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A transmitter for rotational spectroscopy using a fractional-N PLL (FNPLL) that generates frequency shift keyed signals from 85 to 127 GHz (39% tuning range) with a fine frequency step of ∼570 Hz and settling time of ∼10 μS is demonstrated. Implemented in 65-nm CMOS, the FNPLL delivers greater than 5 μW of output power, and achieves measured phase noise of less than −70 dBc/Hz in-band and less than...
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 to dBc/Hz. The oscillator...
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