Title :
A CMOS single-ended OTA with high CMRR
Author :
Pribytko, Maxim ; Quinn, Patrick
Author_Institution :
Xilinx Ireland, Dublin, Ireland
Abstract :
A high CMRR single-ended current-mirror OTA employing a novel current CMFB is proposed. The OTA input/output common mode range, die area, power and slewing speed are not affected. The settling speed is reduced by 5%-20%. The current CMFB boosts the OTA CMRR by a factor of 30 while allowing integration of conventional OTA improvements. A unified approach relating the CMRR and transistor mismatches is proposed. The OTA was manufactured in a standard 0.25/spl mu/m CMOS process as a precision functional block of a 12 bit algorithmic ADC.
Keywords :
CMOS analogue integrated circuits; analogue-digital conversion; current mirrors; operational amplifiers; 0.25 microns; CMOS single-ended OTA; OTA CMRR; algorithmic ADC; current CMFB; high CMRR; precision functional block; settling speed; single-ended current-mirror OTA; standard CMOS process; transistor mismatches; unified approach; Boosting; CMOS logic circuits; Dynamic range; Feedback; Filters; Impedance; Manufacturing; Mirrors; Tail; Transconductance;
Conference_Titel :
Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European
Conference_Location :
Estoril, Portugal
Print_ISBN :
0-7803-7995-0
DOI :
10.1109/ESSCIRC.2003.1257130
