Communication semiconductor integrated circuit,...

Details Communication semiconductor integrated circuit,... Communication semiconductor integrated circuit,...

2006-03-09

2008-12-09

Vuong, Quochien B (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S126000, C455S127200

Reexamination Certificate

active

07463876

ABSTRACT:
A communication semiconductor integrated circuit includes a phase control loop and an amplitude control loop. A gain of a variable gain amplifier when it is detected from an output of the comparator that the amplitudes of the reference signal and the feedback signal are equal to each other while a predetermined DC voltage is applied to an amplifier which amplifies an output of a transmission oscillation circuit and is controlled by the amplitude control loop to vary the gain of the variable gain amplifier on a feedback path is held in a register. Thereafter, the DC voltage is changed to another value to detect the gain of the variable gain amplifier, so that the gain of a variable gain amplifier on the forward path is decided on the basis of the detected gain and the gain held in the register.

REFERENCES:
patent: 7082290 (2006-07-01), Takano et al.
patent: 7132900 (2006-11-01), Yahagi et al.
patent: 7366481 (2008-04-01), Okada et al.
patent: 2004/0012441 (2004-01-01), Mackey et al.
patent: 0212725.6 (2002-05-01), None
patent: 2389251 (2003-12-01), None
patent: 2393595 (2004-03-01), None
patent: 2390495 (2004-07-01), None
patent: 0504875.6 (2005-03-01), None
patent: 2004/042919 (2004-05-01), None

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