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FPGA Based High Frequency PWM Waveform Generator ...
https://www.ijntr.org/download_data/IJNTR02040042.pdf
into SPARTAN 3 FPGA. Pulse-Width modulation is commonly used in industrial applications for electrical motor control but is also used in audio applications, such as compact class-D power amplifiers, and drivers for light source based on light emitting diodes our main focus in this project is to control speed of DC motor at high frequency.
fpga4fun.com - PWM DAC 3 - One-bit DAC
https://www.fpga4fun.com/PWM_DAC_3.html
Since the frequency at which FPGAs run is so fast compared to the frequencies required in the audio domain (MHZ's compared to KHz's), a one-bit DAC is a better choice. Basically, to create the analog output, we smooth out the PWM or sigma-delta modulator output pulses using a …
Tutorial for PWM with FPGA (Zybo) and Vivado (VHDL) - …
https://miscircuitos.com/pwm-with-zybo-in-vhdl/
Overview :: PWM Audio Controller :: OpenCores
https://opencores.org/projects/wbpwmaudio
A PWM Module - Programming FPGAs Getting Started …
https://www.fpgakey.com/tutorial/section557
Playing audio with an FPGA - Hackster.io
https://www.hackster.io/Kampino/playing-audio-with-an-fpga-d2bc85
Beginner simple audio implementation on FPGA : FPGA
https://www.reddit.com/r/FPGA/comments/8czztn/beginner_simple_audio_implementation_on_fpga/
An issue is that most tutorials I have found are based on an fpga board with an audio codec, which the Nexys4 does not have. To my understanding the implementation in the tutorial I linked is simply using the most significant bit in a 16 bit binary counter to create a square signal to feed into the speaker output.
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