Phase-frequency characteristic detector and phase-frequency characteristic detection method
A phase-frequency characteristic and detector technology, which is applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve problems such as phase detection nonlinearity, and achieve the effect of simple and convenient operation and high measurement accuracy
Active Publication Date: 2015-04-22
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0016] The ideal relationship curve between the input phase difference of AD8302 and the phase output voltage is as follows figure 1 As shown, but there is nonlinearity in the phase detection of AD8302, the actual relationship curve between the input phase difference and the phase output voltage is as follows figure 2 shown
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[0045] An embodiment of the present invention includes the following steps:
[0046] a) Two-channel phase-adjustable signal generator 1 outputs two-channel signals, one of which is a reference signal, which is directly sent to AD8302 and its peripheral circuit 3; Signal to AD8302 and its peripheral circuit 3, use the setting unit to set the frequency of the sweep signal and the reference signal through the digital control unit 7 to be equal to the frequency to be measured;
[0047] b) Calculate the corresponding phase output voltage U when the absolute value of the input signal phase difference of AD8302 and its peripheral circuit 3 is 45° and 135° 2 , U 3 , calculate U 2 , U 3 The corresponding digital quantity D when passing through the low-pass filter 4, the amplifier, and the analog-to-digital conversion circuit 6 in sequence 2 , D 3 ;
[0048] c) Use the setting unit to repeatedly adjust the phase difference between the frequency sweep signal and the reference signa...
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The invention relates to a phase-frequency characteristic detector and a phase-frequency characteristic detection method. The phase-frequency characteristic detector comprises a dual-phase adjustable signal generator and a modulation method based phase detection unit, wherein one output port of the dual-phase adjustable signal generator is connected with one input port of the modulation method based phase detection unit, and the other output port of the dual-phase adjustable signal generator is connected with another input port of the modulation method based phase detection unit through a detected network. The phase-frequency characteristic detector further comprises an analog-digital conversion circuit, wherein the analog-digital conversion circuit is connected with the phase output voltage end of the modulation method based phase detection unit, the output end of the analog-digital conversion circuit is connected with the input end of the dual-phase adjustable signal generator through a digital control unit, and the digital control unit is connected with a displaying unit and a setting unit. The phase-frequency characteristic detector provided by the invention is easy and convenient to operate, has high detection precision, can evade the area with big detection error of the modulation method based phase detection unit, can directly judge that the detected network is a lead network or lag network and can obtain the phase displacement of the detected network.
Description
technical field [0001] The invention relates to the field of frequency characteristic measurement of a network under test, in particular to a phase-frequency characteristic detector and a method for detecting the phase-frequency characteristic. Background technique [0002] In the fields of radar technology and communication technology, it is often necessary to detect the frequency characteristics of the network under test, such as measuring the frequency characteristics of filters, amplifiers, high-frequency tuners, duplexers and antennas. [0003] Frequency characteristics include amplitude-frequency characteristics and phase-frequency characteristics. At present, most of the foreign frequency characteristic testers or frequency sweeper products on the market are concentrated in the radio frequency and microwave frequency bands with high technical content and high profit margins. There are few medium and low frequency products, and most of them are expensive. The price of...
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IPC IPC(8): G01R25/00
Inventor 唐立军彭艳云郑隆浩张春熹贺慧勇
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY