Hi Steve,
You still haven't quantified the desired performance anywhere here have you ?
Or have I missed it ?

I am using PCF8591 8bit i2c ADC for digitizing the output from precision rectifier. Thus I want an accuracy over atleast 7bits and I expect the precision rectifier to help me achieve 7 bit accuracy the rectifier should give output atleast accurate to 7bit resolution. I mean the distortions of original waveform after rectification shouldn't detoriate the 7 bit precision.

Regards,
Prahlad Purohit