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AUTO-CORRECTION FEEDBACK LOOP FOR OFFSET AND RIPPLE SUPPRESSION IN A CHOPPER-STABILIZED AMPLIFIER
AUTO-CORRECTION FEEDBACK LOOP FOR OFFSET AND RIPPLE SUPPRESSION IN A CHOPPER-STABILIZED AMPLIFIER
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机译:斩波稳定放大器中的偏移和纹波抑制的自动校正反馈环
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摘要
A chopper-stabilized amplifier includes a main signal path having first and second chopping circuits at the inputs and outputs of a transconductance amplifier, and an auto-correction feedback loop. The feedback loop includes a transconductance amplifier connected to amplify the chopped output from the main signal path, a third chopping circuit which chops the amplified output, a filter which filters the chopped output to substantially reduce any offset voltage-induced AC component present in the signal being filtered, and a transconductance amplifier which receives the filtered output and produces an output which is coupled back into the main signal path. When properly arranged, the auto-correction feedback loop operates to suppress transconductance amplifier-related offset voltages and offset voltage-induced ripple that might otherwise be present in the amplifier's output.
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