A 900MHz CMOS PLL/frequency synthesizer using current-adjustable charge-pump circuit and on-chip loop filter with initialization circuit is *** charge-pump current is insensitive to the changes of temperature and powe...
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A 900MHz CMOS PLL/frequency synthesizer using current-adjustable charge-pump circuit and on-chip loop filter with initialization circuit is *** charge-pump current is insensitive to the changes of temperature and power *** value of the charge-pump current can be changed by switches,which are controlled by external *** the performance of the PLL,such as loop bandwidth,can be changed with the change of the charge-pump *** loop filter initialization circuit can speed up the PLL when the power is on.A multi-modulus prescaler is used to fulfill the frequency *** circuit is designed using 0.18μm,1.8V,1P6M standard digital CMOS process.
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