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Wide tunable CMOS multiple-nested-feedback ring type L-C oscillator

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4 Author(s)
J. T. Hwang ; Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea ; S. H. Woo ; M. W. Hwang ; G. H. Cho

A new CMOS multiple-nested-feedback ring type L-C oscillator (MFLCO) is presented. The new oscillator shows a wide tuning range and fast speed at low voltage operation. The phase noise is expected to be approximately that of a monolithic L-C oscillator. For three and four-stage MFLCOs, 200 MHz and 520 MHz tuning ranges are achieved without varactor diodes, respectively. The maximum speed exceeds 3 GHz, which reaches approximately fT/3 with 0.8 μm CMOS technology. The proposed oscillators are suitable for RF frequency synthesisers and multiphase applications

Published in:

Electronics Letters  (Volume:35 ,  Issue: 2 )