Frequency-characteristic switchable buffer circuit
First Claim
1. A frequency-characteristic switchable buffer circuit, comprising:
- an amplifying stage;
a parallel resonance circuit which serves as an output load of the amplifying stage;
a frequency trap circuit connected between an input of the amplifying stage and a reference potential point; and
a frequency switching voltage generator to selectively generate one of a first switching voltage and a second switching voltage; and
wherein the parallel resonance circuit parallel-resonates at a first frequency when the first switching voltage is supplied thereto and parallel-resonates at a second frequency different from the first frequency when the second switching voltage is supplied thereto, and the frequency trap circuit comprises a series circuit comprised of a diode and a capacitor, and series-resonates at the second frequency when the first switching voltage is supplied thereto and series-resonates at the first frequency when the second switching voltage is supplied thereto.
1 Assignment
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Accused Products
Abstract
The frequency-characteristic switchable buffer circuit includes an amplifying stage, a parallel resonance circuit which serves as an output load of the amplifying stage, a frequency trap circuit electrically connected between the input of the amplifying stage and a reference potential point, and a frequency switching voltage generator for selectively generating a first switching voltage or a second switching voltage. The parallel resonance circuit parallel-resonates at a first frequency when the first switching voltage is supplied thereto. When the second switching voltage is supplied thereto, the parallel resonance circuit parallel-resonates at a second frequency. The frequency trap circuit comprises a series circuit made up of a diode and a capacitor. When the first switching voltage is supplied to the frequency trap circuit, the frequency trap circuit series-resonates at a frequency lower than the first frequency. When the second switching voltage is supplied thereto, it series-resonates at any of frequencies lying within a 1700 MHz band, which is higher than the second frequency.
9 Citations
6 Claims
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1. A frequency-characteristic switchable buffer circuit, comprising:
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an amplifying stage;
a parallel resonance circuit which serves as an output load of the amplifying stage;
a frequency trap circuit connected between an input of the amplifying stage and a reference potential point; and
a frequency switching voltage generator to selectively generate one of a first switching voltage and a second switching voltage; and
wherein the parallel resonance circuit parallel-resonates at a first frequency when the first switching voltage is supplied thereto and parallel-resonates at a second frequency different from the first frequency when the second switching voltage is supplied thereto, and the frequency trap circuit comprises a series circuit comprised of a diode and a capacitor, and series-resonates at the second frequency when the first switching voltage is supplied thereto and series-resonates at the first frequency when the second switching voltage is supplied thereto. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification