Track-and-hold-sample-and-hold

  
Channel 1 is wired as a voltage follower and is turned on during the track/sample time. Ifthe product of R x Cis sufficiently short compared to the period of maximum output frequency, or sample time; Cwill charge to the output level.
Track-and-hold-sample-and-hold - schematic

Channel2 is an integrator with zero input signal. When channel2 is then turned on, the output will remain at the voltage across C.




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