dac circuit structure and resistor divider dac
A technology of circuit structure and resistance voltage division, applied in electrical components, digital-to-analog converters, physical parameter compensation/prevention, etc., can solve the problem of reducing integral nonlinearity, differential nonlinearity, and large differences in parasitic resistance of wiring metals in digital-to-analog converters And other issues
Active Publication Date: 2021-04-06
SUZHOU RIGOL PRECISION ELECTRIC TECH
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Problems solved by technology
The switches arranged in parallel lead to a large difference in the parasitic resistance of the wiring metal between the switch and the resistor string, which greatly reduces the integral nonlinearity and differential nonlinearity of the digital-to-analog converter.
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[0042] In order to facilitate the understanding of the present invention, and to make the above objects, features and advantages of the present invention more obvious and understandable, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description numerous specific details are set forth in order to provide a full understanding of the invention, and preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. The present invention can be implemented in many ways other than those described here, and those skilled in the art can make similar improvements without departing from the connota...
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The invention relates to a DAC layout structure and a resistance voltage-dividing DAC. A DAC layout structure includes: a resistor array, including a first resistor string and a second resistor string connected in series, wherein the first resistor string and the second resistor string each include a plurality of resistors connected in series, and each resistor is provided with a tap node The first switch array is spaced apart from the resistor array, the first switch array includes at least one first switch circuit, and the first switch circuit includes at least multiple pairs of first-stage first switches; the second switch array is spaced apart from the resistor array, The second switch array includes at least one second switch circuit, and the second switch circuit includes at least a plurality of pairs of first-stage second switches; wherein, the first switch array and the second switch array are arranged symmetrically with respect to the resistor array, reducing the first switch array . The large difference between the parasitic resistance of the wiring metal between the second switch array and the resistor array can significantly improve the integral nonlinearity, differential nonlinearity and other indicators of the DAC.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a DAC circuit structure and a resistance-dividing DAC. Background technique [0002] With the rapid development of digital electronic technology, digital products are becoming more and more common in people's lives, which also makes digital-to-analog converters (DAC, Digital to analog converter) more and more widely used in digital products. The function of the digital-to-analog converter is to convert digital quantities into analog quantities, that is, input a set of digital signals, and output an analog signal of voltage or current. [0003] The performance of the digital-to-analog converter has a huge relationship with the layout of the layout. The quality of the layout directly affects the performance of the digital-to-analog converter, such as nonlinearity, spurious-free dynamic range (SFDR), monotonicity and other indicators. [0004] In general DAC layout, sw...
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IPC IPC(8): H03M1/06H03M1/66
CPCH03M1/0617H03M1/66
Inventor 马换强王悦王铁军李维森
Owner SUZHOU RIGOL PRECISION ELECTRIC TECH