02-01-2013, 10:33 PM
Waveform generator is an indispensable tool for all kinds of test and experiment and it is also have very extensive application for communication, measuring, radar, control and teaching field. Both in production, scientific research or in the teaching, waveform generator are the best tools for electronic engineers to do the simulation experiment of signal. In recent years, the FPGA technology obtained a rapid development and extensive application of greatly increase of its resource capacity, working frequency and integration and the use of FPGA got attention in realizing some special digital integrated circuit and direct digital frequency synthesizer based on FPGA has the more advantages .The advantages are that it has a flexible interface and the control mode, a relatively short period of time, a wide conversion bandwidth and phase change and continuous frequency resolution is higher. Using FPGA as signal generator, frequency or amplitude value is input from the keyboard and it will be displayed in the LCD1602. Frequency or amplitude value is converted to frequency or amplitude control word sent to the DDS through the micro controller. Moreover, the direct numerical frequency synthesizer based on FPGA has a lot of benefits, such as flexible joggle and way to control, relatively short transmuting time, relatively broad belt, the succession of change of phase position and high screen resolution, etc.