Amplifier employing interleaved signals for PWM ripple supression
First Claim
1. An amplifier comprising:
- an interleaved PWM generator providing primary and secondary sets of interleaved PWM pulses in response to an input signal;
an interleaved PWM output stage responsive to corrected interleaved PWM pulses corresponding to the primary set of interleaved PWM pulses to generate an amplified PWM output signal;
an interleaved PWM corrector coupled between the interleaved PWM generator and the interleaved PWM output stage, the interleaved PWM corrector operable to receive the primary set of interleaved PWM pulses, and the interleaved PWM corrector responsive to one or more correction signals derived from one or more feedforward signals corresponding to the secondary set of interleaved PWM pulses to generate, from the received primary interleaved PWM pulses, the corrected interleaved PWM pulses for use by the interleaved PWM output stage.
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Accused Products
Abstract
An amplifier having improved distortion characteristics is set forth. The amplifier includes an interleaved PWM amplifier that generates interleaved PWM pulses in response to a modified input signal and one or more carrier signals. The interleaved PWM pulses of the amplifier are used to drive a power stage, such as an opposed current power stage. The amplifier also includes an interleaved PWM generator that provides interleaved PWM pulses in response to the modified input signal and one or more further carrier signals. The carrier signals used by the PWM generator may differ in phase from the carrier signals used by the interleaved PWM amplifier to generate its interleaved PWM pulses. One or more feedback circuits are employed in the generation of the modified input signal. More particularly, the feedback circuit(s) generates the modified input signal based on an input signal that is to be amplified and the interleaved PWM pulses of the interleaved PWM generator.
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Citations
20 Claims
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1. An amplifier comprising:
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an interleaved PWM generator providing primary and secondary sets of interleaved PWM pulses in response to an input signal; an interleaved PWM output stage responsive to corrected interleaved PWM pulses corresponding to the primary set of interleaved PWM pulses to generate an amplified PWM output signal; an interleaved PWM corrector coupled between the interleaved PWM generator and the interleaved PWM output stage, the interleaved PWM corrector operable to receive the primary set of interleaved PWM pulses, and the interleaved PWM corrector responsive to one or more correction signals derived from one or more feedforward signals corresponding to the secondary set of interleaved PWM pulses to generate, from the received primary interleaved PWM pulses, the corrected interleaved PWM pulses for use by the interleaved PWM output stage. - View Dependent Claims (2, 3, 4, 5)
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6. An amplifier comprising:
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an interleaved PWM generator providing primary and secondary sets of interleaved PWM pulses in response to an input signal; a feedforward circuit providing one or more feedforward signals derived from the secondary set of interleaved PWM pulses; an interleaved PWM output stage responsive to corrected interleaved PWM pulses corresponding to the primary set of interleaved PWM pulses to generate an amplified PWM output signal; a feedback circuit providing one or more feedback signals derived from the amplified PWM output signal; an interleaved PWM corrector coupled between the interleaved PWM generator and the interleaved PWM output stage, the interleaved PWM corrector operable to receive the primary set of interleaved PWM pulses, and the interleaved PWM corrector responsive to one or more correction signals derived from the one or more feedforward signals and the one or more feedback signals to generate, from the received primary interleaved PWM pulses, the corrected interleaved PWM pulses for use by the interleaved PWM output stage. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. An amplifier comprising:
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an interleaved PWM generator providing a primary set of interleaved PWM pulses and a secondary set of interleaved PWM pulses in response to an input signal; an interleaved PWM corrector coupled with the interleaved PWM generator, the interleaved PWM corrector operable to generate a corrected primary set of interleaved PWM pulses by adjustment of a width of pulses included in the primary set of interleaved PWM pulses based on a correction signal derived from the secondary set of interleaved PWM pulses; and an interleaved PWM output stage coupled with the interleaved PWM corrector, the interleaved PWM output stage operable to generate an amplified PWM output signal using the corrected primary set of interleaved PWM pulses received from the interleaved PWM corrector. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification