Amplifier circuit and multipath nested miller amplifier circuit
First Claim
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1. An amplifier circuit configured to amplify an input signal, comprising:
- a chopper switching circuit configured to provide a modulated signal of the input signal in one of a positive phase and a negative phase;
a voltage-to-current conversion circuit connected to the chopper switching circuit, and configured to generate an output current according to an output voltage from the chopper switching circuit;
a sampling circuit connected to the voltage-to-current conversion circuit including a pair of capacitors having a same capacitance value, and the sampling circuit configured to;
sample electric charges according to the output current from the voltage-to-current conversion circuit; and
provide a voltage according to an electric charge obtained by one of addition and subtraction of the sampled electric charges across the pair of capacitors; and
a holding circuit connected to the sampling circuit, and configured to hold the voltage output from the sampling circuit.
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Abstract
Provided are an amplifier circuit capable of reducing DC offset voltage without an increase in chip area and degradation in frequency characteristics, and a multipath nested miller amplifier circuit. The amplifier circuit includes a chopper switching circuit, a sampling circuit configured to sample an output signal from the chopper switching circuit, and a holding circuit configured to hold a signal output from the sampling circuit.
6 Citations
4 Claims
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1. An amplifier circuit configured to amplify an input signal, comprising:
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a chopper switching circuit configured to provide a modulated signal of the input signal in one of a positive phase and a negative phase; a voltage-to-current conversion circuit connected to the chopper switching circuit, and configured to generate an output current according to an output voltage from the chopper switching circuit; a sampling circuit connected to the voltage-to-current conversion circuit including a pair of capacitors having a same capacitance value, and the sampling circuit configured to; sample electric charges according to the output current from the voltage-to-current conversion circuit; and provide a voltage according to an electric charge obtained by one of addition and subtraction of the sampled electric charges across the pair of capacitors; and a holding circuit connected to the sampling circuit, and configured to hold the voltage output from the sampling circuit. - View Dependent Claims (2, 3, 4)
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Specification