A -68.5 dB IM3 Low-Voltage CMOS Transconductor with Wide Tuning Range

Tien-Yu LO
Chung-Chih HUNG
Chi-Hsiang LO

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E93-A    No.8    pp.1556-1559
Publication Date: 2010/08/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E93.A.1556
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Analog Signal Processing
transconductor,  IM3,  CMFF,  tuning,  

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A CMOS transconductor for multi-mode application is presented. The transconductor includes a voltage-to-current converter and a current multiplier. Voltage-to-current conversion employs linear region MOS transistors, and the conversion features high linearity over a wide input swing range. The current multiplier, which operates in the weak inversion region, provides a wide transconductance tuning range without degrading the linearity. The transconductor was designed and fabricated in the TSMC 0.18-µm CMOS process. The results show the transconductance tuning ratio of 23 and the IM3 performance of -68.5 dB.