At what values of Ci and Rd can precision clamping be obtained in peak clamper when the time period of the input waveform is 0.4s?

In a peak clamper circuit, precision clamping can be obtained when the product of the resistance (Rd) and capacitance (Ci) is much greater than the time period of the input waveform. This is represented by the inequality Rd*Ci >> T, where T is the time period.

Given that the time period T is 0.4s, we need Rd*Ci to be much greater than 0.4s.

However, without specific values for either Rd or Ci, we cannot determine the exact values at which precision clamping can be obtained. The values of Rd and Ci are dependent on each other - if Rd is increased, Ci can be decreased and vice versa, as long as their product remains much greater than 0.4s.

In practice, the choice of Rd and Ci values would also depend on the specific requirements of the circuit, such as the desired speed of response and the allowable ripple voltage.