Title:
A DIGITAL-TO-ANALOG CONVERTER
Document Type and Number:
WIPO Patent Application WO/2020/257964
Kind Code:
A1
Abstract:
A digital-to-analog converter (DAC) is described for converting high resolution digital data to analog signal. The DAC employs a main-DAC for higher order bits, asub-DAC for lower order bits and voltage addition circuit to combine two outputs of the main-DAC and the sub-DAC together. The main-DAC comprises an impedance Z string in serial and the sub-DAC employs Z–2Z ladder structure with its drive reference voltage proportionally scaled down directly from the main-DAC. The main-DAC has intrinsic properties of good linearity and monotonicity, but needs more components and switches, while the structure of the sub-DAC is relatively simple, only needs a few components and switches, but has properties of bigger non-linearity. When they cascaded in serial, the non-linearity of the sub-DAC will scaled down accordingly, thus, the whole DAC will give a trade-off performance for high resolution data conversion.
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Inventors:
QIAO DONGHAI (CN)
QI MIN (CN)
SUN QUAN (CN)
WANG CHUNPEI (CN)
DING YANMING (CN)
RU CHANGHAI (CN)
SUN YU (CA)
QI MIN (CN)
SUN QUAN (CN)
WANG CHUNPEI (CN)
DING YANMING (CN)
RU CHANGHAI (CN)
SUN YU (CA)
Application Number:
PCT/CN2019/092517
Publication Date:
December 30, 2020
Filing Date:
June 24, 2019
Export Citation:
Assignee:
JIANGSU JITRI MICRO NANO AUTOMATION INST CO LTD (CN)
International Classes:
H03M1/68
Foreign References:
| CN109586726A | 2019-04-05 | |||
| CN104300984A | 2015-01-21 | |||
| CN204180056U | 2015-02-25 |
Attorney, Agent or Firm:
CENTRAL SOUTH WELL INTELLECTUAL PROPERTY OFFICE (CN)
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