Title :
Differential OPAMP with Inherent Common-Mode Control and Self-Biased Cascodes in 120nm CMOS
Author :
Schlogl, F. ; Dietrich, Horst ; Zimmermann, Horst
Author_Institution :
Inst. of Electr. Measurements & Circuit Design, Vienna Univ. of Technol.
Abstract :
A fully differential operational amplifier with high gain and high bandwidth in deep-sub-mum CMOS is presented. The operational amplifier has up to five serial connected stages. The shown signal-path concept is suitable to reach high gain and bandwidth. The used compensation avoids pole-zero doublet problems. Positive-feedback circuits are used to set the operating point of cascodes and load elements. Production costs are kept low by using only regular-threshold transistors in the design. A DC gain of 99dB and a transit frequency of 330MHz were measured
Keywords :
CMOS analogue integrated circuits; circuit feedback; operational amplifiers; 120 nm; 330 MHz; 99 dB; common-mode control; deep-sub-micron CMOS; differential op amp; operational amplifier; pole-zero doublet problem avoidance; positive-feedback circuits; self-biased cascodes; signal-path concept; Bandwidth; CMOS technology; Circuit synthesis; Costs; Differential amplifiers; Feedforward systems; Frequency; Gain measurement; Low voltage; Operational amplifiers; common mode control; operational amplifier; self-biased cascode;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342252
