A 1.9-GHz Si bipolar quadrature VCO with fully-integrated LC tank

A fully monolithic voltage controlled oscillator with quadrature outputs has been implemented in a Si bipolar process with a cut-off frequency of 40 GHz. The circuit techniques to achieve highly accurate quadrature outputs as well as the low phase noise with low power dissipation are used. The phase and gain errors are less than 1 degree and 0.1 dB, respectively. The measured phase noise at a 600 kHz offset frequency from a 1.9 GHz center frequency is -123 dBc/Hz. The quadrature cores drain 16 mA from 2.7 V supply.

[1]  A. Rofougaran,et al.  A 900 MHz CMOS LC-oscillator with quadrature outputs , 1996, 1996 IEEE International Solid-State Circuits Conference. Digest of TEchnical Papers, ISSCC.

[2]  A. Abidi.  Direct-conversion radio transceivers for digital communications , 1995, Proceedings ISSCC '95 - International Solid-State Circuits Conference.

[3]  Michiel Steyaert,et al.  Low-noise voltage-controlled oscillators using enhanced LC-tanks , 1995 .

[4]  J.W. Archer,et al.  A broad-band VHF mixer exhibiting high image rejection over a multidecade baseband frequency range , 1981, IEEE Journal of Solid-State Circuits.