System frequency response test using continuous sweep frequencies
A technology of chirp frequency and system under test, applied in the field of accurate analysis, can solve problems such as poor resolution, and achieve the effect of improving resolution
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[0018] FIG. 1 illustrates a conventional single tone test system 100 . The sine wave generator 101 is coupled to the input of a system under test 102, which may be, for example, a filter. A digitizer 103 acquires and digitizes the output of the system under test 102 and then transmits it to a fast Fourier transform (FFT) circuit 104 which computes the discrete Fourier transform (DFT) of the acquired output signal. In system 100, digitizer 103 acquires once for each frequency from sine wave generator 101, and FFT circuit 104 generates a DFT data point for each acquired signal. Of all the FFT data, only one DFT data point is required, which is not a time efficient use. Testing narrowband filters, such as bandpass or bandstop filters, using system 100 may be difficult due to the practical trade-off of long test times and low data points. The more data points required to measure the response of a narrowband filter, the longer the measurement time. In addition, it is difficult f...
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