Title :
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
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;
Conference_Titel :
Signal Processing, Computing and Control (ISPCC), 2012 IEEE International Conference on
Conference_Location :
Waknaghat Solan
Print_ISBN :
978-1-4673-1317-9
DOI :
10.1109/ISPCC.2012.6224354
