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公开(公告)号：US11411567B2
公开(公告)日：2022-08-09
申请号：US17117240
申请日：2020-12-10
Applicant: QUALCOMM INCORPORATED
Inventor： Masoud Moslehi Bajestan , Giovanni Marucci , Dongmin Park , Marco Zanuso , Yiwu Tang
Abstract: A phase-locked loop (PLL) may include a phase-frequency detector (PFD), a phase interpolation (PI)-based sampler, a loop filter, a voltage-controlled oscillator (VCO), and a fractional frequency divider. The PFD output corresponds to a phase error between a reference clock signal and a feedback signal. The PI-based sampler produces a slope signal in response to the PFD output, and adjusts the slope signal in response to a quantization error correction indication. The PI-based sampler also samples the slope signal. The loop filter produces a VCO control signal in response to a sampled slope signal. The VCO control signal controls the VCO frequency. The fractional frequency divider circuit divides the frequency of the VCO output signal and also determines the quantization error correction corresponding to the quantization error introduced by fractional division of the frequency of the VCO output signal.
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公开(公告)号：US10063366B2
公开(公告)日：2018-08-28
申请号：US15269320
申请日：2016-09-19
Applicant: QUALCOMM Incorporated
Inventor： Marco Zanuso , Giovanni Marucci , Tsai-Pi Hung , Francesco Gatta , Bo Sun
CPC classification number: H04L7/0331 , H03L7/08 , H03L7/087 , H03L7/099 , H03L7/113 , H03L7/1974 , H03L7/1976 , H03L2207/06 , H04B1/40 , H04B1/713 , H04B2201/71353 , H04W72/0453
Abstract: A fast frequency hopping implementation in a phase lock loop (PLL) circuit achieves a PLL lock to a new frequency in a very short period of time. In one instant, frequency allocation at a transceiver is changed. In response, a local oscillator frequency hops to a new center frequency based on the changed frequency allocation. The hopping to the new center frequency is based on two-point modulation of a phase locked loop.
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