Session 25-2

A CMOS ΔΣ Fractional-N Frequency Synthesizer with Quantization
Noise Pushing Technique

 

Abstract

A delta-sigma fractional-N frequency synthesizer with a quantization noise pushing technique is implemented in a 0.18um CMOS technology. The in-band phase noise can be lowered by 12 dB, and the out-band phase noise contributed by the delta-sigma modulator can be reduced by more than 15dB with this technique. The power consumption is 26.8mW from a 2V supply.