Communication semiconductor integrated circuit device incorporating a PLL circuit therein
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United States of America Patent
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Issued Date -
Sep 21, 2006
app pub date -
Mar 14, 2006
filing date -
Mar 14, 2005
priority date (Note) -
Abandoned
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Abstract
A communication semiconductor high-frequency IC device includes an offset-PLL transmission circuit. The device does not require an intermediate-frequency voltage controlled oscillator (IFVCO) to generate an intermediate-frequency (IF) signal and can modulate and demodulate transmission and reception signals of desired frequency bands without a complicated frequency division control circuit. An RF-PLL includes an RFVCO to generate a local oscillation signal shared by a transmission circuit and receiving circuit; controllers, capable of dividing a signal by a frequency dividing ratio represented by an integer, as a frequency divider to divide a reference oscillation signal (.phi.ref) and a frequency divider to divide its own oscillation signal (.phi.FB); and a frequency divider to divide a local oscillation signal (.phi.RF) from the RF-PLL to generate an IF signal (.phi.IF) necessary for the transmission circuit. The frequency dividing ratios of the dividers are changed according to a transmission or reception frequency.
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