Band-pass filter and gain stage
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United States of America Patent
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May 19, 1981
Grant Date -
N/A
app pub date -
Jul 13, 1978
filing date -
Jul 13, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A band-pass filter and gain stage which produces a desired passband at a preselected center frequency. The present invention can be characterized as being a very passive frequency door whose output is lightly coupled to a broad band frequency amplifier having a high gain. The present invention includes an input connected to an input impedance stage, which is connected to a monolithic filter stage, which is connected to a second impedance stage, which is connected to a gain stage, which, in turn, is connected to an output terminal. A piezoelectric quartz crystal monolithic filter or a piezoelectric ceramic monolithic filter can be employed depending on the width desired for the passband response.
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