Operational transconductance amplifier operable at low supply vo

Details Operational transconductance amplifier operable at low supply vo Operational transconductance amplifier operable at low supply vo

1996-04-15

1998-01-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

057125945

ABSTRACT:
An OTA capable of low-voltage operation at a voltage as low as approximately 1 V while restraining the circuit scale increase and keeping approximately the same input voltage range as that of the conventional one. This OTA has a differential pair of first and second bipolar or MOS transistors driven by a first constant current source, and a squarer driven by a second constant current source. The differential pair is applied with an input voltage and produces an output current of the OTA. The squarer is applied with the input voltage and produces differentially first and second output currents having a square-law characteristic. The first constant current source supplies a first constant current equal to a second constant current supplied by the second constant current source. The second output current of the squarer is supplied to the first constant current source.

REFERENCES:
patent: 5371474 (1994-12-01), Wassenaar et al.
patent: 5481224 (1996-01-01), Kimura
patent: 5485119 (1996-01-01), Kimura
patent: 5500623 (1996-03-01), Kimura
patent: 5512855 (1996-04-01), Kimura
patent: 5521542 (1996-05-01), Kimura
patent: 5561392 (1996-10-01), Kimura
patent: 5578965 (1996-11-01), Kimura
patent: 5581211 (1996-12-01), Kimura
K. Kimura, "Some Circuit Design Techniques . . . Rectifiers Operable on Low Supply Voltage", IEEE Trans. on Cir. and Sys. --I: Fund. Theory and Applns, vol. 39, No. 9, Sep. 1992, pp. 771-777.

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