CMOS High-CMRR Current Output Stages

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 d...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 2, Analog and digital signal processing Analog and digital signal processing, 2007-09, Vol.54 (9), p.745-749
Main Authors: Centurelli, F., Grasso, A.D., Pennisi, S., Scotti, G., Trifiletti, A.
Format: Article
Language:English
Subjects:
Analog electronics
Circuits
CMOS
CMOS technology
current mode
Current mode circuits
DC generators
Differential amplifiers
Electric potential
Feedback loop
Feedback loops
Noise levels
Operational amplifiers
output stage
Prototypes
Rejection
Transconductance
Voltage
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Summary: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.
ISSN:1549-7747
1057-7130
1558-3791
DOI:10.1109/TCSII.2007.900351