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US 2015/0103877 A1Published application
Electro-magnetic interference reduction for switched signal systems
AssigneeMarvell World Trade Ltd.
InventorKapil Jain
Life of this patent
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Abstract
In one embodiment, a method receives a pulse width modulation signal. A value that is a function of the pulse width modulation signal is determined. The value is used to modulate a switching frequency of the pulse width modulation signal to generate a modulated pulse width modulation signal. The applied value reduces electro-magnetic interference from tones in the modulated pulse width modulation signal.
Claims21
1-20. (canceled)
A method comprising:
- receiving a pulse width modulation signal;
- determining an Nth-order derivative of the pulse width modulation signal based on a difference between two values at two consecutive indexes of an (N−1)th-order derivative of the pulse width modulation signal, wherein N is greater than one;
- determining a value that is based on the Nth-order derivative;
- and
- applying the value to modulate a switching frequency of the pulse width modulation signal to generate a modulated pulse width modulation signal, wherein the applied value reduces electro-magnetic interference in the modulated pulse width modulation signal.
2 more elements
An apparatus comprising:
- circuitry configured to receive a pulse width modulation signal;
- circuitry configured to determine an Nth-order derivative of the pulse width modulation signal based on a difference between two values at two consecutive indexes of an (N−1)th-order derivative of the pulse width modulation signal, wherein N is greater than one;
- circuitry configured to determine a value that is based on the Nth-order derivative;
- and
- circuitry configured to apply the value to modulate a switching frequency of the pulse width modulation signal to generate a modulated pulse width modulation signal, wherein the applied value reduces electro-magnetic interference in the modulated pulse width modulation signal.
2 more elements
Dependencies are inferred from the claim text.