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

fYear

2012

fDate

21-23 April 2012

Firstpage

64

Lastpage

67

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). g_m of the proposed OTA can be linearly tuned by an external control current I_adj and the digitally controlled current gain α in the range of 0 to 500uS. The input-voltage range of about 200mV_p-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;

fLanguage

English

Publisher

ieee

Conference_Titel

Consumer Electronics, Communications and Networks (CECNet), 2012 2nd International Conference on

Conference_Location

Yichang

Print_ISBN

978-1-4577-1414-6

Type

conf

DOI

10.1109/CECNet.2012.6202171

Filename

6202171