Mobile communication terminal device and variable gain circuit
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United States of America Patent
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Dec 12, 2006
Issued Date -
N/A
app pub date -
Dec 18, 2003
filing date -
Dec 19, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
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).
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