caa a22 4500 60620587X CHVBK 20210128101009.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00034-015-0014-8 doi (NATIONALLICENCE)springer-10.1007/s00034-015-0014-8 A CMOS Back-Gate Coupling LC Quadrature VCO with Switched Self-Biasing Tail Transistor Technique [Elektronische Daten] [Qiuzhen Wan, Yaneng Liu, Qingdi Wang] In this paper, a novel complementary differential QVCO using back-gate coupling and switched self-biasing techniques is presented. Since the back-gates of the PMOS switching transistors are used as coupling terminals to achieve the quadrature outputs, the proposed circuit has the advantages of no additional noise source and power dissipation in the coupling process. By switched self-biasing the tail transistors in a complementary manner, the QVCO's own oscillation output waveforms are injected back into the gates of the tail transistors as biasing voltages to improve the phase noise. Together with the forward back-gate biasing technique which is used to the NMOS switching transistors, the proposed QVCO can be operated at reduced supply voltage and power dissipation while maintaining remarkable circuit performances in terms of low phase noise and wide tuning range. The simulation results show that the phase noise is $$-$$ - 123.2dBc/Hz at 1MHz offset frequency from the carrier frequency of 2.35GHz, while it consumes only 3.3 mW under a 1.2V supply voltage. The free-running frequency of the QVCO is tunable from 2.13 to 2.87GHz as the tuning voltage is varied from 0.0 to 1.2V. The corresponding figure of merit of the QVCO is $$-$$ - 185.5dBc/Hz. Springer Science+Business Media New York, 2015 CMOS nationallicence Quadrature voltage-controlled oscillator (QVCO) nationallicence Back-gate coupling nationallicence Switched self-biasing nationallicence Low phase noises nationallicence Low power nationallicence Wan Qiuzhen College of Physics and Information Science, Hunan Normal University, 410081, Changsha, People's Republic of China aut Liu Yaneng College of Physics and Information Science, Hunan Normal University, 410081, Changsha, People's Republic of China aut Wang Qingdi College of Physics and Information Science, Hunan Normal University, 410081, Changsha, People's Republic of China aut Circuits, Systems, and Signal Processing Springer US; http://www.springer-ny.com 34/10(2015-10-01), 3147-3160 0278-081X 34:10<3147 2015 34 34 https://doi.org/10.1007/s00034-015-0014-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00034-015-0014-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wan Qiuzhen College of Physics and Information Science, Hunan Normal University, 410081, Changsha, People's Republic of China aut NATIONALLICENCE 700 1- Liu Yaneng College of Physics and Information Science, Hunan Normal University, 410081, Changsha, People's Republic of China aut NATIONALLICENCE 700 1- Wang Qingdi College of Physics and Information Science, Hunan Normal University, 410081, Changsha, People's Republic of China aut NATIONALLICENCE 773 0- Circuits, Systems, and Signal Processing Springer US; http://www.springer-ny.com 34/10(2015-10-01), 3147-3160 0278-081X 34:10<3147 2015 34 34