A low noise CMOS frequency synthesizer with dynamic bandwidth control
1994
A low noise 0.8 /spl mu/m CMOS phase locked loop (PLL) with a maximum output frequency of I20 MHz has been developed for a pixel clock generator for a range of computer monitors. Other applications include computer clock generation and disk drives. The synthesizer requires no external components. A low phase noise has been achieved through supply rejection techniques, by placing the oscillator in a high gain feedback loop to minimize its noise contribution, and by dynamically adjusting the PLL bandwidth to maximize the open loop gain. >
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