Circuitry arrangement for the elimination of spurious response i

Details Circuitry arrangement for the elimination of spurious response i Circuitry arrangement for the elimination of spurious response i

1991-04-12

1993-03-16

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330306, H03F 3191

Patent

active

051948265

ABSTRACT:
The invention relates to a circuitry arrangement by means of which it is possible to suppress frequency components which cause spurious response in the intermediate frequency amplifier in a radio telephone receiver. The amplifier produces not only the input signal frequency but also harmonic frequencies of this frequency, in which case some harmonic frequency of the frequency component which causes spurious response is the same as the intermediate frequency. In the circuitry, between the signal path and the circuit ground, there is a circuit which is in series resonance at the frequency of the frequency component which causes spurious response, in which case a signal of this frequency is strongly attenuated, and the circuit is in parallel resonance at the intermediate frequency, in which case attenuation of a signal of this frequency is slight. It is possible to select an intermediate-frequency which is lower than the reception band multiplied by two, so that even strict requirements set on spurious response can be satisfied.

REFERENCES:
patent: 3585519 (1971-06-01), Burgess
patent: 3860881 (1975-01-01), Etherington et al.
patent: 4464636 (1984-08-01), Dobrovolny
patent: 4601062 (1986-07-01), Hettiger
patent: 4743873 (1988-05-01), Schultz et al.
Transistor Televison Picture IF Double Tuned Amplifiers by H. C. Lee. May 1959, pp. 25-32.
Patent Abstracts of Japan; High Frequency Amplifier JP-A-02-05809; Matsushita Electric Ind. Co., Ltd., Feb. 28, 1990.

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