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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(2):483-490; doi:10.1093/ietfec/e91-a.2.483
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Analog Circuit Techniques and Related Topics -- Papers

Automatic Adjustment of Phase Locked Loop Transfer Function

Masahiro YOSHIOKA1 and Nobuo FUJII1

1 The authors are with the Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo, 152-8552 Japan. E-mail: yoshioka{at}ec.ss.titech.ac.jp


  Abstract

This paper presents an automatic adjustment of the transfer function of phase locked loop (PLL). The time constants and the gain factor of the transfer function are adjusted without opening the loop of PLL. The time constant adjustment is performed using a replica of the 1st order RC low pass filter and the gain factor is adjusted by detecting the open loop gain at the unity gain frequency. These adjustments are automatically carried out using a digitally controlled capacitance array and a digitally controlled charge pump. The proposed calibration can reduce the bandwidth error of ±30% to ±5% and the gain error of 7 dB to 1 dB.

Key Words: phase locked loop, gain adjustment, frequency adjustment, automatic calibration

Manuscript received June 15, 2007. Manuscript revised September 10, 2007.


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