Title :
A 1.8 V pseudo-differential switched-capacitor amplifier
Author :
Günay, Zeki Sezgin ; Soenen, Eric Georges ; Embabi, Sherif ; Sanchez-Sinencio, Edgar
Author_Institution :
Maxim Integrated Products, Sunnyvale, CA, USA
Abstract :
A switched-capacitor amplifier (SCA), for a 1.8 V, 10 bit, 2.5 Ms/sec data converter has been developed. For the SCA to settle within 0.05% at 2.5 Ms/sec rate, a pseudo-differential core amplifier, consisting of two fully cascoded amplifiers with gain-enhancement is proposed. A switching scheme is used for offset cancellation and, simultaneously, for the capacitive level shifting needed to bias the gain-enhancement amplifiers. The core amplifier offers 100 dB gain, more than 100 MHz unity-gain frequency with 1.8 V supply. The SCA sinks 1.25 mA at 1.8 V and has a closed loop gain of 2. It was fabricated in a 1.2 μm CMOS process. Functionality and performance were verified
Keywords :
CMOS analogue integrated circuits; closed loop systems; data conversion; differential amplifiers; integrated circuit measurement; switched capacitor networks; 1.2 micron; 1.25 mA; 1.8 V; 10 bit; 100 MHz; 100 dB; CMOS process; capacitive level shifting; closed loop gain; data converter; fully cascoded amplifiers; gain-enhancement amplifiers; offset cancellation; pseudo-differential switched-capacitor amplifier; unity-gain frequency; CMOS process; Capacitors; Clocks; Data conversion; Differential amplifiers; Frequency; Instruments; Sampling methods; Transconductors; Voltage;
Conference_Titel :
Custom Integrated Circuits Conference, 1998. Proceedings of the IEEE 1998
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-4292-5
DOI :
10.1109/CICC.1998.695002
