Open Switch Holds Value - Electronic Circuits V: Front-End Conditioning and Gain Contracts Step by Step

Once the sample switch opens, the held value is the model output. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

The open switch isolates the held node

The input has moved to 1 volt, but the held output remains 4 volts.

V_{\text{out}} = V_{\text{held}} = 4\ \text{V}

No decay curve is claimed here

The exact model says hold equals 4 volts. Leakage and acquisition time are deferred.

\text{hold state: } V_{\text{out}} = 4\ \text{V}