Switching transducer driver
AssigneeCirrus Logic, Inc.
InventorsJohn P. Lesso, Douglas J. W. Macfarlane
Life of this patent
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Abstract
A switching transducer driver operable in: a first mode in which first and second output stage switches are controlled to generate a two-level output signal, wherein an impedance of the first output stage switch is substantially the same as an impedance of the second output stage switch; and a second mode in which the first and second output stage switches and a third switch are controlled to generate a three-level output signal, wherein an impedance of the third switch is substantially greater than the impedance of the first output stage switch and the second output stage switch.
Claims20
A switching transducer driver operable in:
- a first mode in which first and second output stage switches are controlled to generate a two-level output signal, wherein an impedance of the first output stage switch is substantially the same as an impedance of the second output stage switch;
- and
- a second mode in which the first and second output stage switches and a third switch are controlled to generate a three-level output signal, wherein an impedance of the third switch is substantially greater than the impedance of the first output stage switch and the second output stage switch;
- wherein the switching transducer driver is operable in a third mode in which an output of the switching transducer driver is clamped to a reference voltage, and wherein the switching transducer driver is configured to operate in the third mode if a parameter of the input signal is less than a second threshold.
A switching transducer driver operable in:
- a first mode in which first and second output stage switches are controlled to generate a two-level output signal, wherein an impedance of the first output stage switch is substantially the same as an impedance of the second output stage switch;
- and
- a second mode in which the first and second output stage switches and a third switch are controlled to generate a three-level output signal, wherein an impedance of the third switch is substantially greater than the impedance of the first output stage switch and the second output stage switch,
- wherein the switching transducer driver comprises control circuitry configured to select between the first mode and the second mode based on a parameter of an input signal to the switching transducer driver,
- wherein the control circuitry comprises modulator circuitry configured to receive the input signal and a carrier wave signal and to generate a modulated output signal based on the input signal and the carrier wave signal.
Dependencies are inferred from the claim text.