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

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Roy Francis
Roy Francis 2013-3-23
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,

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Tim McBrayer
Tim McBrayer 2013-3-25
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.
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Roy Francis
Roy Francis 2013-5-30
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,

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