Semiconductor integrated circuit for communication

Details Semiconductor integrated circuit for communication Semiconductor integrated circuit for communication

2006-02-24

2010-12-07

Vuong, Quochien B (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C455S063100, C455S115100, C455S333000, C375S296000

Reexamination Certificate

active

07848716

ABSTRACT:
The present invention provides a semiconductor integrated circuit for communication (RF IC) realizing high yield without deteriorating a carrier leak characteristic even when a modulation circuit is formed by using cheep parts with large variations. In a semiconductor integrated circuit (RF IC) including: an input circuit constructed by a differential amplifier circuit and a level shifter, which is provided on the ante stage of a mixer of a differential circuit called a Gilbert Cell; and a modulation circuit that performs modulation by adding an I/Q signal and a carrier wave signal, a calibration circuit for canceling a DC offset in an output of the input circuit is provided.

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