sar-dac device and its working method
A device and comparator technology, which is applied in the field of SAR-DAC devices, can solve the problems of successive approximation analog-to-digital converters to be improved, and achieve the effects of reducing layout area, improving performance, and reducing capacitance matrix
Active Publication Date: 2021-09-07
SEMICON MFG INT (SHANGHAI) CORP +1
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Problems solved by technology
[0004] However, the performance of existing successive approximation analog-to-digital converters needs to be improved
Method used
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[0026] As mentioned in the background art, the performance of the SAR-DAC device formed by the prior art is poor.
[0027] A SAR-DAC device, please refer to figure 1 , including: two circuit units, each circuit unit includes: a comparator 100, a capacitance matrix unit 110 and a sampling switch.
[0028] Due to the use of multiple circuit units, the number of times of charge redistribution is reduced under the same number of comparisons, and the speed is improved.
[0029] However, for a five-bit precision data, 64 capacitors of 90 fF are used in one capacitance matrix unit 110 , and most of the layout area in the SAR-DAC device is occupied by the capacitance matrix unit 110 . The two circuits of circuit units make the SAR-DAC device have two capacitance matrix units 110, and the total area of the capacitance matrix is larger, resulting in a larger layout area in the SAR-DAC device and an increase in cost.
[0030] On this basis, the present invention provides a SAR-DAC ...
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A SAR-DAC device and its working method, the SAR-DAC device includes: a comparator, the comparator has a positive input terminal and a negative input terminal; a DAC core unit, the DAC core unit includes: a first capacitor, the first capacitor has a first Charge and discharge terminal; second capacitor, the second capacitor has a second charge and discharge terminal; current control discharge structure; current control discharge structure includes several current beam circuit units, each current beam circuit unit includes a first discharge input terminal and a second discharge input terminal Discharge input terminals, each first discharge input terminal is connected to the first charge and discharge terminal and the positive input terminal, and each second discharge input is connected to the second charge and discharge terminal and the input terminal; the current control discharge structure is suitable for using at least some of the The current beam circuit unit discharges the first capacitor via the first discharge input, and is further adapted to discharge the second capacitor via the second discharge input with at least a part of the current beam circuit unit. The performance of the SAR-DAC device is improved.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to a SAR-DAC device and a working method thereof. Background technique [0002] Due to the growing demand for high-quality multimedia and high-speed communications, digital-to-analog converter (DAC) designs are moving toward high precision, high sampling rates, and low power consumption. Among them, the design of low power consumption is particularly important for portable devices. [0003] The successive approximation digital-to-analog converter (SAR-DAC) is a well-recognized low-power DAC structure. Although the speed and accuracy of the approximation analog-to-digital converter is average, the successive approximation analog-to-digital converter is widely used because of its low power consumption and can meet most market needs. [0004] However, the performance of the existing successive approximation analog-to-digital converters still needs to be improved. SUMMARY OF THE I...
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IPC IPC(8): H03M1/38
CPCH03M1/72H03M1/089H03M1/802H03M1/462H03M1/742
Inventor 肖艳翁芊
Owner SEMICON MFG INT (SHANGHAI) CORP