High speed linear variable gain amplifier architecture
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United States of America Patent
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Apr 27, 2004
Grant Date -
Jun 12, 2003
app pub date -
Dec 10, 2001
filing date -
Dec 10, 2001
priority date (Note) -
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Abstract
A two stage amplifier circuit (10), the first stage (12) comprising a modified quad configuration and the second stage (14) comprising a translinear current amplifier configuration. The present invention achieves the advantages of fast response time, low distortion and improved bandwidth. The current gain of the second stage is represented by: (IA.sub.out1 -IA.sub.out2)/(I.sub.out1 -I.sub.out2)=(1+R.sub.123 /R.sub.124).multidot.(I.sub.135 /I.sub.134).multidot.(A/(1+A)) where A=g.sub.mQ109.multidot.R.sub.124.
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