A Bipolar Linear Transconductor Using Translinear Cells and Its Application

Won-Sup CHUNG  Seong-Hoon KIM  Sang-Hee SON  Hee-jun KIM  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E89-A   No.11   pp.3341-3343
Publication Date: 2006/11/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e89-a.11.3341
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Analog Signal Processing
Keyword: 
linear transconductor,  transconductance amplifier,  grounded inductor,  IF bandpass filter,  

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Summary: 
A novel linear transconductor using translinear cells is proposed. It consists of a voltage follower, a resistor, and a current follower. SPICE simulations using an 8 GHz bipolar transistor-array parameter show that the linear transconductor with a transconductance of 1 mS exhibits a linearity error of less than 0.75% over an input voltage range of 1 V for a supply voltage of 2.0 V. The temperature coefficient of the transconductance is less than 124 ppm/. The -3-dB frequency of the transconductance is more than 4.5 GHz. Applying the linear transconductor as a building block, the design of a bandpass filter with center frequency of 85 MHz and Q-factor of 80 is presented.