Tuned RF amplifier

Details Tuned RF amplifier Tuned RF amplifier

1996-07-12

1998-08-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including d.c. feedback bias control for stabilization

330294, H03F 134

Patent

active

057932557

ABSTRACT:
A tuned radio frequency (RF) amplifier includes serially connected input and output common emitter amplifiers with closed ac and dc loops for maintaining high input impedance and low output impedance. The closed ac loop includes a parallel resonant circuit which is connected to the input and capacitively coupled to the output and across which a small signal appears as the difference between the input and output signals. The collector of the input amplifier transistor is maintained at a constant voltage, thereby minimizing any Miller Effect feedback capacitance, and, therefore, any RF degeneration, at the input.

REFERENCES:
patent: 3151301 (1964-09-01), Bettin
patent: 4074241 (1978-02-01), Kranz
patent: 5218323 (1993-06-01), Ohno

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