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Title:
A MULTI-STAGE HYBRID ANALOG-TO-DIGITAL CONVERTER
Document Type and Number:
WIPO Patent Application WO/2019/144419
Kind Code:
A1
Abstract:
A hybrid Analog-to-Digital Converter (ADC) has multiple stages. A first stage and a final stage each use a Successive-Approximation Register (SAR) ADC to generate the Most-Significant-Bits (MSBs) and the Least-Significant-Bits (LSBs) over successive internal cycles. Middle stage (s) use a faster flash ADC with multiple comparators in parallel to generate the middle binary bits, which are then re-converted by a Digital-to-Analog Converter (DAC) and subtracted from the stage's input analog voltage to generate a difference that is amplified by a residual amplifier that outputs an amplified voltage to the next stage. The first stage also has this multiplying DAC structure to convert the MSBs to an amplified voltage to the first of the middle stages. Finally, digital error correction logic removes redundant binary bits between stages. Initial and final SAR stages of 4 and 8 bits with a 4-bit middle stage provide a hybrid ADC of 14-bit precision.

Inventors:
GUO, Huimin (1/F Photonics Centre, 2 Science Park East Avenue Hong Kong Science Park, Shatin, Hong Kong, Kong, CN)
CHEN, Lu (1/F Photonics Centre, 2 Science Park East Avenue Hong Kong Science Park, Shatin, Hong Kong, Kong, CN)
WAN, Kam Chuen (1/F Photonics Centre, 2 Science Park East Avenue Hong Kong Science Park, Shatin, Hong Kong, Kong, CN)
Application Number:
CN2018/074509
Publication Date:
August 01, 2019
Filing Date:
January 30, 2018
Export Citation:
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Assignee:
HONG KONG APPLIED SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE COMPANY LIMITED (5/F Photonics Centre, 2 Science Park East Avenue,Hong Kong Science Park, Shati, N.T. Hong Kong, Kong, CN)
International Classes:
H03M1/38
Foreign References:
US9866233B12018-01-09
US9483028B12016-11-01
KR101435978B12014-09-02
US9030344B22015-05-12
CN104124969A2014-10-29
Attorney, Agent or Firm:
CHINA TRUER IP (Room 401, Floor 4 Zhongdian Difu Building, Zhenhua Road, Fuqiang Community, Huaqiang North Street, Futian Distric, Shenzhen Guangdong 1, 518031, CN)
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