MOS operational transconductance amplifier using an adaptively-b

Details MOS operational transconductance amplifier using an adaptively-b MOS operational transconductance amplifier using an adaptively-b

1995-06-08

1997-02-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330261, H03F 345

Patent

active

056025092

ABSTRACT:
An MOS OTA that enables to provide superior transconductance linearity within a wider input voltage range without increase in circuit scale and to be formed on a semiconductor integrated circuit device. The MOS OTA includes a differential pair of first and second MOSFETs whose sources are coupled together, and a quadritail circuit for driving the differential pair by its output signal having a square-law characteristic. The quadritail circuit contains a first transistor pair of third and fourth MOSFETs, a second transistor pair of fifth and sixth MOSFETs, and a constant current source or sink for driving the first and second transistor pairs. Gates of the third and fourth MOSFETs are applied with the differential input signal. Gates of the fifth and sixth MOSFETs are coupled together to be applied with a dc voltage of the differential input signal. The transconductance nonlinearity of the differential pair is compensated by the output current of the quadritail circuit.

REFERENCES:
patent: 5381113 (1995-01-01), Kimura
K. Kimura, "An MOS Operational Transconductance Amplifier and an MOS Four-Quadrant Analog Multiplier Using the Quadritail Cell", Dec. 12, 1992, IEICE Trans. Fundamentals, 1774-1776, vol. E75-A.
A. Nedungadi et al., "Design of Linear CMOS Transconductance Elements", IEEE Transactions on Circuits and Systems, vol. CAS-31, No. 10, Oct. 1984, pp. 891-894.

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