Title :
A low-voltage low-power fully differential rail-to-rail input/output opamp in 65-nm CMOS
Author :
Yan, Weixun ; Kolm, Robert ; Zimmermann, Horst
Author_Institution :
Inst. of Electr. Meas. & Circuit Design, Vienna Univ. of Technol., Vienna
Abstract :
A new fully differential rail-to-rail input/output opamp with constant small- and large-signal behavior fabricated in 65-nm digital CMOS technology is proposed. A novel current- mode common-mode feedback circuit is introduced to regulate the signal behavior. Measurements are done when the supply voltage is plusmn0.5 V and the load is 15 pF. The opamp attains a DC gain of 100 dB, a unity-gain frequency of 40 MHz, a phase margin of 64deg and a low power consumption of 720 muW. The small-signal behavior variation is only plusmn2.2%. The large-signal behavior is also verified to be constant.
Keywords :
CMOS analogue integrated circuits; differential amplifiers; feedback amplifiers; low-power electronics; operational amplifiers; DC gain; current-mode common-mode feedback circuit; digital CMOS technology; frequency 40 MHz; fully differential rail-to-rail input-output opamp; gain 100 dB; low-power opamp; low-voltage opamp; phase margin; power 720 muW; size 65 nm; small-signal behavior variation; unity-gain frequency; CMOS digital integrated circuits; CMOS technology; Capacitance; Capacitors; Design optimization; Feedback circuits; Frequency; Leakage current; Rail to rail inputs; Voltage;
Conference_Titel :
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-1683-7
Electronic_ISBN :
978-1-4244-1684-4
DOI :
10.1109/ISCAS.2008.4541907
