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A hybrid fractional-N frequency synthesizer with noise filtering technique for wireless application is implemented with TSMC 0.18 μm CMOS process. In order to reduce the effects of high order delta-sigma modulator (Δ ∑M), and suppress the out-of-band quantization noise, a noise filter is adopted. An integer-N phase-locked loop acts as the noise filter in the feedback path of a fractional-N frequency...
A 5.2 GHz phase-locked loop (PLL) frequency synthesizer is implemented in TSMC 0.18 um CMOS process. The main features include the uses of a gate-to-source feedback Colpitts voltage-controlled oscillator (VCO) to lower phase noise, and an off-chip tunable low-pass filter to compensate the variations of resistance R and capacitance C to speed locking time and reduce chip area. At the supply voltage...
A TSMC 0.35 um CMOS 2P4M process PLL (phase-locked loop) for ISM band applications is proposed. The PLL, with a crossed-coupled pMOS ring-oscillator VCO, is realized without using any inductor. Measurement results show that at the supply voltage of 3.3 V and the lowest reference frequency of 25 MHz, the locking range is from 1.8 GHz to 3.29 GHz, locking time is less than 3 us and the phase noise is...
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