期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 51, 期 8, 页码 1878-1889出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2016.2574804
关键词
Calibrator; clock multiplier; frequency-tracking loop (FTL); injection-locked; jitter; phase noise; process-voltage-temperature (PVT); real-time
资金
- Basic Science Research Program through NRF of Korea - Ministry of Science, ICT & Future Planning [NRF-2015R1A1A1A05027276]
- National Research Foundation of Korea [2016H1A2A1909110, 2016H1A2A1909086, 2015R1A1A1A05027276] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A low-jitter, ring-type voltage-controlled oscillator (VCO)-based injection-locked clock multiplier (ILCM) with a continuous frequency-tracking loop (FTL) for process-voltage-temperature (PVT)-calibration is presented. Using a single replica-delay cell of the VCO that provides the intrinsic phase information of the free-running VCO, the proposed FTL can continuously track and correct frequency drifts. Therefore, the proposed ILCM can calibrate real-time frequency drifts due to voltage or temperature variations as well as static frequency deviations due to process variations. Since the FTL provided an additional filtering of in-band VCO noise, the ILCM was able to achieve excellent jitter performance over the PVT variations, while it was based on a ring-VCO. The proposed ILCM was fabricated in a 65 nm CMOS process. When injection locked, the RMS-jitter integrated from 10 kHz to 40 MHz of the 1.20 GHz output signal was 185 fs. The proposed PVT-calibrator regulated the degradations of jitter to less than 5% and 7% over temperatures and supply voltages, respectively. The active area was 0.06 mm(2) and total power consumption was 9.5 mW.
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