Device and synchronization method for synchronous output between multichannel DDSs
An output device, multi-channel technology, applied in the microwave field to avoid changes
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[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0014] figure 2 It is a schematic block diagram of the realization circuit of the present invention. FPGA sends out I / O_UPDATE signal and controls one DDS to generate linear frequency modulation signal. The signal output by DDS is sent to FPGA after sampling by coupling network and A / D. FPGA uses digital deskewing method to detect and store The time difference between the DDS signal and the DDS signal is controlled separately to open and detect each DDS separately. By selecting the channel with the largest time difference among all DDS channels as the reference channel, the time difference is the standard channel time difference, and the time difference of each channel is subtracted from the standard channel time difference. It is the synchronous output time difference between channels. FPGA calculates the delay amount according to the synchronous out...
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