ABSTRACT
This paper revolves around an ultra-wideband frequency measurement circuit design. We proposed a low-cost ultra-wideband frequency measurement circuit design method. The design uses a FPGA and an analog circuit framework; analog input channels set 10 MHz as the demarcation point and design different analog signal processing circuits. The low-frequency signal is completed by using a multi-stage amplifier and then is completed by ECL level conversion; the high frequency signal is completed by using a special high-frequency amplifier circuit and the frequency dividing circuit; the FPGA realizes signal pre-measurement, automatic switching, and a high-precision frequency measurement algorithm. Experiments show that in the signal ranges from 10 Hz to 3G and 50 mV to 200 V, the design method realizes fine frequency measurement results, high precision (relative error is less), low cost, and has broad application prospects.
