Transconductance amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Reexamination Certificate

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Details

C330S258000, C330S260000

Reexamination Certificate

active

10973728

ABSTRACT:
A transconductance amplifier comprising a first input circuit having a first feedback loop; a second input circuit having a second feedback loop; a resistor having a first interface connected to the first input circuit and a second interface connected to the second input circuit; a first differential pair having a first transistor arranged to control current flow in the first feedback loop to maintain a voltage at the first interface of the resistor at substantially a constant voltage relative to an input voltage applied to the first input circuit and a second transistor arranged to control current flow for a first output; and a second differential pair having a third transistor arranged to control current flow in the second feedback loop to maintain a voltage at the second interface of the resistor at substantially a constant voltage relative to an input voltage applied to the second input circuit and a fourth transistor arranged to control current flow for a second output.

REFERENCES:
patent: 5307024 (1994-04-01), Metz et al.
patent: 2003/0052731 (2003-03-01), Kimura
Ismail et al., “Novel CMOS Linearised Balanced Output Transconductance Amplifier Based on Differential Pairs,” Frequenz Schiele und Schon GMBH, Berlin, DE, vol. 53, pp. 170-174, XP000920024.
Towers, “Balanced Transistor D.C. Amplifiers,” Wireless World, IPC Business Press Ltd., Haywards Heath, GB, vol. 74, pp. 269-274, XP001127064.

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