Tunable operational transconductance amplifier and two-quadrant

Details Tunable operational transconductance amplifier and two-quadrant Tunable operational transconductance amplifier and two-quadrant

1995-06-07

1996-11-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

327357, 327359, 330253, H03F 345

Patent

active

055789650

ABSTRACT:
A tunable MOS operational transconductance amplifier which outputs a differential output current in response to a differential input voltage. The amplifier has a tail current source, a first transistor pair, a second transistor pair and a third transistor pair. The sources of the first and second transistor pairs are connected in common to the tail current source. The third transistor pair is connected in cascode to the first transistor pair. The gates of the second transistor pair are connected to drains of the first transistor pair, respectively. The gates of one of the first transistor pair are connected to each other and a tuning voltage is applied to the gates of the one pair. The differential input voltage is applied between the gates of the other of the first transistor pair and the third transistor pair. The differential output current of the amplifier includes at least the differential drain current of the second transistor pair.

REFERENCES:
patent: 4780630 (1988-10-01), Corpechot et al.
Klaas Bult et al., "A CMOS Four-Quadrant Analog Multiplier", IEEE Journal of Solid-State Circuits, vol. SC-21, No. 3, Jun. 1986, pp. 430-435.
Zhenhua Wang et al., "A Voltage-Controllable Linear MOS Transconductor Using Bias Offset Technique", IEEE Journal of Solid-State Circuits, vol. 25, No. 1, Feb. 1990, pp. 315-317.

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