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Instead using Cordic generate sin wave with DDS. Then during input signal change change the phase of the sine wave by reading from different location. This works. I've done this. vhdl4u gmail com
Basically you neead to generate a counter where it count 0, 1 and 2. So, your 2-bit counter output is /3. Now, pl. note that that output will not have 50% duty cycle. If you need 50% duty cycle then you need more circuit.
Re: final year project
For that you can do FPGA based modulation scheme where input data is given to your system and output is either AM, FM or PM based on modulation selected.
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