Circuit capable of realizing high resolution for measuring frequency and time
A high-resolution, time-measurement technology, applied in the direction of frequency measurement devices, frequency-to-pulse sequence conversion, etc., can solve problems such as incapable of quasi-real-time measurement, and achieve the effect of improving measurement accuracy and resolution, and quasi-real-time measurement
Inactive Publication Date: 2012-06-13
JIANGSU LVYANG ELECTRONICS INSTR GROUP
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Problems solved by technology
With the wide application of modulation signals and the increase of modulation frequency, the measurement accuracy requirements are getting higher and higher, but the existing technology cannot fully realize quasi-real-time measurement during the measurement period, and currently, there is no technology that can effectively High resolution for frequency and time measurements
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Embodiment 1
[0020] Such as Figure 1-3 As shown, the circuit for realizing high-resolution frequency and time measurement includes a time and frequency measurement logic circuit and a high-resolution digital time base circuit. The time and frequency measurement logic circuit is mainly composed of a high-speed gate switch, a non-interval counter, and a digital internal The high-speed gating switch and the non-interval counter can directly realize the gating, counting and error detection of the input signal through programming; the high-resolution digital time base circuit is mainly composed of a time interleaver, and the time interleaver is used The time interval between the gate after the measurement and the signal under test are synchronized to the first counting clock pulse thereafter; the time interpolator includes the time discriminator and the ΔT time interpolator; the time discriminator is used to identify the synchronization gate edge to the following The time difference ΔT between ...
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The invention discloses a circuit capable of realizing high resolution for measuring frequency and time. The circuit comprises a time and frequency measurement logic circuit and a high-resolution digital time-base circuit; a high-speed gating switch and an interval-free counter are programmed to directly carry out gating, counting and error detection on input signals; the high-resolution digital time-base circuit is mainly composed of a time interpolator; the time interpolator is used for measuring a time interval between a gate which is synchronized with a detected signal and a first counting clock pulse; the time interpolator comprises a time discriminator and a delta T time interpolator; the time discriminator is used for identifying a time difference delta T between a synchronized gate edge and a 100-MHz clock pulse; and the delta T time interpolator is used for improving the resolution of the delta T measurement. According to the invention, a gray code counter is established by using a large-scale high-speed FPGA (Field Programmable Gata Array) to realize the interval-free measurement; by utilizing a digital interpolation technology, the measurement precision and the resolution are improved, so that the near real-time measurement can be realized and the measurement resolution of the frequency can reach to 1*10 to the tenth power.
Description
Technical field [0001] The invention relates to a circuit for realizing high-resolution measurement of frequency and time, and belongs to the technical field of realizing high-resolution. Background technique [0002] In manufacturing or repairing an electronic device, the time period or frequency of various electronic components is adjusted. For example, when manufacturing a computer, it may be necessary to adjust the time period of a monostable multivibrator or a voltage-controlled oscillator that is repeatedly triggered. The adjustment of such devices often requires high time accuracy. With the widespread application of modulation signals and the increase of modulation frequency, the accuracy requirements of measurement are getting higher and higher. However, the existing technology cannot fully realize quasi real-time measurement during the measurement period, and currently, there is no technology that can be effective. Achieve high resolution of frequency and time measureme...
Claims
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IPC IPC(8): G01R23/10
Inventor 印德荣吴财喜
Owner JIANGSU LVYANG ELECTRONICS INSTR GROUP