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A 900-MHz CMOS low-phase-noise voltage-controlled ring oscillator

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2 Author(s)
Yan, W.S.T. ; Electr. & Electron. Eng. Dept., Maxim Integrated Products, Sunnyvale, CA, USA ; Luong, H.C.

A 900-MHz two-stage CMOS voltage-controlled ring oscillator (VCO) with good phase-noise performance is presented. Implemented in a 0.5-μm CMOS technology and at 2.5-V supply voltage, the VCO has a wide operating frequency range from 661.5 MHz to 1.27 GHz with a peak VCO gain (KVCO) of -630 MHz/V. At 900 MHz, the phase noise of the VCO is -105.5 dBc/Hz at 600-kHz frequency offset with low power consumption of 15.4 mW. The gain and phase mismatches are less than 0.25 dB and 0.5°, respectively, which corresponds to an image rejection of better than 31 dB. The chip area is only 125×102 μm2

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:48 ,  Issue: 2 )