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10MHz to 7GHz quadrature signal generation using a divide-by-4/3, -3/2, -5/3, -2, -5/2, -3, -4, and -5 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 presents a wideband LC-based VCO using a divide-by-fractional-N injection-locked frequency divider (ILFD), and the fractional-N division is realized by the proposed modulated injection technique. The feedback modulation of incident signals eliminates unwanted injections, which contributes to enlarge the locking range. The ILFD consists of a 2-stage differential ring oscillator, which achieves the multi-decade frequency tuning with quadrature outputs. The proposed circuit is implemented by using a 90 nm CMOS process, and the measured results achieves 10 MHz-to-7 GHz of continuous frequency tuning range with 9.6-15.6mW of power consumption. The chip area is 250 × 200 μm2.

Published in:

VLSI Circuits (VLSIC), 2010 IEEE Symposium on

Date of Conference:

16-18 June 2010

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