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US 10,951,181 B2Granted
Methods and apparatus for an amplifier circuit
AssigneeSemiconductor Components Industries, LLC
InventorAkinobu Onishi
Life of this patent
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Abstract
Various embodiments of the present technology may comprise methods and apparatus for an amplifier circuit. Methods and apparatus for an amplifier circuit according to various aspects of the present invention may be utilized in a digital-to-analog converter. The amplifier circuit may comprise a first operational amplifier with a feedback circuit. The feedback circuit may comprise an inverting amplifier circuit.
Claims20
An integrated circuit, comprising:
- a first operational amplifier (op-amp) comprising:
- a non-inverting input terminal;
- an inverting input terminal;
- and
- an output terminal;
- and
- a inverting amplifier circuit connected to the first operational amplifier and comprising:
- a second operational amplifier (op-amp) comprising:
- an inverting input terminal connected to the output terminal of the first operational amplifier;
- and
- an output terminal connected to the non-inverting terminal of the first operational amplifier;
- and
- at least one of a first resistor and a first capacitor, wherein the at least one of the resistor and the capacitor is connected between the output terminal of the second operational amplifier and the inverting terminal of the second operational amplifier.
10 more elements
A method for removing distortion in an output signal of a digital-to-analog converter (DAC), comprising:
- reducing an amplitude of a first input signal at an inverting terminal of a first operational amplifier (op-amp) comprising:
- generating a first feedback signal according to an output signal of the first op-amp;
- and
- transmitting the first feedback signal to the inverting terminal of the first op-amp;
- and
- reducing an amplitude of a second input signal at a non-inverting terminal of the first op-amp comprising:
- generating, with an inverting amplifier circuit, a second feedback signal according to the output signal of the first op-amp;
- and
- transmitting the second feedback signal to the non-inverting terminal of the first op-amp.
6 more elements
An audio system, comprising:
- an integrated circuit configured to receive a first analog input signal, and comprising:
- processing circuitry configured to convert the first analog input signal into a digital signal;
- and
- a digital-to-analog converter connected to the processing circuitry and comprising:
- a digital circuit configured to process the digital signal;
- and
- an analog circuit connected to an output terminal of the digital circuit, and comprising:
- a switched-capacitor circuit;
- and
- a output buffer comprising:
- a first operational amplifier comprising:
- a non-inverting input terminal;
- an inverting input terminal;
- and
- an output terminal to transmit a second analog signal;
- and
- a second operational amplifier comprising:
- an inverting input terminal connected to the output terminal of the first operational amplifier;
- and
- an output terminal connected to the non-inverting terminal of the first operational amplifier;
- a power amplifier connected to an output terminal of the output buffer and configured to increase a gain of the second analog signal;
- and
- a speaker in communication with the amplifier and responsive to the second analog signal.
20 more elements
Dependencies are inferred from the claim text.