Wide band amplifier

Details Wide band amplifier Wide band amplifier

1991-10-15

1993-10-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, H03F 345, H03G 330

Patent

active

052569837

ABSTRACT:
Disclosed is a wide band amplifier comprising a first differential connection circuit made of a first and a second transistor differentially interconnected, a second differential connection circuit made of a third and a fourth transistor differentially interconnected, and a level shift circuit interposingly provided between a load resistance and a power supply. The load resistance is connected to the collector of the first transistor. The bases of the first and the third transistors are supplied with a voltage for gain determination. Furthermore, the bases of the first and the third transistors are supplied with a predetermined operating voltage. The voltage of the level shift circuit is fed to the collector of the fourth transistor. In this setup, the voltage to the load resistance connected to the collector of the first transistor is varied depending on the magnitude of the current flowing through the fourth transistor.

REFERENCES:
patent: 3512096 (1970-05-01), Nagata et al.

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