Not creating an accurate low voltage using PWM

Trying to create controllable low voltages – μVs – using a microcontroller is tricky. Even is only relative, rather than absolute, accuracy is requited. The issue is working near oV – frequently even proper single-rail DACs get very soft near 0V, or have large dc offsets. In a moment of inspiration, I though I had ...

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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/creating-accurate-low-voltage-using-pwm-2017-10/