Method and device for pulse width modulation
AssigneeInfineon Technologies AG
InventorChristoph Braun
Life of this patent
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Abstract
A method and a device are proposed for the conversion of a quantized signal into a pulse width modulated signal, wherein dependent on a signal value of the quantized signal in each case a pulse duration of a pulse is determined within a period of the pulse width modulated signal, in which the pulse width modulated signal assumes a first value, while in the remainder of the period it assumes a second value, and wherein a phase position of the pulse is varied within the period of the pulse modulated signal from period to period in such a manner that energy of the pulse width modulated signal is distributed across a broad frequency spectrum. In one case, this takes place by means of parallel switched SD modulators and a vector controller.
Claims26
A method for converting a quantized signal into a pulse width modulated signal having a frequency spectrum, the method comprising:
- determining a pulse duration of a pulse within a period of the pulse width modulated signal, wherein the determination is dependent on a signal value of the quantized signal and wherein the pulse width modulated signal assumes a first value during the pulse duration of the period and assumes a second value during a remaining duration of the period;
- and
- varying a phase position of the pulse within the period of the pulse modulated signal from period to period such that an energy of the pulse width modulated signal is distributed across the frequency spectrum of the pulse width modulated signal.
A device for converting a quantized signal into a pulse width modulated signal, comprising:
- control means for determining a specific pulse duration of a pulse within a period of the pulse width modulated signal, wherein the determination is dependent on a value of the quantized signal, and wherein the pulse width modulated signal assumes a first value during the pulse duration of the period and assumes a second value during a remaining duration of the period;
- wherein the control means is configured such that it varies a phase position of the pulse within the period of the pulse modulated signal from period to period such that an energy of the pulse width modulated signal is distributed across the frequency spectrum of the pulse width modulated signal.
An arrangement for converting an input signal into a pulse width modulated signal comprising:
- a quantizer configured to receive the input signal and produce a quantized signal;
- a device for converting the quantized signal into a pulse width modulated signal, the device having control means for determining a specific pulse duration of a pulse within a period of the pulse width modulated signal, wherein the determination is dependent on a value of the quantized signal, and wherein the pulse width modulated signal assumes a first value during the pulse duration of the period and assumes a second value during a remaining duration of the period;
- wherein the control means is configured such that it varies a phase position of the pulse within the period of the pulse modulated signal from period to period such that an energy of the pulse width modulated signal is distributed across the frequency spectrum of the pulse width modulated signal.
Dependencies are inferred from the claim text.