Amplifier employing interleaved signals for PWM ripple suppression
First Claim
1. An amplifier comprising:
- an interleaved amplifier section receiving a modified input signal and providing an amplified output signal, where the interleaved amplifier section has a transfer characteristic GN corresponding to a first set of one or more phasing vectors;
an interleaved PWM section receiving the modified input signal and providing an interleaved pulse output signal, where the interleaved PWM section has a transfer characteristic GL corresponding to a second set of one or more phasing vectors that are different from the first set of one or more phasing vectors;
a combiner circuit;
a feedback circuit disposed to feedback at least a portion of the amplified output signal of the interleaved amplifier section to the summer circuit, where the further feedback circuit has a transfer characteristic HN;
a further feedback circuit disposed to feedback at least a portion of the interleaved pulse output signal of the interleaved PWM section to the summer circuit, where the feedback circuit has a transfer characteristic HL; and
where the combiner circuit generates the modified input signal by subtracting the output signal of the feedback circuit and the output signal of the further feedback circuit from an input signal that is to be amplified.
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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.
45 Citations
27 Claims
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1. An amplifier comprising:
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an interleaved amplifier section receiving a modified input signal and providing an amplified output signal, where the interleaved amplifier section has a transfer characteristic GN corresponding to a first set of one or more phasing vectors; an interleaved PWM section receiving the modified input signal and providing an interleaved pulse output signal, where the interleaved PWM section has a transfer characteristic GL corresponding to a second set of one or more phasing vectors that are different from the first set of one or more phasing vectors; a combiner circuit; a feedback circuit disposed to feedback at least a portion of the amplified output signal of the interleaved amplifier section to the summer circuit, where the further feedback circuit has a transfer characteristic HN; a further feedback circuit disposed to feedback at least a portion of the interleaved pulse output signal of the interleaved PWM section to the summer circuit, where the feedback circuit has a transfer characteristic HL; and where the combiner circuit generates the modified input signal by subtracting the output signal of the feedback circuit and the output signal of the further feedback circuit from an input signal that is to be amplified. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating an amplifier, the method comprising:
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generating primary interleaved PWM pulses in response to a modified input signal and one or more carrier signals; driving a power stage using the primary interleaved PWM pulses; generating secondary interleaved PWM pulse signals in response to the modified input signal and one or more further carrier signals; and generating the modified input signal from an input signal and the secondary interleaved PWM pulses. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An amplifier comprising:
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an interleaved amplifier section configured to receive a modified input signal and provide an amplified output signal, where the interleaved amplifier section has a transfer characteristic GN corresponding to one or more first phasing vectors; an interleaved PWM section configured to receive the modified input signal and provide an interleaved pulse output signal, where the interleaved PWM section has a transfer characteristic GL corresponding to one or more second phasing vectors; and one or more combiner circuits configured to generate the modified input signal based on the amplified output signal, the interleaved pulse output signal, and an input signal that corresponds to a signal that is to be amplified. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification