Surface-acoustic-wave parametric device
AssigneeClarion Co., Ltd.
InventorsShoichi Minagawa, Takeshi Okamoto
Life of this patent
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Abstract
A surface-acoustic-wave parametric device includes in that a plurality of pumping electrodes arranged along a propagation path of surface acoustic wave. Values of DC bias voltages to be applied to the respective pumping electrodes for forming parametric interaction regions, or values of pumping voltages to be applied to the pumping electrodes, are differentiated so as to correspond to a desired frequency characteristic.
Claims19
A surface-acoustic-wave parametric device which comprises:
- a laminate which includes a semiconductor layer and a piezoelectric layer;
- means for propagating a surface acoustic wave along a path in said laminate;
- a plurality of spaced pumping electrodes provided along said surface-acoustic-wave propagating path in said laminate;
- means for applying pumping voltages to said pumping electrodes;
- and
- means for applying DC bias voltages of different, predetermined values to respective said pumping electrodes, said DC bias voltage values being selected so that an output frequency characteristic of said device corresponds to the impulse response thereof.
A surface-acoustic-wave parametric device which comprises:
- a laminate which includes a semiconductor layer and a piezoelectric layer;
- means for propagating a surface acoustic wave along a path in said laminate;
- a plurality of spaced pumping electrodes provided along said surface-acoustic-wave propagating path in said laminate;
- means for applying DC bias voltages to said pumping electrodes;
- and
- means for applying AC pumping voltages of different, predetermined values to respective said pumping electrodes, said predetermined pumping voltage values being selected so that an output frequency characteristic of said device corresponds to the impulse response thereof.
A method of adjusting the frequency response of a surface-acoustic-wave device which includes a laminate having a semiconductor layer and a piezoelectric layer, means for propagating a surface acoustic wave along a path in said laminate, and a plurality of spaced pumping electrodes provided along said path, comprising the steps of applying an AC pumping voltage to each said pumping electrode, applying a respective DC bias voltage to each said pumping electrode, and selecting said DC bias voltages so that an output frequency characteristic of said device is approximately equivalent to the impulse response thereof.
A method of adjusting the frequency response of a surface-acoustic-wave device which includes a laminate having a semiconductor layer and a piezoelectric layer, means for propagating a surface acoustic wave along a path in said laminate, and a plurality of spaced pumping electrodes provided along said path, comprising the steps of applying a DC bias voltage to each said pumping electrode, applying a respective AC pumping voltage to each said pumping electrode, and selecting said AC pumping voltages so that an output frequency characteristic of said device is approximately equivalent to the impulse response thereof.
Dependencies are inferred from the claim text.