Common mode feedback bias for low voltage opamps
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United States of America Patent
Stats
-
May 14, 2002
Grant Date -
Feb 28, 2002
app pub date -
Aug 17, 2001
filing date -
Aug 23, 2000
priority date (Note) -
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Abstract
The opamp with common mode feedback bias includes: a first differential pair M1 and M2 having first and second inputs; active load devices M3 and M4 coupled to the first differential pair M1 and M2; a common mode feedback circuit 20 coupled to the active load devices M3 and M4 for controlling the active load devices M3 and M4; a second differential pair M18 and M19 having a first input coupled to the first input of the first differential pair M1 and M2 and a second input coupled to the second input of the first differential pair M1 and M2; and current drivers M22 and M23 having control nodes coupled to the second differential pair M18 and M19 and outputs coupled to the active load devices M3 and M4.
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