Posted on Oct 22, 2012 9127
This circuit reconstructs and separates analog signals which have been time-division multiplexed. The conventional method, shown on the left, has several restrictions, particularly when a short dwell time and a long, accurate hold time is required. The capacitors must charge from a low-impedance source through the resistance and current-limiting characteristics of the multiplexer. When holding, the high-impedance lines are relatively long and subject to noise pickup and leakage.
When FET input buffer amplifiers are used for low leakage applications, severe temperature offset errors are often introduced.