Burst signal generator with automatic initial phase calibration function
A technology of signal generator and initial phase, applied in instruments, parts of electrical measuring instruments, measuring devices, etc., can solve the problems of cumbersome and time-consuming operation
Inactive Publication Date: 2012-06-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
In order to calibrate the initial phase of the burst signal, the traditional method often uses special equipment to measure and perform software fitting, but this method is cumbersome and time-consuming
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[0058] Since the present invention has high requirements on voltage measurement accuracy, a high-precision voltage measurement device is used in the signal measurement unit during the specific implementation process. In this example the measurement accuracy of the signal measurement unit is 6½ digits. Simultaneously, since the present invention is an automatic measuring device, all measuring processes are automatically completed during the actual implementation. Taking the sinusoidal carrier burst signal as an example, the working process is introduced as follows:
[0059] 1. After the setting is completed, the signal generation unit generates a continuous sine wave signal with a frequency of 100kHz and an amplitude of 1V, and connects the average value measuring device and the peak-peak value measuring device in turn, and records the measurement results U CPP and Δ u DC , and fill in the measurement results in Table 1.
[0060] 2. The burst signal generator generates a bu...
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The invention discloses a burst signal generator with an automatic initial phase calibration function. A signal measurement unit, which is composed of an average value measurement device and a peak-to-peak value measurement device, is additionally arranged on the base of the traditional burst signal generator. The signal measurement unit is used for firstly measuring a peak-to-peak value voltage UCPP and a direct-current bias voltage deltaUDC of a continuous carrier signal, and an average value UAVE of measured burst signals, and then calculating an initial phase theta2 of an output burst signal and setting a phase difference deltatheta between an initial phase theta1 and the initial phase theta2, and increasing and decreasing a phase control word according to the phase difference deltatheta. According to the invention, the signal measurement unit is placed in the burst signal generator and a measured result is fed back to a control unit to increase and decrease the phase control word and carry out corresponding calibration on the initial phase. The calibration process does not need manual intervention and has the advantage of rapid and accurate calibration compared with the traditional method.
Description
technical field [0001] The invention belongs to the technical field of waveform generation and measurement, and more specifically relates to a burst signal generator with the function of initial phase automatic calibration. Background technique [0002] In the technical field of electronic test instruments, burst signals are more and more widely used. For a signal source with a burst function, how to ensure the high precision of the burst initial phase has become an important issue in the field of burst signal generation and measurement. [0003] Such as figure 1 As shown, the burst signal is actually a modulation signal, which is defined as outputting one or several carrier waveforms with specific frequency and phase after the trigger pulse signal arrives, and outputting a constant DC signal before the next trigger pulse signal arrives . The carrier wave can be various common continuous waveforms such as sine wave, triangle wave, and sawtooth wave. figure 1 It is a burs...
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IPC IPC(8): G01R1/28
Inventor 郭广坤刘科田书林黄建国肖寅东
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA