Mobile communication terminal device and variable gain circuit

Details Mobile communication terminal device and variable gain circuit Mobile communication terminal device and variable gain circuit

2006-12-12

2006-12-12

Vuong, Quochien B. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S235100, C455S296000, C375S345000, C375S346000

Reexamination Certificate

active

07149487

ABSTRACT:
In receiver systems for cellular phones using the W-CDMA method, the change in DC voltage occurring when the gain of a programmable gain amplifier (PGA circuit) is switched to adjust the gain for a received signal, can be suppressed. A sample-and-hold circuit is installed containing a “sample” mode for directly outputting a signal from the PGA section and also containing a “hold” mode for outputting the electric charge of a specified voltage stored in a capacitor. This sample-and-hold circuit normally operates in “sample” mode so the output signal from the PGA section is directly output, but is operated in “hold” mode at the gain switching timing of the PGA circuit, so that the electric charge of the specified voltage stored in the capacitor is output for a specified length of time (equal to the time required for the DC voltage change to converge to a stable level).

REFERENCES:
patent: 5196806 (1993-03-01), Ichihara
patent: 5220219 (1993-06-01), Barber
patent: 5831456 (1998-11-01), Sutardja
patent: 6055118 (2000-04-01), Du
patent: 6420934 (2002-07-01), Butler et al.
patent: 2002/0127990 (2002-09-01), Bollenbeck
patent: 2004/0116092 (2004-06-01), Hessel et al.
patent: 2004/0119290 (2004-06-01), Dietz et al.

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