PS. Кстати, вот тут пишут, что "Although sigma-delta converter theory can be subtle and mind-bending to understand, the implementation of a first-order sigma-delta modulator is dirt simple. This works whether you're using a 1-bit DAC, a 16-bit DAC or an odd-numbered counter in a processor's PWM output circuit." =>
http://eetimes.com …eral/PrintView/4006431