Transconductance amplifier

Details Transconductance amplifier Transconductance amplifier

1993-12-10

1995-02-14

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

053898958

ABSTRACT:
A transconductance amplifier comprises first and second input transistors having base electrodes to which an input voltage (Vi) is applied. A constant current source is connected to the emitters of the input transistors. Outputs are derived from their collector electrodes. A tapped impedance having two or more segments (R0 to RN,RN to R0) is connected between the base electrodes of the input transistors. The base electrodes of a plurality of further transistors are connected to respective taps of the tapped impedance. The emitter areas of these further transistors increase from each end of the tapped impedance towards the center of the tapped impedance. The emitters of the further transistors are connected to the current source and the collectors are connected to a junction which is connected to means for computing the combined base currents of the further transistors from the combined collector currents at said junction. The computed current is supplied by a current mirror circuit to the center of the tapped impedance to pull up the voltage at the center. The tapped impedance can have an increased resistance without unduly loading a preceding stage.

REFERENCES:
patent: 4612513 (1986-09-01), Seevinck
patent: 4779059 (1988-10-01), Taki et al.
patent: 4951003 (1950-08-01), De Jager et al.

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