Title :
A novel OTA with digitally controlled and linearly tunable transconductance
Author :
Li, Zhi-jun ; Zeng, Yi-cheng ; Liu, Bin
Author_Institution :
Coll. of Inf. Eng., Xiangtan Univ., Xiangtan, China
Abstract :
An operational transconductance amplifier (OTA), where its transconductance gain can be digitally controlled and linearly tuned, is proposed in this paper. The realization method is achieved by biasing the two fully balanced differential pairs with class AB current mirror and the current division network (CDN). gm of the proposed OTA can be linearly tuned by an external control current Iadj and the digitally controlled current gain α in the range of 0 to 500uS. The input-voltage range of about 200mVp-p with less than 1.0% nonlinearity is obtained. The performance of the proposed OTA is discussed and confirmed through an application example and PSPICE simulation results.
Keywords :
SPICE; operational amplifiers; PSPICE simulation; class AB current mirror; current division network; digitally controlled transconductance; digitally tunable transconductance; novel OTA; operational transconductance amplifier; transconductance gain; Artificial neural networks; Band pass filters; CMOS integrated circuits; Mirrors; Transconductance; Transistors; Voltage control; Class-AB current mirror; OTA; current division network; digitally controlled and linearly tuned; transconductance;
Conference_Titel :
Consumer Electronics, Communications and Networks (CECNet), 2012 2nd International Conference on
Conference_Location :
Yichang
Print_ISBN :
978-1-4577-1414-6
DOI :
10.1109/CECNet.2012.6202171
