CDTA based logarithmic amplifier

Author

Maktoomi, Mohammad A. ; Mishra, R.K. ; Siddiqi, Muzaffar A. ; Pyari, M. Prem

Author_Institution

Electron. Eng. Dept., Aligarh Muslim Univ., Aligarh, India

fYear

2012

fDate

15-17 March 2012

Firstpage

1

Lastpage

4

Abstract

A logarithmic amplifier using current differencing trans-conductance amplifier (CDTA) is presented. Both current as well as voltage mode inputs are possible. Output can also be voltage or current. Owing to its current mode operation it consumes less power. Furthermore, the instability problem found in op-amp based logarithmic amplifiers due to the presence of an active element in the feedback loop is absent in the CDTA logarithmic amplifier. The simulation result confirms the logarithmic behavior with a very low-error. It also shows a good dynamic range.

Keywords

operational amplifiers; CDTA-based logarithmic amplifier; current differencing transconductance amplifier; current mode input; current mode operation; feedback loop; instability problem; op-amp-based logarithmic amplifier; voltage mode input; CMOS integrated circuits; Dynamic range; Educational institutions; Integrated circuit modeling; Light emitting diodes; Resistors; Simulation; CDTA; anti-log amplifier; compression; current-mode circuits; logarithmic amplifier;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing, Computing and Control (ISPCC), 2012 IEEE International Conference on

Conference_Location

Waknaghat Solan

Print_ISBN

978-1-4673-1317-9

Type

conf

DOI

10.1109/ISPCC.2012.6224354

Filename

6224354