Title :
Low quiescent current high speed amplifier for LCD column driver
Author :
Fazio, Salvatore Di ; Pulvirenti, Francesco ; Signorelli, Tiziana ; Lao, Christian ; Pennisi, Salvatore
Author_Institution :
HPC-Display Div., STMicroelectronics, Catania
Abstract :
The design of a very low-current transconductance operational amplifier specifically optimized for a switched-capacitor LCD column driver is presented. Despite its stringent standby current requirements (lower than 700 nA), the amplifier exhibits a DC gain of about 80 dB and, working in class AB, provides a slew rate greater than 20 V/mus under a load capacitance of 500 fF. The gain-bandwidth product and phase margin are about 2 MHz and 70deg. With exception of the DC gain, these performances represent a major improvement with respect to comparable solutions, and are obtained while halving the area occupation.
Keywords :
amplifiers; driver circuits; switched capacitor networks; bandwidth 2 MHz; capacitance 500 fF; gain 80 dB; low quiescent current high speed amplifier; low-current transconductance operational amplifier; switched-capacitor LCD column driver; Active matrix liquid crystal displays; Capacitance; Capacitors; Design optimization; Driver circuits; Electronic mail; Frequency; Operational amplifiers; Performance gain; Transconductance;
Conference_Titel :
Circuit Theory and Design, 2007. ECCTD 2007. 18th European Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4244-1341-6
Electronic_ISBN :
978-1-4244-1342-3
DOI :
10.1109/ECCTD.2007.4529648
