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US 2026/0058622 A1Published application
Ripple Reduction Using Chopper Amplifiers
OwnerBoqiang Xiao, Nan Xinginventors
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Abstract
Described embodiments include an apparatus with a first amplifier having first inputs and first outputs. A second amplifier has second inputs and a second output. A first chopper circuit is coupled between third inputs and the first inputs. A second chopper circuit is coupled between the first outputs and the second inputs. A balanced filter is coupled to the second inputs.
Claims20
An apparatus, comprising:
- a first amplifier having first inputs and first outputs;
- a second amplifier having second inputs and a second output;
- a first chopper circuit coupled between third inputs and the first inputs;
- a second chopper circuit coupled between the first outputs and the second inputs;
- and
- a balanced filter coupled to the second inputs.
3 more elements
An apparatus, comprising:
- a chopper circuit having inputs and an output, and including a first chopper and a second chopper;
- a feedforward circuit having inputs coupled to the inputs of the chopper circuit, and having outputs;
- an output circuit having inputs coupled to the output of the chopper circuit and the output of the feedforward circuit;
- and
- a balanced filter coupled to the outputs of the second chopper.
2 more elements
A system, comprising:
- a first amplifier having first inputs and first outputs;
- a first resistor coupled between an input voltage terminal and a first one of the first inputs;
- a second resistor coupled between the first one of the first inputs and a reference voltage terminal;
- a second amplifier having second inputs and a second output;
- a first chopper circuit coupled between third inputs and the first inputs;
- a second chopper circuit coupled between the first outputs and the second inputs;
- a balanced filter coupled to the second inputs;
- a feedback network coupled between the second output of the second amplifier and a second one of the first inputs;
- and
- an analog-to-digital converter (ADC) having an input coupled to the second output of the second amplifier.
7 more elements
Dependencies are inferred from the claim text.