Low noise ultra high frequency amplifier having automatic gain c

Details Low noise ultra high frequency amplifier having automatic gain c Low noise ultra high frequency amplifier having automatic gain c

1987-06-22

1988-06-28

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

330296, 330285, H03F 304, H03G 310

Patent

active

047542330

ABSTRACT:
A radio frequency amplifier includes a bipolar and a field effect transistors (FET) which are cascoded for efficient operation and simultaneous gain control. Bias circuitry is connected to the control electrode of the FET to stabilize the output bias thereof. Negative feedback circuitry is connected between the output electrode of the FET and the control electrode of the bipolar transistor to stabilize the other bias levels within the circuitry. An AGC circuit is connected to the feedback circuitry to provide an automatic gain control function.

REFERENCES:
patent: 4587495 (1986-05-01), Osawa et al.

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