Transconductance amplifier

Details Transconductance amplifier Transconductance amplifier

1987-02-17

1988-02-02

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, H03F 345

Patent

active

047231106

ABSTRACT:
A transconductance amplifier comprising a voltage divider including two identical resistors (R.sub.o) connected between the bases (3, 4) of two first transistors (T.sub.o1, T.sub.o2) arranged as a differential pair, each having a first emitter area (e.sub.o). The junction point of said resistors (R.sub.o) is connected to the base of a second transistor (T.sub.1) having a second emitter area (2e.sub.1), whose emitter, like that of the first transistors (T.sub.o1, T.sub.o2), is connected to a current source (6). For a ratio between the second and the first emitter areas (2e.sub.1 ; e.sub.o) equal to 4:1 the difference between the output currents (I.sub.1, I.sub.3) of the first transistors (T.sub.o1, T.sub.o2) increases as a linear function of the input voltage over a range which is as large as possible.

REFERENCES:
patent: 4612513 (1986-09-01), Seevinck

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