Amplifier employing interleaved signals for PWM ripple suppression
First Claim
1. An amplifier comprising:
- an interleaved PWM amplifier generating interleaved PWM pulses in response to a modified input signal and one or more carrier signals to drive a power stage of the interleaved PWM amplifier;
an interleaved PWM generator providing interleaved PWM pulses in response to the modified input signal and one or more further carrier signals; and
one or more feedback circuits responsive to an input signal and the interleaved PWM pulses of the interleaved PWM generator to generate the modified input signal.
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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
13 Claims
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1. An amplifier comprising:
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an interleaved PWM amplifier generating interleaved PWM pulses in response to a modified input signal and one or more carrier signals to drive a power stage of the interleaved PWM amplifier; an interleaved PWM generator providing interleaved PWM pulses in response to the modified input signal and one or more further carrier signals; and one or more feedback circuits responsive to an input signal and the interleaved PWM pulses of the interleaved PWM generator to generate the modified input signal. - View Dependent Claims (2, 3, 4, 5)
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6. An amplifier comprising:
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an interleaved PWM amplifier of interleave order NN>
1, where the interleaved amplifier generates interleaved PWM pulses in response to a modified input signal and one or more carrier signals to drive a power stage of the interleaved PWM amplifier;an interleaved PWM generator of interleave order NL>
1, where the interleaved PWM generator provides interleaved PWM pulses in response to the modified input signal and one or more further carrier signals;one or more feedback circuits combining an input signal and the interleaved PWM pulses of the interleaved PWM generator to generate the modified input signal. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification