A Wide Locking Range Injection Locked Frequency Divider with Quadrature Outputs

Sheng-Lyang JANG  Cheng-Chen LIU  Jhin-Fang HUANG  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.3   pp.373-377
Publication Date: 2008/03/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.3.373
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
CMOS,  quadrature injection-locked frequency divider,  locking range,  tunable active inductor,  

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Summary: 
This paper presents a quadrature injection locked frequency divider (ILFD) employing tunable active inductors (TAIs), which are used is to extend the locking range and to reduce die area. The CMOS ILFD is based on a new quadrature voltage-controlled oscillator (VCO) with cross-coupled switching pairs and TAI-C tanks, and was fabricated in the 0.18-µm 1P6M CMOS technology. The divide-by-2 LC-tank ILFD is performed by adding injection MOSFETs between the differential outputs of the VCO. Measurement results show that at the supply voltage of 1.8 V, the divider free-running frequency is tunable from 1.34 GHz to 3.07 GHz, and at the incident power of 0 dBm the locking range is about 6 GHz (137%), from the incident frequency 1.37 GHz to 7.38 GHz. The core power consumption is 22.8 mW. The die area is 0.630.55 mm2.