> Are you saying you have such circuit? > And how much the 'allmost' word describes it? > Is it 90 deg +/- 0.1 deg? > and in what frequency range? > I don't have it at the moment, but thoery is from Weaver a lot of years ago. I've simulated a passive network and an active network so far. Problem: low tolerance caps are required, of all sizes. m.c.