Title :
Improved logarithmic converter based on a transconductance feedback amplifier
Author :
Wilson, Brett ; Al-Gahtani, Muhammad
Author_Institution :
Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol., UK
Abstract :
The traditional logarithmic amplifier configuration based on a voltage operational amplifier with a diode-connected transistor in its feedback loop displays a significantly reduced bandwidth at lower signal levels. Replacing the operational amplifier by a transconductance feedback amplifier overcomes this problem completely and offers constant-bandwidth operation throughout the full signal range
Keywords :
CMOS analogue integrated circuits; SPICE; current-mode circuits; feedback amplifiers; operational amplifiers; SPICE; bandwidth modulation; constant-bandwidth operation; full signal range; improved logarithmic converter; level shifting; transconductance feedback amplifier; Bandwidth; Circuits; Diodes; Displays; Feedback amplifiers; Feedback loop; Operational amplifiers; Transconductance; Transistors; Voltage;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921940
