Amplifiers – With periodic switching input-output
Patent
1999-10-28
2000-10-31
Pascal, Robert
Amplifiers
With periodic switching input-output
330253, 327307, H03F 102, H03F 345, H03L 500
Patent
active
061408727
ABSTRACT:
An offset-compensated amplifier including an input stage (2) having a current source (10), first (11) and second (12) FETs each having a source connected to the current source, first (17) and second (18) input FETs each having a source connected to a drain of the first compensation FET (11), and third (19) and fourth (20) input FETs each having a source connected to a drain of the second compensation FET (12), a drain of each of the first (17) and third (19) input FETs being connected by a first output conductor (21) to a first load (23), and a drain of each of the second (18) and fourth (20) input FETs being connected by a second output conductor (22) to a second load (24), a gate of each of the first (17) and third (19) input FETs being connected to a first input (3A), a gate of each of the second (18) and fourth (20) FETs being connected to a second input (3B). Auto-zeroing circuitry (3) including switching circuitry (32A, 32B) operative to short-circuit the first (3A) and second (3B) inputs to cause the input stage (2) to produce a gained-up offset voltage between the first (21) and second (22) output conductors, switched capacitor circuitry (26A, 26B, 27A, 27B) operative to store the gained-up offset voltage, and compensation circuitry (28) operative to apply compensation signals to the gates of the first (11) and second (12) compensation FETs in response to the stored gained-up offset voltage.
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Burr-Brown Corporation
Nguyen Patricia T.
Pascal Robert
LandOfFree
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