On 6/29/2010 11:10 AM, Attila Kinali wrote:
Yes, 16bit D/A seems to be the maximum that is currently available. It crossed my mind to build a 24bit R-2R D/A using discrete components, but this might have actually a worse performance than a off the shelf 16bit D/A. (temperature drifft, resistor values missmatch, EMI, etc)
A few years ago (circa 2004) I built a GPSDO that used the PWM feature of an Atmel uC to generate the EFC. The PWM in that uC has only 10 bits of granularity, but then I applied another 10 bits of dithering to the two register values that defined the limits of the PWM. Of course, I had to low pass the generated signal with a filter with almost 120 dB of rejection at 3.9 Hz, but this contraption worked, and was really inexpensive, costing only a few lines of code. Alberto I2PHD _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
