System and Method of Shaping a Power Spectrum in PWM Amplifiers
First Claim
1. A circuit comprising:
- an input terminal for receiving a 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 pulse sequence to produce at least one modulated PWM output signal;
wherein spectral energy associated with a PWM carrier of the at least one 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.
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Citations
24 Claims
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1. A circuit comprising:
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an input terminal for receiving a 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 pulse sequence to produce at least one modulated PWM output signal; wherein spectral energy associated with a PWM carrier of the at least one 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)
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9. A circuit comprising:
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a data generator including a signal input to a signal transfer function, a noise input to a noise transfer function, and an output for providing a bit sequence, the signal input configured to receive a substantially constant input signal, the noise input configured to receive a second input signal; a logic circuit to selectively apply a carrier suppression operation to at least one PWM signal in response to receiving the bit sequence to produce at least one modulated PWM output signal, the at least one modulated PWM output signal having a desired spectral shape. - View Dependent Claims (10, 11, 12, 14, 15, 16, 17, 18, 19, 20)
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21. A method comprising:
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receiving at least one pulse-width modulated (PWM) signal from a PWM source; receiving a bit sequence having a particular spectral shape from a data source; and selectively applying a carrier suppression operation to at least one PWM signal according to the bit sequence to produce at least one modulated PWM output signal with a desired spectral shape. - View Dependent Claims (22, 23, 24)
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Specification