Digital analog converting method and system based on pressure-frequency conversion
Title:
Digital analog converting method and system based on pressure-frequency conversion
Application Number:
200510012068
Application Date:
2005/07/01
Announcement Date:
2005/12/21
Pub. Date:
2007/09/05
Publication Number:
1710622
Announcement Number:
100336085
Grant Date:
2007-9-5
Granted Pub. Date:
2007-9-5
ApplicationType:
Invention
State/Country:
11[China|beijing]
IPC:
G08C 19/36, G08C 19/16, G01D 3/00
Applicant(s):
Tsinghua Univ.
Inventor(s):
Pang Hao, Wang Zanji
Key Words:
pressure-frequency conversion, digital analog converting, method, system
Abstract:
Through voltage-frequency conversion, the method converts analog voltage to frequency of digital impulse signal linearly. Then, through opto-electronic isolation transmission, electronic jumping number of impulse signal is determined in continuous short time interval. Finally, through filtering and stepping-down frequency obtains A/D conversion of sampled data. The system is composed of voltage-frequency conversion circuit, opto-electronic isolation circuit, counting circuit, digital filtering and stepping-down frequency circuit, and data interface connected in series. Features are: isolated measurement of signal, raised precision of A/D conversion caused by first order oversampling characteristic utilized in counting process, and linear phase characteristic to ensure undistorted sampled wave form.
Claim:
Priority:
PCT:
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