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A sub-harmonic oscillator using an injection-locked DCO

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4 Author(s)
Kwok-Ching Ho ; Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, China ; Cheong-Fat Chan ; Chiu-Sing Choy ; Kong-Pang Pun

The paper presents a sub-harmonic injection-locked oscillator which consists of a differential comparator and even stages of inverter chain. We demonstrate that the oscillator can injection-lock on to a 1/2 and 1/3 sub-harmonic of the free running frequency signal. The oscillator is designed in a 0.35 μm CMOS technology with a free running frequency of 950 MHz. The locking range is equal to 95 MHz and 42 MHz when the oscillator is locked at 475 MHz (1/2 sub-harmonic) and 316 MHz (1/3 sub-harmonic) respectively.

Published in:

Communications, Circuits and Systems, 2004. ICCCAS 2004. 2004 International Conference on  (Volume:2 )

Date of Conference:

27-29 June 2004