High-precision modular converting card with effective accuracy more than 20 digits
Title：
High-precision modular converting card with effective accuracy more than 20 digits
Application Number：
 02146313
Application Date：
 2002/10/24
Announcement Date：
 2003/03/26
Pub. Date：
Publication Number：
 1405980
Announcement Number：
 1202622
Grant Date：
 2005-5-18
Granted Pub. Date：
 2005-5-18
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 H03M 1/12, H03M 1/06
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Yu Qingguang, Fang Jie
Key Words：
 High-precision, modular converting card, effective accuracy, 20 digits
Abstract：
 The invention features in that the coverter comprises own A/D converter with the anaglog signal being isolated from the digital signal, the analog DC/DC power source module for supplying power to the angle circuit and the improved filtering circuit. Meanwhile, the converter also comprises the reference level chip in high accuracy connected to the high accuracy conversion part, the digital DC/DC power source module for supplying power to the digital circuit, and the temperature compensation crystal oscillator in high accuracy. The D/A converter system through the isolated optical coupling chip can be connected to the microprocessor. The microprocessor through serial port of PCI interface communicates to PCs. The converter can perform 24 digits conversion for the standard analog signal in 0-5V, 4-20mA.
Claim：
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PCT：
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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
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