Low Voltage OTA Using Two-MOSFET Subtractors between Rails

Kawori TAKAKUBO  Shigetaka TAKAGI  Hajime TAKAKUBO  Nobuo FUJII  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E83-A   No.2   pp.197-203
Publication Date: 2000/02/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
OTA,  voltage subtractor,  low power supply,  

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An OTA without a tail-current source is proposed for low power supply voltages. Only two MOSFET's are connected between power supply lines in order to operate under low power supply voltages. A few MOSFET's are added at the expense of eliminating the tail-current source of the conventional OTA. SPICE simulation is shown in order to evaluate the proposed circuits. As an application, a low-pass filter is realized by employing the proposed OTA's.