A 8 Phases 192MHz crystal-less clock generator with PVT calibration

Ting Chou Lu, Ming-Dou Ker, Hsiao-Wen Zan, Jen Chieh Liu, Yu Lee

Research output: Contribution to journalArticlepeer-review


A multi-phase crystal-less clock generator (MPCLCG) with a process-voltage-temperature (PVT) calibration circuit is proposed. It operates at 192 MHz with 8 phases outputs, and is implemented as a 0.18 μm CMOS process for digital power management systems. A tem- perature calibrated circuit is proposed to align operational frequency under process and supply voltage variations. It occupies an area of 65 μm 75 μm and consumes 1.1mW with the power supply of 1.8V. Temperature coefficient (TC) is 69.5 ppm/°C from 0 to 100°C, and 2-point calibration is applied to calibrate PVT variation. The measured period jitter is a 4.58- ps RMS jitter and a 34.55-ps peak-to-peak jitter (P2P jitter) at 192MHz within 12.67k-hits. At 192 MHz, it shows a 1-MHz-offset phase noise of 102 dBc/Hz. Phase to phase errors and duty cycle errors are less than 5.5% and 4.3%, respectively.

Original languageEnglish
Pages (from-to)275-282
Number of pages8
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Issue number1
StatePublished - 1 Jan 2017


  • Crystal-less clock generator
  • Digital power application
  • Multi-phase output
  • Process
  • Voltage and temperature (PVT) calibration


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