Apparatus for driving a mechanical resonator from a high impedan

Details Apparatus for driving a mechanical resonator from a high impedan Apparatus for driving a mechanical resonator from a high impedan

1990-04-12

1992-07-14

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330148, 330174, 358196, 358197, H03F 3191, H04N 562

Patent

active

051306697

ABSTRACT:
The present invention concerns a high impedance signal source driving a relatively low input impedance mechanical resonating device such as a ceramic filter having an input impedance which varies with frequency. The high impedance source is further loaded by a resonant circuit tuned to the center frequency of the mechanical resonating device. The skirts of the resonant tuned circuit decrease in impedance on both sides of the center frequency of interest substantially compensating for the change of circuit gain with frequency due to the change of input impedance with frequency of the ceramic filter.

REFERENCES:
patent: 2308258 (1943-01-01), Armstrong et al.
patent: 3054969 (1962-09-01), Harrison
patent: 3091659 (1963-05-01), Massman
patent: 4271433 (1981-06-01), Therault
patent: 4316220 (1982-02-01), Muterspaugh et al.
patent: 4376953 (1983-03-01), Naimpally
patent: 4410864 (1983-10-01), Muterspaugh et al.
patent: 4818959 (1989-04-01), Katoh
Sauerland et al, "Ceramic IF Filters for Consumer Products", IEEE Spectrum, Nov. 1968, pp. 112-126.

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