System and method of altering a PWM carrier power spectrum
First Claim
1. A circuit device comprising:
- at least one input to receive a pulse-width modulated (PWM) signal;
at least one output to send a modulated PWM signal;
a pulse edge control circuit coupled between the at least one input and the at least one output, the pulse edge control circuit to receive the PWM signal via the at least one input and including a control input to receive a modulation control signal, the pulse edge control circuit adapted to modify the PWM signal to provide a modulated PWM signal with suppressed carrier power and associated harmonics to the at least one output based on the modulation control signal; and
a modulation sequence controller adapted to provide the modulation control signal via the control input, the modulation control signal to selectively control a sequence of the modification of the PWM signal to selectively alter an output power spectrum of the modulated PWM signal.
1 Assignment
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Accused Products
Abstract
In a particular embodiment, a circuit device includes an input to receive a pulse-width modulated (PWM) signal and an output to send a modulated PWM signal. The circuit device further includes a pulse edge control circuit coupled between the input and the output. The pulse edge control circuit receives the PWM signal via the input and includes a control input to receive a modulation control signal. The pulse edge control circuit is adapted to modify the PWM signal to provide the modulated PWM signal with suppressed carrier power and associated harmonics to the output based on the modulation control signal. The circuit device further includes a modulation sequence controller adapted to provide the modulation control signal via the control input. The modulation control signal selectively controls a sequence of the modification of the PWM signal to selectively alter an output power spectrum of the modulated PWM signal.
70 Citations
33 Claims
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1. A circuit device comprising:
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at least one input to receive a pulse-width modulated (PWM) signal; at least one output to send a modulated PWM signal; a pulse edge control circuit coupled between the at least one input and the at least one output, the pulse edge control circuit to receive the PWM signal via the at least one input and including a control input to receive a modulation control signal, the pulse edge control circuit adapted to modify the PWM signal to provide a modulated PWM signal with suppressed carrier power and associated harmonics to the at least one output based on the modulation control signal; and a modulation sequence controller adapted to provide the modulation control signal via the control input, the modulation control signal to selectively control a sequence of the modification of the PWM signal to selectively alter an output power spectrum of the modulated PWM signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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receiving a pulse-width modulated (PWM) signal; modifying the PWM signal to produce a modulated PWM signal with suppressed carrier power and associated harmonics; and selectively controlling a modification sequence associated with producing the modulated PWM signal to selectively alter a PWM carrier power spectrum to produce a modulated PWM output signal having at least one of a reduced peak carrier power and a reduced interference at particular frequencies. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A circuit device comprising:
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at least one input to receive a pulse width modulated (PWM) signal; a pulse edge control circuit coupled to the at least one input and adapted to phase-shift or chop the PWM signal to produce a modulated PWM signal with suppressed carrier power and associated harmonics; and a modulation sequence controller to selectively apply one or more modulation control sequences to a phase-shifting or chopping operation to selectively alter an output PWM power spectrum of the PWM signal and to provide a modulated PWM output signal to at least one output, the modulated PWM output signal having at least one of a reduced peak common mode power and a reduced interference at selected frequencies. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A circuit device comprising:
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a differential switching amplifier including at least one positive input and at least one negative input and a differential output coupled to a load; a pulse edge control circuit coupled to the at least one positive input and the at least one negative input of the switching amplifier, the pulse edge control circuit including a differential signal input to receive differential PWM signals and including a modulation control input to receive a modulation control signal, the pulse edge control circuit adapted to phase-shift or chop the differential PWM signals to produce a modulated PWM output signal with suppressed common mode carrier power and associated harmonics without altering a differential mode characteristic of the modulated PWM output signal; and a modulation sequence controller coupled to the modulation control input to selectively control a sequencing of the phase-shifting or chopping operation to selectively alter a common mode power spectrum of the modulated PWM output signal. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification