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Analysis and Design of a 1V Charge Sampling Readout Amplifier in 90nm CMOS for Medical Imaging

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2 Author(s)
Cenkeramaddi, L.R. ; Norwegian Univ. of Sci. & Technol., Trondheim ; Ytterdal, T.

In this paper, we present the analysis and design of a charge sampling amplifier (CSA) in 90 nm CMOS for medical imaging applications. The CSA is designed based on a 1 V CMOS folded cascode operational transconductance amplifier (OTA) with lead compensation. The OTA achieves a DC gain of 45-dB and a unity gain frequency of 1.3 GHz at a power consumption of 200 muW. Performance of the charge sampling amplifier is investigated when it is connected to a single capacitive micro machined ultrasound transducer (CMUT). The proposed CSA front end architecture for ultrasound imaging achieves a transfer gain of 19 dB from CMUT signal source to the output of the CSA (across feedback capacitor) with sampling simultaneously.

Published in:

VLSI Design, Automation and Test, 2007. VLSI-DAT 2007. International Symposium on

Date of Conference:

25-27 April 2007

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