Method of converting digital signal to analog signal
First Claim
1. A method of converting a digital signal to an analog signal, comprising the steps of:
- providing a digital code having a plurality of bits including a starting bit and an ending bit;
outputting the digital code to a digital output port bit-by-bit, starting with the starting bit and ending with the ending bit, to produce a signal level at the output port that varies according to the value of the ongoing bit;
multiplying a unit of time by a weight of coding that represents the ongoing bit, so as to obtain an output time segment for the respective bit, said step of outputting the digital code including holding the signal level at the output port for said output time segment, and then shifting to a next ongoing bit; and
repeating said multiplying and holding successively for each successive bit of the digital code until the ending bit of the digital code has been processed, thereby to provide the analog signal converted from the digital signal at the output port.
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Abstract
A digital-to-analog conversion method includes outputting one priority bit of a digital signal to a digital output port to produce a respective output signal. An output time for the output signal is obtained by multiplying a unit of time by a weight of coding representing the significance of the bit, to define a period of time of maintaining the signal level at the output port before shifting to a next bit, and repeating the aforesaid steps for the successive bits. The output signal produced can be used to directly drive a power switching means for linear control of a power element, or integrated and filtered to provide a level analog output.
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Citations
5 Claims
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1. A method of converting a digital signal to an analog signal, comprising the steps of:
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providing a digital code having a plurality of bits including a starting bit and an ending bit;
outputting the digital code to a digital output port bit-by-bit, starting with the starting bit and ending with the ending bit, to produce a signal level at the output port that varies according to the value of the ongoing bit;
multiplying a unit of time by a weight of coding that represents the ongoing bit, so as to obtain an output time segment for the respective bit, said step of outputting the digital code including holding the signal level at the output port for said output time segment, and then shifting to a next ongoing bit; and
repeating said multiplying and holding successively for each successive bit of the digital code until the ending bit of the digital code has been processed, thereby to provide the analog signal converted from the digital signal at the output port. - View Dependent Claims (2, 3)
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4. A method of converting a digital signal to an analog signal, comprising the steps of:
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providing a digital code having a plurality of bits including a starting bit and an ending bit;
outputting the digital code to a digital output port bit-by-bit, starting with the starting bit and ending with an ending bit, to produce a signal level at the output port that varies according to the value of the ongoing bit;
multiplying a unit of time by a weight of coding that represents the ongoing bit, so as to obtain an output time segment for the respective bit, said step of outputting the digital code including holding the signal level at the output port for said output time segment, and then shifting to a next ongoing bit; and
repeating said multiplying and holding successively for each successive bit of the digital code, thereby to provide the analog signal, during the successive output time segments for the respective bits of the digital code, to have signal levels corresponding to successive bits of the digital code. - View Dependent Claims (5)
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Specification