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IEICE Transactions on Electronics 2008 E91-C(6):956-962; doi:10.1093/ietele/e91-c.6.956
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section - Papers - Electronic Circuits

Divide-by-3 LC Injection Locked Frequency Divider Implemented with 3D Inductors

Sheng-Lyang JANG1, Chia-Wei CHANG1, Chien-Feng LEE1 and Jhin-Fang HUANG1

1 The authors are with the Dept. of Electronic Engineering, National Taiwan Univ. of Science and Technology, Taipei, Taiwan, R.O.C. E-mail: sljjj{at}mail.ntust.edu.tw


  Abstract

This paper proposes a wide-locking range divide-by-3 frequency divider employing 3D helical inductors fabricated in the 0.18-µm 1P6M CMOS technology. The divider consists of an nMOS cross-coupled LC oscillator and two injection MOSFETs in series with the cross-coupled NMOSFETs, and the LC resonator is composed of two 3D helical inductors and varactors. The aim of using 3D inductor is to reduce chip size. At the supply voltage of 1.2 V, the divider free-running frequency is tunable from 2.1 GHz to 2.6 GHz, and at the incident power of 0 dBm the locking range is about 2.11 GHz (29.16%), from the incident frequency 5.99 GHz to 8.1 GHz. The core power consumption is 4.56 mW. The die area is 0.664 x 0.831 mm2.

Key Words: CMOS, VCO, divide-by-3 injection-locked frequ- ency divider, locking range, 3-dimensional inductor

Manuscript received January 16, 2008.


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