Conference Proceeding

Programmable linearized CMOS OTA for fully differential continuous-time filter design

Department of Microelectronic Systems, Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, Narutowicza 11/12, 80-952 ¿, Poland;
06/2008; DOI:10.1109/INFTECH.2008.4621688 ISBN: 978-1-4244-2244-9 pp.1-4 In proceeding of: Information Technology, 2008. IT 2008. 1st International Conference on
Source: IEEE Xplore

ABSTRACT In this paper, a feedforward linearization method for programmable CMOS Transconductance Operational Amplifier (OTA) is described. The proposed circuit technique is developed using simple source-coupled differential pair transconductors and linear reference resistor (R). As a result, an efficient linearization of a transfer characteristic of the OTA is obtained. The g m - programmability of the developed OTA was obtained using a programmable current mirror array technique. SPICE simulations show that for 0.35 μm AMS CMOS process with a single +3 V power supply, total harmonic distortion (THD) at 1V pp and temperature range from −30°C to +90°C is less than −35.8dB. Moreover the input voltage range of linear operation is increased. Power consumption of the linearized OTA circuit is 0.76 mW.

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Keywords

1V pp
 
feedforward linearization method
 
input voltage range
 
linear operation
 
linear reference resistor
 
linearized OTA circuit
 
power supply
 
programmable CMOS Transconductance Operational Amplifier
 
programmable current mirror array technique
 
proposed circuit technique
 
simple source-coupled differential pair transconductors
 
single +3
 
THD
 
total harmonic distortion
 
μm AMS CMOS process
 

Stanislaw Szczepanski