The Hardware Design And Realization Of The Arbitrary Waveform Signal Generator Based On FPGA

Arbitrary waveform generator is universal testing instrument widely used in modern electronic measuring, this paper uses direct digital frequency synthesis(DDS) technology, modular arbitrary waveform generator can output a conventional output waveform also has a user-defined waveform and High-resolution, low phase noise, frequency switching speed, phase-continuous and so on. Arbitrary Waveform Signal Generator hardware design mainly consists of two parts: an initial part of the number used to generate a digital waveform and processing the analog portion of the original waveform.This paper relies on actual projects to the NI PXIe-1075 chassis and PXIe-8135 real-time controller for the PC, based on the Xilinx Virtex-5 XC5VLX110 T FPGA and MAXIM company MAX5888 A DAC completed the arbitrary waveform generator board design, Hardware board design work includes interface circuits, digital processing module, signal conditioning modules of three parts. The main work of this thesis is as follows:1.Analyse the current situation of arbitrary waveform signal generator, a method is proposed to achieve PXIe interface communication by using FPGA and DDS structure,and determine the "FPGA + DAC + signal conditioning part of the" hardware design overall program.2.According to the hardware overall scheme proposed instrumentation miniaturization design, starting from the functional integration and around the FPGA to complete the module functional design and mechanical standards meet PXIe3 U board.3.Analyse the system metrics, complete device selection and the specific functional circuit design, a design ideas is proposed differential device to build the entire signal chain, demonstrates the differential signal carries the information of the DC biasing scheme.4.Complete the sine, triangle, square, ramp, and other conventional signals and AM, FM, FSK, PSK based on controllable magnitude and frequency sine wave modulation.5.For indicators 10-50 mV small signal waveform quality and improve of the signal noise of the entire board to do a special treatment. Including small signal branch of special design, signal path impedance simulation, signal integrity presimulation, power integrity simulation.6.Complete the arbitrary waveform signal generator hardware testing and prototype debugging, including building a test environment, the hardware module testing, upper and lower machine Joint commissioning, verified the reasonable of the design.Test results show that this thesis designed single-slot 3U PXIe dual-channel arbitrary waveform generator sampling rate of 200 MSPS, 16-bit vertical resolution, memory depth 1Mb, the maximum of sine wave output frequency 40 MHz, The whole board noise control is within 2mV, and the power consumption is within 15 W. the amplitude range 10mVpp~10Vpp, amplitude resolution 10 mV, 10 MHz frequency resolution; sinusoidal maximum output frequency 40 MHz, triangle, square wave and oblique wave the highest output frequency 5MHz. The output of FM, PSK, FSK, SWEEP, AM waveform amplitude, phase, frequency can be adjusted. The results show that this thesis waveform generator, basically reached the indicator.The waveform index meet the design requirements.