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A 90-GHz voltage-controlled oscillator with a 2.2-GHz tuning range in a 130-nm CMOS technology

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2 Author(s)
Changhua Cao ; Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA ; O, K.K.

A 90-GHz LC-resonator based voltage-controlled oscillator (VCO) is fabricated in a 130-nm foundry CMOS process. The core transistor structure has been optimized to reduce parasitic capacitances. An accumulation mode MOS varactor has been optimized to achieve Q of ∼7 at 90 GHz or ∼600 at 1 GHz. The VCO is tuned by changing the bias voltage of current source transistor, which modifies the DC bias for core transistors, and that for the varactors to achieve a tuning range of 2.2 GHz. The VCO core consumes 5 to 10.5-mA current from a 1.5-V supply. The phase noise at 10-MHz offset from carrier varies between -104 to -106 dBc/Hz over the tuning range.

Published in:

VLSI Circuits, 2005. Digest of Technical Papers. 2005 Symposium on

Date of Conference:

16-18 June 2005