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A 470- \mu{\hbox {W}} 5-GHz Digitally Controlled Injection-Locked Multi-Modulus Frequency Divider With an In-Phase Dual-Input Injection Scheme

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3 Author(s)
Joonhee Lee ; Dept. of Electr. Eng. & Comput. Sci., KAIST, Daejeon, South Korea ; Sunghyun Park ; SeongHwan Cho

This paper presents a digitally controlled injection-locked multimodulus frequency divider (ILMFD) based on a ring-oscillator using inverter chains for a small area and low power consumption. In the proposed ILMFD, division ratios of 2, 3, 4, 5 and 6 are achieved by using a programmable delay line that changes the self-oscillation frequency of the ring-oscillator. The locking range of the proposed ILMFD is improved by employing a dual-input injection scheme, which unlike previous multiinput injection schemes, does not require distinct phase inputs. A prototype chip implemented in a 0.13-μm CMOS process has an area of 35×33 μm2 and operates at 5 GHz while consuming 470 μW from 1.2 V supply, where 350 μW is dissipated in the core of the ILMFD. The proposed divider is the first reported multimodulus ILFD with digitally controlled division ratios and an in-phase dual-input injection scheme.

Published in:

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:19 ,  Issue: 1 )

Date of Publication:

Jan. 2011

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