmRL'), CL = (ro || 1/gm)

Question 3: Cascode amplifiers have wide bandwidth

Question 4: Cascode amplifiers have higher gain

Question 5: Except for common gate amplifier the other three amplifiers have high input resistance

Question 6: Common drain has low output resistance

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