Intermediate frequency amplifier circuit

Details Intermediate frequency amplifier circuit Intermediate frequency amplifier circuit

1994-04-28

1995-08-29

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330306, 330174, H03F 3191

Patent

active

054464153

ABSTRACT:
In an intermediate frequency amplifier circuit having a crystal filter and a transistor amplifier, a tuning circuit including a coil and a capacitor is provided therebetween, and a current feedback resistor and a voltage feedback resistor are connected to the amplifying transistor. The resistance component of impedance is matched between the crystal filter and the amplifier by suitably selecting values of the resistors. Further, the reactance component of the impedance is matched therebetween by suitably selecting values of the coil and the capacitor. Thus, it is possible to obtain impedance matching between the crystal filter and the amplifier without degradation of NF and hence S/N ratio due the thermal noise caused by resistance elements in a conventional resistive attenuator which is conventionally used for impedance matching.

REFERENCES:
patent: 3375456 (1968-03-01), Frisch
patent: 3727154 (1973-04-01), Dailing et al.
patent: 4227156 (1980-10-01), Mattfeld
patent: 4268807 (1981-05-01), Spence

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