MULTIPLE STRING DIGITAL TO ANALOG CONVERTER
First Claim
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1. A multistring digital to analog converter, DAC, comprising:
- a first string with a plurality of impedance elements;
a second string with a plurality of impedance elements;
a first switching network adapted to couple a voltage produced across at least one of the impedance elements in the first string across the second string in response to a digital input signal, said digital signal comprising a digital bit stream, the impedance elements in the second string configured to produce voltages in response to current passing from the first string through the first switching network to the second string to produce a corresponding analog signal to said digital input signal to an output node;
a second switching network providing multiple switched paths which compensate for impedance effects of the second string and providing multiple state changes at the output node.
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Abstract
A multi-string DAC is described and comprises at least two DAC stages. Each DAC stage comprises a string of impedance elements and a switching network. In one configuration, the DAC comprises a first and second switching network, the second switching network providing multiple switched paths which compensate for impedance effects of the second string and provides multiple state changes at the output node of the DAC.
15 Citations
30 Claims
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1. A multistring digital to analog converter, DAC, comprising:
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a first string with a plurality of impedance elements; a second string with a plurality of impedance elements; a first switching network adapted to couple a voltage produced across at least one of the impedance elements in the first string across the second string in response to a digital input signal, said digital signal comprising a digital bit stream, the impedance elements in the second string configured to produce voltages in response to current passing from the first string through the first switching network to the second string to produce a corresponding analog signal to said digital input signal to an output node; a second switching network providing multiple switched paths which compensate for impedance effects of the second string and providing multiple state changes at the output node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of converting a digital input signal to a corresponding analog output, the method comprising
Providing a digital bit stream to a digital to analog converter, DAC, the DAC comprising at least a first string with a plurality of impedance elements and a second string with a plurality of impedance elements and a first switching network coupled to each of the first string and the second string; -
Using the first switching network to couple a voltage produced across at least one of the impedance elements in the first string across the second string in response to the digital bit stream of the digital input signal, Using the impedance elements in the second string to produce voltages in response to current passing from the first string through the first switching network to the second string to produce a corresponding analog signal to said digital input signal to an output node of the DAC, Providing a second switching network providing multiple switched paths which compensate for impedance effects of the second string and provides multiple state changes at the output node. - View Dependent Claims (28, 29, 30)
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Specification