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This paper describes a method to control the zeroes in the frequency response of hybrid finite impulse response (FIR) filter in SigmaDelta fractional-N PLL for quantization noise reduction. By adjusting the current allocation in different branches of the charge pump, transfer function of the FIR filter can be customized to meet various system requirements. Simulation results shows that the proposed...
This paper describes a noise filtering method for quantization noise reduction that is not sensitive to PVT variations. The resulting fractional-N PLL clock generator is the first one demonstrated with an oversampling ratio (OSR) of about 10.
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