A gain boosted folded cascode using telescopic boosting amplifiers with switched capacitor input level shifters

Start Page
89
End Page
96
Citation
Proceedings of the 10th IASTED International Conference on Biomedical Engineering : February 11 - 13, 2013, Innsbruck, Austria / ed.: A. R. Boccaccini. - Anaheim, Calif. [u.a.] : ACTA Press, 2013. - Seite 89-96
Contribution to Conference
10th IASTED International Conference on Biomedical Engineering, BioMed 2013  
Publisher DOI
10.2316/P.2013.791-052
Scopus ID
2-s2.0-84883863593
Publisher
ACTA Press
This paper describes a single stage fully differential folded cascode operational transconductance amplifier (OTA) with fully differential gain boosting amplifiers designed in 1.2 VDC 130nm CMOS process technology. The amplifier is the driver for the analog to digital converter (ADC) of a blood pressure sensing medical implant [1] which uses wireless power transmission as its energy source [2]. The medical implant's design specifications require an amplifier with wide output swing, high accuracy, and the bandwidth to drive a differential 5 pF load at 4 ksps with minimum power consumption. The gain boosting amplifiers are telescopic cascoded amplifiers, which, by their design, have an input and output common mode voltage relationship which is opposite to what is needed for a gain boosted cascode configuration. To correct for this, a method for DC shifting the amplifier's input voltage using a switched capacitor network is presented.
Subjects
Biomedical electronics
Biosensors and transducers
Data and signal acquisition
Electronic medical devices
DDC Class
620: Ingenieurwissenschaften