However, extending the upper frequency of such function signal generator is limited by the read-out time of the memory and the conversion rate of the digital-to-analogconverter.
The conversion speeds and results of ADC0809 analog-to-digital converter are accurate tested and analyzed by using multi-master clock pulse with different frequency and pulse width.
After the sequence passes through digital-to-analogconverter and low pass filter, the desired frequency sweep signal is synthesized by the method of direct digital synthesis.