I'm projecting 0-10V regulated voltage source. Diagram below shows general idea:
Basically i generate a 0-5V PWM with regulated duty cycle. PWM signal drives a key that switches between 0 and 10V to create another square wave. Low Pass Filter creates DC signal from 0-10V square wave. At the end there is an op-amp for separation.
I want to use 16bit pwm - mode 14 on ATmega8 if i remember right.
So I should have a square wave at around 120Hz.
As my switch I wanted to use MOSFET N + bipolar totem-pole drive circuit, something like shown below:
The problem is that when I was designing that switch I didn't know exactly what resolution (frequency) PWM I would use. So know I'm not sure if it's a good solution given the condition mentioned above.
As my LPF I'll have to use higher order active filter because as it turned out I need my output DC voltage to be as stable as possible so I can't use simple RC network because it gives too much riple to the DC voltage.
Basically that's my idea. The circuit has to provide high stability and precise regulation of output DC voltage, it doesn't have to respond fast though.
So that is my idea, I would like to hear some constructive criticism :) especially regarding that switch "subcircuit".