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You could use the micro to control a D/A converter or digital pot to get, say, an output of 0-5V; then use a voltage divider to reduce that to the mV range you need. A buffer amplifier might be needed to apply the test voltage to the diode.How I could to programme the incremental voltage
When you RC filter the pwm, you get a stable voltage proportional to pulse width.wkrug, thank you for your suggest.
PWM controls the voltage impulse width, but not the amplitude (as I understand).
Yes, that was the Idea behind this.When you RC filter the pwm, you get a stable voltage proportional to pulse width.