Adaptive loop gain control circuit for voltage controlled oscillator
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United States of America Patent
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Dec 21, 2004
Grant Date -
Oct 23, 2003
app pub date -
Apr 9, 2003
filing date -
Apr 19, 2002
priority date (Note) -
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Abstract
There is provided an adaptive loop gain control circuit for a voltage-controlled oscillator (VCO). The adaptive loop gain control circuit for a voltage-controlled oscillator (VCO) includes a detected voltage generating unit which generates a detected voltage signal according to changes in an operating voltage and an operating temperature, and a control circuit unit which outputs an oscillation control current signal according to the detected voltage signal and an input control voltage signal. The adaptive loop gain control circuit for a voltage-controlled oscillator (VCO) compensates for an oscillation control current according to changes in operating voltage and temperature and compensates for the gain of a phase locked loop (PLL) system, thereby ensuring high operating stability in the PLL circuit.
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