Rail-to-Rail OTA Utilizing Linear V-I Conversion Circuit Whose Input Stage is Composed of Single Channel MOSFETs

Nobukazu TAKAI  Keigo KAWAI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E88-A   No.4   pp.832-837
Publication Date: 2005/04/01
Online ISSN: 
DOI: 10.1093/ietfec/e88-a.4.832
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Selected Papers from the 17th Workshop on Circuits and Systems in Karuizawa)
rail-to-rail,  OTA,  single channel MOSFET,  linear V-I converter,  

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In this paper, rail-to-rail OTA utilizing linear V-I conversion circuit whose input stage is composed of single channel MOSFETs, is proposed. The proposed conversion circuit is realized with two circuit blocks. One of them consists of a single MOSFET operating in plural regions and the other a pair of MOSFETs in saturation region and cut-off region. Combination of the circuit blocks achieves a linear voltage-current conversion for a rail-to-rail input signal. Rail-to-rail OTA is proposed using the proposed conversion circuit. HSPICE simulations are performed to verify the validity of the proposed V-I converter and rail-to-rail OTA. Simulation results indicate good performances. As an application example, 2nd-order LPF is realized using the proposed OTAs.