Title :
CMOS class-AB tunable voltage-feedback current operational amplifier
Author :
Esparza-Alfaro, Fermin ; Lopez-Martin, Antonio J. ; Palumbo, Gaetano ; Permisi, Salvatore
Author_Institution :
Dept. of Electr. & Electron. Eng., Public Univ. of Navarra, Pamplona, Spain
Abstract :
We describe a CMOS class AB Voltage Feedback Current Operational Amplifier (VFCOA) offering both tunable gain (from 0 dB to 24 dB) and bandwidth (from 1 MHz to 3MHz). The implementation is based on class AB second generation current conveyors and exploits an electronically tunable transistorized feedback network. The solution was fabricated in 0.5-μm technology, the die area was 0.127 mm2 and measurement results show a dynamic range (1%, 300kHz, maximum gain) of 87.5 dB and a THD lower than -40dB for an output current 23 times the bias current.
Keywords :
CMOS analogue integrated circuits; current conveyors; feedback amplifiers; harmonic distortion; operational amplifiers; CMOS class-AB tunable VFCOA; THD; bias current; class AB second generation current conveyors; electronically tunable transistorized feedback network; size 0.5 mum; voltage feedback current operational amplifier; Bandwidth; CMOS integrated circuits; Distortion measurement; Gain; Gain measurement; Mirrors; Operational amplifiers; CMOS analog integrated circuits; class AB; current amplifier; current conveyor; current mirror; current mode; quasi-floating gate transistor; voltage feedback operational amplifier;
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2014 21st IEEE International Conference on
DOI :
10.1109/ICECS.2014.7049941
