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A digitally tuned 1.1 GHz subharmonic injection-locked VCO in 0.18/spl mu/m CMOS

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3 Author(s)
Ahmed, H. ; Dept. of Electron., Carleton Univ., Ottawa, Ont., Canada ; DeVries, C. ; Mason, R.

In this paper, a second-order digitally controlled oscillator, based on subharmonic injection locking, is presented. The prototype design is implemented in a 0.18 /spl mu/m standard CMOS process. The implemented injection-locked oscillator, with a resonant frequency of 1.1 GHz, provides a low phase noise of -99.7 dBc/Hz at a 50 KHz offset. The oscillator is injection-locked with the eleventh harmonic of a low frequency 100 MHz PLL. Using switched-capacitor banks, the oscillator can be digitally tuned to within 300 KHz of the injection locking frequency which allows it to be locked with an input signal as low as - 53 dBm. The oscillator has an overall tuning range of 20% and together with an input amplifier consumes only 688 /spl mu/W when powered by a single 1.6V supply voltage.

Published in:

Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European

Date of Conference:

16-18 Sept. 2003