Digital to analog converter with an intra-string switching network
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 comprising non-current carrying switches configured to provide at least one least significant bit, LSB, transition at the output node in response to a sensed change across the first switching network; and
a control circuit coupled to a reference impedance, and configured to provide code dependent compensation for, or control of, variances in a response of switches within the DAC relative to the reference impedance.
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Abstract
In an example, a multistring DAC is described and includes at least two DAC stages. Each DAC stage includes a string of impedance elements and a switching network. In one configuration, the multi-string DAC is configured to use the voltage change at terminals of a first string separately to the voltage drop across a first switching network that couples the first and second strings to provide an analog output in response to a digital input to the DAC.
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Citations
39 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 comprising non-current carrying switches configured to provide at least one least significant bit, LSB, transition at the output node in response to a sensed change across the first switching network; and a control circuit coupled to a reference impedance, and configured to provide code dependent compensation for, or control of, variances in a response of switches within the DAC relative to the reference impedance. - 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, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method of converting a digital input signal to a corresponding analog output, the method comprising:
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Providing a digital bit stream to a digital to analog converter, DAC, the DAC comprising a first string with a plurality of impedance elements, a second string with a plurality of impedance elements and a first switching network; Providing a second switching network comprising non-current carrying switches; In response to the digital bit stream 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 and using the second switching network to provide at least one least significant bit, LSB, transition at the output node in response to a sensed change across the first switching network; and providing code dependent compensation for, or control of, variances in a response of switches within the DAC relative to a reference impedance. - View Dependent Claims (39)
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Specification