Amplifiers – With periodic switching input-output
Patent
1997-06-10
1999-12-14
Mottola, Steven J.
Amplifiers
With periodic switching input-output
330107, H03F 102, H03F 136
Patent
active
06002299&
ABSTRACT:
An amplifier is disclosed including at least three integrator stages connected to provide a low-frequency path from a signal input to a signal output, and a relatively high-frequency bypass path around the first integrator stage. The first integrator stage uses dynamic offset reduction such as chopper stabilization, and an analog low-pass filter reduces artifacts of the dynamic offset reduction. The paths converge at a current summing node. To prevent instability when the integrators are saturated by large signals, the paths have respective saturation current limits selected so that the relatively high-frequency path is not saturated when the low-frequency path saturates. To ensure that the conditional stability is substantially unaffected by adjustment of closed-loop gain, a current feedback input adjusts the open-loop gain in a fashion inversely proportional to resistance presented to the current feedback input by a feedback circuit.
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Cirrus Logic Inc.
Mottola Steven J.
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