System and method of shaping a power spectrum in PWM amplifiers
First Claim
Patent Images
1. A circuit device comprising:
- a data generator adapted to output a random pulse sequence having a particular spectral shape; and
a pulse edge control circuit to selectively apply a carrier suppression operation to at least one pulse-width modulated (PWM) signal in response to the random pulse sequence to produce at least one modulated PWM output signal;
wherein spectral energy associated with a PWM carrier of the modulated PWM output signal at a carrier frequency and associated harmonics is changed such that the modulated PWM output signal has a spectral shape defined by the particular spectral shape.
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Abstract
In a particular embodiment, a circuit device is disclosed that includes a data generator adapted to output a random pulse sequence having a particular spectral shape. The circuit device further includes a pulse edge control circuit to selectively apply a carrier suppression operation to at least one pulse-width modulated (PWM) signal in response to the random pulse sequence to produce at least one modulated PWM output signal. The spectral energy associated with a PWM carrier of the modulated PWM output signal at a carrier frequency and associated harmonics is changed such that the modulated PWM output signal has a spectral shape defined by the particular spectral shape.
61 Citations
22 Claims
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1. A circuit device comprising:
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a data generator adapted to output a random pulse sequence having a particular spectral shape; and a pulse edge control circuit to selectively apply a carrier suppression operation to at least one pulse-width modulated (PWM) signal in response to the random pulse sequence to produce at least one modulated PWM output signal; wherein spectral energy associated with a PWM carrier of the modulated PWM output signal at a carrier frequency and associated harmonics is changed such that the modulated PWM output signal has a spectral shape defined by the particular spectral shape. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A pulse edge control circuit comprising:
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an input to receive a random sequence having a particular spectral shape; and logic to selectively apply a carrier suppression operation to at least one PWM signal in response to receiving the random sequence to produce at least one modulated PWM output signal, the at least one modulated PWM output signal having an energy spectrum defined by the particular spectral shape. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method comprising:
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receiving at least one pulse-width modulated (PWM) input signal from a PWM source; receiving a random pulse sequence having a particular spectral shape from a data generator; and applying a carrier suppression operation to selectively phase shift or to selectively chop the received at least one PWM input signal according to values of the random pulse sequence to produce at least one modulated PWM output signal with a desired spectral shape as defined by the random pulse sequence. - View Dependent Claims (19, 20, 21, 22)
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Specification