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A 9.3MHz to 5.7GHz tunable LC-based VCO using a divide-by-N injection-locked frequency divider

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3 Author(s)
Hara, S. ; Dept. Phys. Electron., Tokyo Inst. of Technol., Tokyo, Japan ; Okada, K. ; Matsuzawa, A.

This paper proposes a novel wideband voltage-controlled oscillator (VCO) for multi-band transceivers. The proposed oscillator has a core VCO and a tuning-range extension circuit, which consists of an injection-locked frequency divider (ILFD), and flip flop dividers. The 2-stage differential ILFD can generate quadrature outputs, and it realizes 2, 3, 4, and 6 of divide ratio with very wide output frequency range. The proposed circuit is implemented by using a 90 nm CMOS process, and the chip area is 250 ¿m × 200 ¿m. The measured results achieves 9.3 MHz-to-5.7 GHz (199%) of continuous frequency tuning range with -210 dBc/Hz of FoMT.

Published in:

Solid-State Circuits Conference, 2009. A-SSCC 2009. IEEE Asian

Date of Conference:

16-18 Nov. 2009