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21.5-to-33.4 GHz Voltage-Controlled Oscillator Using NMOS Switched Inductors in CMOS

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3 Author(s)
Jing Zhang ; Electr. Eng. Dept., Univ. of Texas at Dallas, Richardson, TX, USA ; Sharma, N. ; O, K.K.

To demonstrate the applicability of NMOS switched variable inductors in the millimeter wave frequencies, a 21.5 to 33.4 GHz wide tuning range LC voltage-controlled oscillator (LC-VCO) with frequency tunable output buffers that uses variable inductors is reported. The measured phase noise at 10 MHz offset of VCO fabricated in a 65 nm bulk CMOS process varies from -117 to -109 dBc/Hz. The oscillator core consumes 4 or 6 mA from a 1.2 V power supply. These correspond to a record 43.3% tuning range. FOMT ranges from -191.7 to -181.9 dBc/Hz. With tunable output buffers, the measured signal output power is above -15 dBm across the entire frequencies.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:24 ,  Issue: 7 )