Design of amplitude adjustable signal generator based on FPGA
Kun Zhang · Electronic Design Engineering · 2011
For the requirements of high frequency accuracy and amplitude adjustability of a signal generator,the direct digital synthesis(DDS) technology is applied in the design of the FPGA-based signal generator.The amplitude and frequency of the output of the signal generator are adjustable,and high resolution and high stability are obtained.MCU AT89S52 is used to control the whole system,and the signal generated by FPGA is output through a double-DAC and a low-pass filter.The amplitude range is 0~5 V with the resolution of 10-bit,the frequency range is 1 Hz~10 MHz with the minimum resolution of 1 Hz,and the frequency stability is better than 10-4.The parameters of amplitude and frequency can be entered through keyboard and displayed on LCD.Due to the programmability of FPGA,the system is easy to upgrade and optimize.full adder function can be well implemented by using simulation design of Multisim software.