Amplifier and offset regulating circuit
AssigneeRenesas Electronics Corporation
InventorSouji Sunairi
Life of this patent
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Abstract
An amplifier includes a signal amplification part that outputs an output signal obtained by amplifying an input signal and a common mode voltage VCM of the output signal, and a common mode feedback part that outputs a signal according to a difference between the common mode voltage VCM and a reference potential Vref as a regulation signal SREG. The regulation signal SREG from the common mode feedback part is fed back to a current source of the signal amplification part and a current source of the common mode feedback part.
Claims4
An amplifier that amplifies an input signal to output an output signal, and regulates a central voltage of the output signal according to a reference voltage that is independently and externally input, the amplifier comprising:
- an amplification part that outputs an amplified input signal and the central voltage,
- a first current source supplying an operating current to the amplification part;
- an offset regulating part that outputs a regulation signal according to a difference between the central voltage and the reference voltage;
- a second current source supplying an operating current to the offset regulating part, wherein
- the regulation signal from the offset regulating part is fed back to said first current source and said second current source.
An offset regulating circuit that regulates a central voltage of an output signal output from an amplification part according to a reference voltage that is independently and externally input, comprising;
- an offset regulating part that outputs a regulation signal according to a difference between the central voltage and the reference voltage and
- a current source supplying an operating current to the offset regulating part, wherein the regulation signal from the offset regulating part is fed back to said current source.
Dependencies are inferred from the claim text.