A 45-mu W, 162.1-dBc/Hz FoM, 490-MHz Two-Stage Differential Ring VCO Without a Cross-Coupled Latch

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An ultra-low-power, start-up and phase noise performance improved 2-stage differential ring voltage-controlled oscillator (VCO) is proposed. The proposed delay cell architecture reduces power consumption by eliminating the cross-coupling latch of the conventional ring VCO. Instead of the latch, the inverters in the proposed delay cell produce negative conductance by insertion of an additional RC network, which improves the start-up performance of the proposed VCO. The proposed delay cell architecture also improves the phase noise performance of the VCO as it sharpens the drain current of the inverter stage such that it resembles an impulse waveform, which reduces the root-mean-square value of impulse sensitivity function. Implemented in a 65-nm CMOS technology, the measured phase noise of the proposed VCO at 1 MHz offset is -94.84 dBc/Hz at 490 MHz oscillation frequency while dissipating 45 mu W from a 0.6-V supply. The figure of merit is 162.1 dBc/Hz.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2018-11
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, v.65, no.11, pp.1579 - 1583

ISSN
1549-7747
DOI
10.1109/TCSII.2017.2766674
URI
http://hdl.handle.net/10203/246891
Appears in Collection
EE-Journal Papers(저널논문)
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