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A 108-GHz InP-HBT monolithic push-push VCO with low phase noise and wide tuning bandwidth

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8 Author(s)
K. W. Kobayashi ; Electron. & Technol. Div., TRW Inc., Redondo Beach, CA, USA ; A. K. Oki ; L. T. Tran ; J. C. Cowles
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This paper reports on what is believed to be the highest frequency bipolar voltage-controlled oscillator (VCO) monolithic microwave integrated circuit (MMIC) so far reported. The W-band VCO is based on a push-push oscillator topology, which employs InP HBT technology with peak fT's and fmax's of 75 and 200 GHz, respectively. The W-band VCO produces a maximum oscillating frequency of 108 GHz and delivers an output power of +0.92 dBm into 50 Ω. The VCO also obtains a tuning bandwidth of 2.73 GHz or 2.6% using a monolithic varactor. A phase noise of -88 dBc/Hz and -109 dBc/Hz is achieved at 1- and 10-MHz offsets, respectively, and is believed to be the lowest phase noise reported for a monolithic W-band VCO. The push-push VCO design approach demonstrated in this work enables higher VCO frequency operation, lower noise performance, and smaller size, which is attractive for millimeter-wave frequency source applications

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IEEE Journal of Solid-State Circuits  (Volume:34 ,  Issue: 9 )