Driver circuitry for piezoelectric transducers
AssigneeCirrus Logic, Inc.
InventorsJohn Paul Lesso, Toru Ido
Life of this patent
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Abstract
The present disclosure relates to driver circuitry for driving a piezoelectric transducer. The circuitry comprises: a power supply; a reservoir capacitance; switch network circuitry; and control circuitry. The control circuitry is configured to control operation of the switch network circuitry so as to charge the reservoir capacitance from the power supply and to transfer charge between the reservoir capacitance and the piezoelectric transducer.
Claims20
Circuitry for driving a piezoelectric transducer based on an input signal, the circuitry comprising:
- a power supply;
- a reservoir capacitance;
- switch network circuitry;
- and
- control circuitry configured to control operation of the switch network circuitry so as to charge the reservoir capacitance from the power supply and to transfer charge between the reservoir capacitance and the piezoelectric transducer,
- wherein the control circuitry is further configured to control operation of the switch network to transfer charge from the power supply to the reservoir capacitance based on an indication of a level of the input signal,
- and wherein the circuitry further comprises look-ahead circuitry configured to receive the input signal and to output a signal indicative of the level of the input signal to the control circuitry.
Circuitry for driving a piezoelectric transducer based on an input signal, the circuitry comprising:
- a power supply;
- a reservoir capacitance;
- switch network circuitry;
- and
- control circuitry configured to control operation of the switch network circuitry so as to charge the reservoir capacitance from the power supply and to transfer charge between the reservoir capacitance and the piezoelectric transducer,
- wherein the control circuitry is further configured to control operation of the switch network to transfer charge from the power supply to the reservoir capacitance based on an indication of a level of the input signal,
- and wherein the circuitry further comprises envelope detector circuitry configured to receive the input signal and to output a signal indicative of an envelope of the input signal to the control circuitry.
Dependencies are inferred from the claim text.