1 Objective
To design a Direct Digital Synthesizer (DDS) based Function Generator which can generate sine waves of frequencies up to 1GHz using a micro-controller based interface to the DDS Chip AD9953 along with two frequency multipliers for generation of user desired frequencies up to 1GHz.
2 Goals Accomplished
• A DDS based signal generator with an LCD Keypad interface using AT89C51 has been designed.
• Frequency Multipliers have been designed to take the output of the DDS as input and give a sine wave of three times the frequency of the input wave as output. Two such multipliers have been cascaded to obtain frequencies that are nine times the input frequency.
• A Variable Gain Amplifier has been designed to vary the power output as per user requirements.
• A power supply has been designed for the whole system to work off a single 230V AC supply.
