# Regular Meeting (2021.12.27)

* About PMW-Circuit
* Progress of xvz-zybo:
* can't mount rootfs -> lost [*init script*](https://www.twblogs.net/a/5c4b4ed2bd9eee6e7e06d336)

## About PMW-Circuit

* ~~Maybe try this [IC](https://www.onsemi.com/pdf/datasheet/sg3525a-d.pdf) as you mentioned~~ -> only ~400kHz
* Peripheral circuit is complex
* Not good for the small size
* Ti-Forum: pending (Xmas)
* My thought:
* Implement PWM circuit with (High-speed)OPAs and compartor
* https://electronics.stackexchange.com/questions/433862/how-to-produce-sawtooth-waveform-from-square-waveform
* https://training.ti.com/sites/default/files/docs/pwm_generator_circuit.pdf
* Size issue
* Layout issue
* [OPA](https://www.ti.com/lit/ds/symlink/lmh6624.pdf?HQS=dis-mous-null-mousermode-dsf-pf-null-wwe&ts=1640569422339&ref_url=https%253A%252F%252Fwww.mouser.tw%252F)
* [High-speed comparator](https://www.ti.com/product/TLV9022-Q1)

###### tags: `Regular Meeting` `DeWei`