CPC H03F 3/393 (2013.01) [G05F 1/461 (2013.01); G05F 1/468 (2013.01); H03F 2200/168 (2013.01)] | 20 Claims |
1. An apparatus, comprising:
a chopper amplifier comprising an operational amplifier and a notch filter, the notch filter to be operated by a chopping pulse and configured to:
receive as input, an output of the operational amplifier; and
produce a chopper amplifier output that is provided as a feedback signal to an inverting input of the operational amplifier;
a chopping delay switch connected to a first branch of the notch filter having a first capacitor, and connected to a second branch of the notch filter having a second capacitor; and
a control circuit configured to:
close the chopping delay switch to short-circuit the first branch and the second branch of the notch filter to each other;
detect establishment of the feedback signal at the chopper amplifier; and
in response to detecting the establishment of the feedback signal at the chopper amplifier, open the chopping delay switch.
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