Erez,

  Could you provide any information about the target droop
and other parameters, e.g., target process, etc.? A quick calculation
shows that 1pA of leakage and 1pF hold capacitor give a slew
rate of 1V/s. Seems like the target is difficult to achieve but not
impossible.

                                                                   Best Regards,

                                                                       Sheldon