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US 2014/0232456 A1Published application
Fast-Settling Capacitive-Coupled Amplifiers
AssigneeMaxim Integrated Products, Inc.
InventorsJohan Hendrik Huijsing, Qinwen Fan, Kofi Afolabi Anthony Makinwa, Daihong Fu, Jun Wu, Lixia Zhou
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Abstract
Fast-settling capacitive-coupled amplifiers are disclosed. The amplifiers use two Capacitive Coupled paths embedded in a Multipath Hybrid Nested Miller Compensation topology. One path is a direct high frequency path and the other path is a slower stabilization path. This combination results in a flat frequency response to and through the chopper frequency, and a fast settling response. Various exemplary embodiments are disclosed, including operational amplifier and instrumentation amplifier configurations.
Claims31
A differential amplifier system comprising:
- a first differential amplifier coupled to a differential amplifier system output, the first differential amplifier being capacitively coupled to a differential amplifier system input;
- and
- a chopper signal path between the differential amplifier system input and the differential amplifier system output, the chopper signal path having a first chopper having an input coupled to the differential amplifier system input and an output capacitively coupled to an input of a second chopper, the output of the second chopper being coupled through an integrator to the differential amplifier system output.
A differential amplifier system comprising:
- a first chopper having an input coupled to a differential amplifier system input;
- a first differential amplifier having an input capacitively coupled to an output of the first chopper;
- a second chopper having an input coupled to an output of the first differential amplifier;
- an output of the second chopper being coupled to a differential amplifier system output;
- a third chopper having an input capacitively coupled to the differential amplifier system input;
- an output of the third chopper being coupled as an input to an integrator;
- and
- an output of the integrator being coupled to the input of the second chopper.
5 more elements
A differential amplifier system comprising:
- a differential amplifier system input;
- a first differential amplification path, the first differential amplification path being capacitively coupled to the differential amplifier system input, the first amplification path being coupled through a first differential amplifier to a differential amplifier system output, the first differential amplifier having at least first and second first differential amplifier stages;
- a second differential amplification path, the second differential amplification path being coupled to the differential amplifier system input through a first chopper, an output of the first chopper being capacitively coupled to an input of a second differential amplifier, the output of the second differential amplifier being coupled to a second chopper, an output of the second chopper being coupled to the input of an integrator, the output of the integrator being coupled to the input of a third differential amplifier, the output of the third differential amplifier being coupled to the input of the second stage of the first differential amplifier, the differential amplifier system having hybrid-nested Miller compensation.
A differential amplifier system comprising:
- a differential amplifier system input;
- a first differential amplification path, the first differential amplification path having a first chopper coupled to the differential amplifier system input, the first chopper having a differential output capacitively coupled to a first differential amplifier, the first differential amplifier having a differential output coupled to a second chopper, the second chopper having a differential output coupled through a second differential amplifier to a differential amplifier system output;
- a second differential amplification path having a third differential amplifier having an input capacitively coupled to the differential amplifier system input and an output coupled to a third chopper, the third chopper having an output coupled to the input of an integrator, the integrator having an output coupled to the input of a fourth differential amplifier, the fourth differential amplifier having an output coupled to a differential input of the second chopper, the differential amplifier system having hybrid-nested Miller compensation.
Dependencies are inferred from the claim text.