Amplifier with adaptively-controlled local feedback loop

A system comprising:

• a differential amplifier circuit including a first differential amplifier, a first feedback path, and a second feedback path, the first feedback path providing a feedback path from a positive output of the first differential amplifier to a negative input of the first differential amplifier and the second feedback path providing a feedback path from a negative output of the first differential amplifier to a positive input of the first differential amplifier;
• a common mode loop circuit including a second differential amplifier, the common mode loop circuit configured to provide a local feedback loop for the first differential amplifier, and configured to control current flow into the positive input of the first differential amplifier and current flow into the negative input of the first differential amplifier;
• and
• a control circuit coupled with the common mode loop circuit, the control circuit being configured to enable the common mode loop circuit in response to a magnitude of a differential input signal of the differential amplifier exceeding a threshold.

A circuit comprising:

• an input circuit configured to receive a differential input signal;
• a differential amplifier circuit coupled with the input circuit, the differential amplifier circuit including a first differential amplifier, a first feedback path, and a second feedback path, the first feedback path providing a feedback path from a positive output of the first differential amplifier to a negative input of the first differential amplifier and the second feedback path providing a feedback path from a negative output of the first differential amplifier to a positive input of the first differential amplifier;
• a chopper clock circuit configured to output a chopper clock;
• a common mode loop circuit including a second differential amplifier and chopper switches, the common mode loop circuit configured to provide a local feedback loop for the first differential amplifier, the chopper switches configured to receive the chopper clock signal from the chopper clock circuit and configured to control a current flow into the positive input of the first amplifier and into the negative input of the first amplifier;
• and
• a control circuit coupled with the common mode loop circuit, the control circuit being configured to enable the common mode loop circuit in response to a magnitude of the differential input signal exceeding a threshold.