ADJUSTABLE_GAIN_WIDEBAND_AMPLIFIER

Published:2009/7/8 21:58:00 Author:May | From:SeekIC

Single resistor R8 adjusts gain from less than1 to over 1000, with gain value equal to 200,000 divided by value in ohms used for R8 Commonmode rejection ratio is about 100 dB, independent of gain. Q1-Q2 are operated open-loop as floating differential input stage. Current sources Q3 and Q4 set operating current of input transistors.- Linear Applications, Vol.2, National Semiconductor, Santa Clara, CA, 1976, LB-21.



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