How to get Sawtooth waveform that can be converted to HDL code

I have tried to generate a sine pwm using sine and saw-tooth comparison method.The sine PWM block simulated perfectly in the simulink. But error message came when converted to HDL. I have used HDL workflow Adviser for the conversion from simulink to HDL. Error message is no implementation block for signal generator(sawtooth wave).

How to generate a 25KHz sawtooth waveform(-1V to +1V) that can be converted to HDL code? I would like to implement the sine pwm through FPGA board.

Any idea how it is possible? or any alternate method possible for Sine PWM generation?

Regards,

Answer 1

[Tim McBrayer]

As you have noted, the Signal Generator block is not supported by HDL Coder. I don't think that HDL Coder can directly solve your problem here. You are asking for an analog signal out of your FPGA; HDL Coder is a digital design tool. If your board has a D-A converter on it that you can drive with your FPGA, then the digital circuitry needed is basically a simple counter with the desired timing.

[Roy Francis]

I have tried with a counter free running, but the waveform generated is not a good sine pwm. Any alternate method available for the sine pwm (single phase) generation?

Regards,