Selective amplifier

Details Selective amplifier Selective amplifier

1979-11-20

1981-12-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330293, 330306, H03F 3193

Patent

active

043062008

ABSTRACT:
A selective amplifier whose gain characteristic is rendered approximately uniform over the entire frequency band to be amplified with no degradation in the S/N ratio. The amplifier consists of a band-pass filter and an amplifying element, in which a resistor for eliminating the ripples in the transmission characteristic of the filter is constituted with a feed back resistor for the amplifying element, the coil for the parallel resonance circuit in the filter is constituted as an auto-transformer and the capacitor in the serial resonance circuit of said filter is formed with the capacitance of a capacitive antenna respectively to thereby improve the S/N ratio. The amplifier is suitable to be used at the top of the high frequency stages in a radio receiver.

REFERENCES:
patent: 3164780 (1965-01-01), Ranky

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