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In this paper, a 57.1-59 GHz fractional-N frequency synthesizer has been fabricated in 90 nm CMOS technology. A magnetic-coupled VCO achieves the high oscillation frequency and low phase noise. A harmonic-locked PD and a multi-modulus prescaler are adopted to double the sampling frequency of a second-order delta-sigma modulator. Theoretically, the quantization noise is improved by 12 dB with the same...
A finite-modulo fractional-N PLL utilizing a low-bit high-order DeltaSigma modulator is presented. A 4-bit 4th-order DeltaSigma modulator performs deterministic 16-modulo fractional-N operation with less spur generation and negligible quantization noise. Further spur reduction is achieved by charge compensation in the voltage domain and phase interpolation in the time domain, which significantly relaxes...
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