Acoustic resonator filter with electrically variable center frequency and bandwidth
AssigneeWestinghouse Electric Corp.
InventorChristopher R. Vale
Life of this patent
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Abstract
An acoustic resonator filter having at least one of electronically variable center frequency and bandwidth has a shunt coupling consisting of an inductor and voltage variable capacitor matrix. A pair of acoustic resonators each having a parallel inductor are connected to each other and to the shunt coupling network. One of a pair of voltage variable capacitor matrixes each having a center frequency command input voltage is connected to each acoustic resonator and an associated inductor. This circuit can be extended to provide more selectivity and attenuation.
Claims10
An acoustic resonator filter having at least one of electronically variable center frequency and electronically variable bandwidth comprising
- a) a shunt coupling network consisting of
- i) a first inductor and
- ii) a voltage variable capacitor matrix having a bandwidth command input voltage, the matrix connected to the first inductor and to ground;
- b) a pair of acoustic resonators each having a parallel inductor the resonators being connected to each other and to the shunt coupling network inductor;
- c) a pair of voltage variable capacitor matrixes each having a center frequency command input voltage, one such matrix being connected to each acoustic resonator;
- d) a second inductor connected to one variable capacitor matrix;
- and
- e) a third inductor connected to the other variable capacitor matrix.
Dependencies are inferred from the claim text.