Digital precision phase-shift method and phase shifter
A phase-shifting and precise technology, applied in the field of phase shifters, can solve the problems of phase-shifting phase value fluctuations, difficult discrete circuit implementation, high phase-shifting precision, etc., and achieve the effect of stable phase shift, low cost and stable phase
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[0029] 1. Part selection
[0030] A. CPLD4 uses EPM1270T144C5 from ALTERA company;
[0031] B, 24-bit counter module 1 is realized in CPLD 4 with Verilog HDL language;
[0032] C. The 23-bit preset counter module 2 is implemented in CPLD 4 with Verilog HDL language;
[0033] D, D flip-flop module 3 is implemented in CPLD 4 with Verilog HDL language.
[0034] 2. Specific implementation methods
[0035] Depend on figure 1 As shown, the implementation steps of a phase shifting method are as follows:
[0036] ①Input signal F IN Connect to the clock input terminal of the n-bit counter M1, and the output of the counter M1 is the same
[0037] Step square wave signal, one of which is F IN×1 / N , the other signal is F IN×2 / N , F IN×1 / N The frequency is F IN one-nth of N, and F IN×2 / N The frequency is F IN×1 / N Twice of , where N≤2n and the value of N is determined by the control parameters of the counter M1, F IN×1 / N That is, the square wave signal to be phase-shifted;
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