30_MC_HYBRID_GAIN_CONTROL

Published:2009/7/16 2:24:00 Author:Jessie | From:SeekIC

Q2 acts as variable impedance to give emitter degeneration, which is a form of external gain control. Q2 also controls collector current of Q1 to give reverse gain control action, which is internal gain control. Gain control range is 33 db, with 2:1 change in bandwidth.-Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N.Y., 1966, p 222.



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