Input circuit for high-frequency amplifiers

Details Input circuit for high-frequency amplifiers Input circuit for high-frequency amplifiers

1989-07-10

1990-09-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330301, 330311, H03F 304

Patent

active

049566156

ABSTRACT:
In an input circuit for high-frequency amplifiers having four transistors of the same conductivity type, the emitters of the first and second transistors (T1, T2) are connected to a reference point (M). The base of the first transistor (T1) forms the input (A) of the circuit and the base of the second transistor (T2) is connected to the collector of the first transistor (T1). The collector of the first transistor (T1) is connected to the emitter of the third transistor (T3) and the collector of the second transistor (T2) to the emitter of the fourth transistor (T4). The bases of the third and fourth transistors (T3, T4) are connected to one another, and at least one of the collectors of the third or fourth transistors (T3, T4) is connected to a current supply (I3, I4).

REFERENCES:
patent: 4028631 (1977-06-01), Ahmed
patent: 4049977 (1977-09-01), Radovsky

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