Title :
A gain-enhanced two-stage fully-differential CMOS op amp with high unity-gain bandwidth
Author :
Sun, Runhua ; Peng, Lindsay
Author_Institution :
Appl. Micro Circuits Corp., San Diego, CA, USA
Abstract :
This paper presents a gain-enhanced two-stage fully differential CMOS op amp. A very high dc gain is achieved together along with a very high unity-gain bandwidth and low power dissipation. The pole-zero doublet arising from the gain-enhancement is analyzed in detail. The side effects of the gain-enhancement circuit are minimized. The frequency responses indicate that more than 120 dB open loop dc gain and 500 MHz unity-gain bandwidth are obtained. The simulated settling behavior shows that it only takes 13.5 ns to reach more than 120 dB settling accuracy. To date, this is one of the best high-performance op amps that have been reported
Keywords :
CMOS analogue integrated circuits; differential amplifiers; frequency response; low-power electronics; operational amplifiers; poles and zeros; 120 dB; 13.5 ns; 500 MHz; CMOS; frequency responses; gain-enhanced two-stage fully-differential amplifier; op amp; pole-zero doublet; power dissipation; settling behavior; unity-gain bandwidth; Bandwidth; Circuits; Differential amplifiers; Frequency; MOS devices; Operational amplifiers; Performance gain; Power dissipation; Sun; Tail;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Conference_Location :
Phoenix-Scottsdale, AZ
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1011016
