FPGA-based Precision Frequency/Duty Cycle Co-Measurement System Design
碩士 === 崑山科技大學 === 電子工程研究所 === 98 === This paper proposes to use FPGA to design a super-precision, wide measurement range And Automatically convert the input signal frequency and duty cycle measurement of simultaneous measurement technique. In the frequency measurement can be divided into High-freque...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2010
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/05774404073024043745 |
| Summary: | 碩士 === 崑山科技大學 === 電子工程研究所 === 98 === This paper proposes to use FPGA to design a super-precision, wide measurement range And Automatically convert the input signal frequency and duty cycle measurement of simultaneous measurement technique. In the frequency measurement can be divided into High-frequency and low frequency measurement About high-frequency measurement is used reciprocal counting Frequency Measurement, And Low-frequency measurement is the measurement method by measuring cycle. Frequency measurements in the 100MHz frequency stable reference signal. Stable reference frequency to 100MHz frequency measurement. Precision will reach 10ns. The measurement frequency can be lower than the sub-Hz. Reference frequency can change the highest frequency of measurement. If you use Spartan3 FPGA can achieve more than 200MHz or Virtex4-5 FPGA can reach more than 400MHz. Duty cycle synchronization algorithm using statistical measures. Reference frequency of 100MHz for resolution to 0.0000001%. About High-frequency duty-cycle of the random number generator used to reduce the error.
|
|---|