Title :
A low-voltage high-gain wide-bandwidth class-AB differential difference amplifier
Author :
Ge, Fuding ; Thomas, Brent
Author_Institution :
Intel Corp., Chandler, AZ
fDate :
Nov. 30 2008-Dec. 3 2008
Abstract :
This paper presents a CMOS low-voltage high gain and wide bandwidth differential difference amplifier (DDA). It is based on a robust two-stage class-AB amplifier with cascode Miller compensation. The first stage is a folded-cascode OTA with improved wide swing biasing circuit and the second stage is class-AB output stage biased with translinear circuit. The two input pairs can be either NMOS or PMOS pair. It achieves a DC open loop gain of 80 dB and unity-gain bandwidth of 20 MHz with 380 muA current drawn from a single 1.5 V power supply in 0.13 mum CMOS. Its application for current feedback instrumentation amplifier is discussed.
Keywords :
CMOS integrated circuits; compensation; feedback amplifiers; instrumentation amplifiers; CMOS process; DC open loop gain; DDA; NMOS pair; PMOS pair; bandwidth 20 MHz; cascode Miller compensation; current 380 muA; current feedback instrumentation amplifier; folded-cascode OTA; gain 80 dB; low-voltage high-gain wide-bandwidth class-AB differential difference amplifier; size 0.13 mum; translinear circuit; unity-gain bandwidth; voltage 1.5 V; wide swing biasing circuit; Bandwidth; Broadband amplifiers; Circuits; Differential amplifiers; Feedback; Gain; Instruments; MOS devices; Power supplies; Robustness;
Conference_Titel :
Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on
Conference_Location :
Macao
Print_ISBN :
978-1-4244-2341-5
Electronic_ISBN :
978-1-4244-2342-2
DOI :
10.1109/APCCAS.2008.4746235
