Fully differential transconductance amplifier with common-mode o

Details Fully differential transconductance amplifier with common-mode o Fully differential transconductance amplifier with common-mode o

1994-10-18

1995-07-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

054365945

ABSTRACT:
A differential transconductance amplifier consisting of a bipolar differential amplifier (110) and an active load circuit (120) for the bipolar differential amplifier (110). The transconductance amplifier is suitable for driving a load (130). The active load circuit (120) comprises a bipolar differential amplifier (140), a metal-oxide-silicon (MOS) amplifier (150), and a resistor R1. The active load circuit (120) generates active load currents IAL1 and IAL2. The output of the transconductance amplifier are the differential output currents I1 and I2 which are supplied to the load (130). Differential output currents I1 and I2 are the sum of the currents into the nodes between the bipolar amplifier circuit (110) and the active load circuit (120). The gain of the transconductance amplifier is controlled by a current source that biases the differential amplifier (110).

REFERENCES:
patent: 4007427 (1977-02-01), Leidich
Pan Wis, Rolf Schaumann, & Paul Latham, "Design Considerations for Common-Mode Feedback Circuits in Fully-Differential Operational Transconductance Amplifiers with Tuning", pp. 1363-1366. IEEE Proceedings of ISCAS (Singapore) Jun. 1991.

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