US 12,489,420 B2 · Tunable ferroelectric acoustic resonator structure

Abstract

A ferroelectric acoustic resonator structure is provided. The tunable ferroelectric acoustic resonator structure includes a pair of ferroelectric acoustic resonator networks coupled in parallel between a signal input and a signal output. The ferroelectric acoustic resonator networks are tuned by a pair of pulse voltages to resonate in a desired series resonance frequency. However, the pair of pulse voltages can change an equivalent capacitance to therefore cause a parallel resonance frequency of the tunable ferroelectric acoustic resonator structure to shift. Herein, the pair of pulse voltages are determined to cause one of the ferroelectric acoustic resonator networks to increase the equivalent capacitance and to cause another one of the ferroelectric acoustic resonator networks to decrease the equivalent capacitance by an equal amount. As a result, it is possible to keep the overall equivalent capacitance, and therefore the parallel resonance frequency, of the tunable ferroelectric acoustic resonator structure unchanged.

Claims19

Dependent claims

A tunable ferroelectric acoustic resonator structure comprising:

a resonator network configured to present an equivalent capacitance between a signal input and a signal output in a parallel resonance frequency, the resonator network comprising:
a first ferroelectric acoustic resonator network configured to cause a first variation in the equivalent capacitance in response to receiving a first pulse voltage;
and
a second ferroelectric acoustic resonator network configured to cause a second variation in the equivalent capacitance in response to receiving a second pulse voltage;
and
a control circuit configured to:
determine the first pulse voltage and the second pulse voltage such that the first variation cancels the second variation to thereby keep the equivalent capacitance unchanged;
and
apply the determined first pulse voltage and the determined second pulse voltage to the first ferroelectric acoustic resonator network and the second ferroelectric acoustic resonator network, respectively.

6 more elements

A resonator network configured to resonate at a series resonance frequency to pass a signal from a signal input to a signal output and present an equivalent capacitance between the signal input and the signal output in a parallel resonance frequency, the resonator network comprising:

a first ferroelectric acoustic resonator network configured to:
receive a first pulse voltage for tuning the first ferroelectric acoustic resonator network to the series resonance frequency;
and
cause a first variation in the equivalent capacitance in response to receiving the first pulse voltage;
and
a second ferroelectric acoustic resonator network configured to:
receive a second pulse voltage for tuning the second ferroelectric acoustic resonator network to the series resonance frequency;
and
cause a second variation in the equivalent capacitance in response to receiving the second pulse voltage;
wherein the first pulse voltage and the second pulse voltage are determined to cause the first variation to cancel the second variation to thereby keep the equivalent capacitance unchanged.

7 more elements

Dependencies are inferred from the claim text.

Tunable ferroelectric acoustic resonator structure

Life of this patent

Tunable ferroelectric acoustic resonator structure

Life of this patent

Abstract

Claims19