Abstract
A 3.5 times PLL clock frequency multiplier for low voltage different signal (LVDS) driver is presented. A novel adaptive charge pump can automatically switch the loop bandwidth and a voltage-controlled oscillator (VCO) is designed with the aid of frequency ranges reuse technology. The circuit is implemented using 1st Silicon 0.25 μm mixed-signal complementary metal-oxide-semiconductor (CMOS) process. Simulation results show that the PLL clock frequency multiplier has very low phase noise and very short capture time.
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