Title :
High-CMRR Current Amplifier Architecture and Its CMOS Implementation
Author :
Pennisi, S. ; Piccioni, M. ; Scotti, G. ; Trifiletti, A.
Author_Institution :
Dipt. di Ingegneria Elettrica, Elettronica e dei Sistemi, Catania Univ.
Abstract :
A novel current operational amplifier, in which the traditionally adopted input current follower is replaced by an input stage that exhibits current gain and single-input-to-differential-output conversion, is presented. Due to this, increased values of both dc gain and common-mode rejection ratio (CMRR) are obtained in the overall amplifier. A CMOS implementation, along with postlayout simulations, which are in good agreement with expected data, is also included. The proposed design is supplied with 2.5 V, dissipates 0.7 mW, and provides a nominal dc gain, a gain-bandwidth product, and a CMRR (at dc) of 72 dB, 28 MHz, and greater than 100 dB, respectively
Keywords :
CMOS analogue integrated circuits; integrated circuit design; operational amplifiers; 0.7 mW; 2.5 V; 28 MHz; CMOS; CMRR; common mode rejection ratio; current operational amplifier; Capacitors; Circuits; Differential amplifiers; Equations; Frequency; Operational amplifiers; Topology; Transconductance; Transconductors; Voltage; CMOS; current mode; current operational amplifiers (COAs); single-to-differential conversion;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2006.882123
