Title :
CMOS High-CMRR Current Output Stages
Author :
Centurelli, Francesco ; Grasso, Alfio Dario ; Pennisi, Salvatore ; Scotti, Giuseppe ; Trifiletti, Alessandro
Author_Institution :
Rome Univ., Rome
Abstract :
Two CMOS current output stages are presented. Compared to the traditional solution, which exhibits unbalanced operation, the proposed ones exploit an auxiliary high-gain feedback loop which provides differential drive, thereby highly improving the common-mode rejection ratio (CMRR). Prototypes are designed and fabricated in a 0.35-mum technology and experimental results confirm that a CMRR increase greater than 20 dB can be achieved and, for one of the two solutions, without increasing the voltage requirements.
Keywords :
CMOS analogue integrated circuits; circuit feedback; current-mode circuits; CMOS; common-mode rejection ratio; high-CMRR current output stages; high-gain feedback loop; prototypes; CMOS technology; Current mode circuits; DC generators; Differential amplifiers; Feedback loop; Helium; Operational amplifiers; Prototypes; Transconductance; Voltage; Analog electronics; CMOS; current mode; output stage;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2007.900351
