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US 8,134,255 B2Granted
Noise cancellation circuit, analog signal processing circuit, and electronic instrument
AssigneeSeiko Epson Corporation
InventorsKoichi Hatanaka, Kazumi Matsumoto
Life of this patent
Estimating the term…
Abstract
A cancellation signal generation section generates a cancellation signal which cancels an alternating-current component of a power supply terminal voltage of a digital signal processing circuit section, and a synthesis section synthesizes the generated cancellation signal and a power supply voltage of an analog signal processing circuit section to cancel noise superimposed on the power supply voltage.
Claims5
A noise cancellation circuit comprising:
- a cancellation signal generation section that generates a cancellation signal using a power supply terminal voltage that is supplied to a baseband process circuit section and a RF receiver circuit section with a common power supply line, the cancellation signal canceling a first alternating-current component of the power supply terminal voltage from a power supply section and a second alternating-current component of the power supply terminal voltage from the baseband process circuit section;
- and
- a synthesis section that synthesizes the cancellation signal and the power supply voltage.
Dependencies are inferred from the claim text.