Title :
Opamp with 106 dB DC gain in 120nm digital CMOS
Author :
Schlögl, F. ; Zimmermann, H.
Author_Institution :
Inst. fur elektrische Mess-und Schaltungstechnik, Technische Univ. Wien, Austria
Abstract :
A three-stage operational amplifier employing only regular-threshold devices in a 120nm digital CMOS technology with a gain-boosted folded-cascode input stage and a class AB rail-to-rail output stage is presented. The gain boost results in a low-frequency differential gain of 106dB at a supply voltage of 1.2V. A bulk regulator of the input transistors increases the input-voltage range to -0.1...+1.0V. A gain-bandwidth product of 57MHz and a phase margin of 71/spl deg/ are measured for loads of 5.5pF.
Keywords :
CMOS digital integrated circuits; operational amplifiers; -0.1 to 1.0 V; 1.2 V; 106 dB; 120 nm; 5.5 pF; bulk regulator; class AB rail-to-rail output stage; digital CMOS technology; gain-boosted folded-cascode input stage; low-frequency differential gain; regular-threshold devices; three-stage operational amplifier; Analog circuits; Breakdown voltage; CMOS technology; Differential amplifiers; Digital circuits; Operational amplifiers; Power amplifiers; Power supplies; Threshold voltage; Transistors;
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.2003.1257152
