Hi Balaji,
1. Please see the attached excerpt of the code I'm using.
2. The approx Zmin value I've used for calculation is 20 ohm, RCAL= 1kohm, RTIA= 148ohm, CTIA=10nF and DAC Output = 600mV.
3. The frequency of measurement is 80Hz to 79KHz.
4. The Phase offset appeared to be a linear function of the frequency.. approximately +-15-20 degrees.
Best regards,
Shehzad