
Digital storage oscilloscopes
...................... -_.; .......... ; ......................... ~;-_--_--_-_-;_-; .... -.
memory could be reset shortly before the next sample is due to be
taken and the process started all over again. Such open loop
memories were used in some cheaper types of early analog
sampling oscilloscopes.
The advantage of introducing a feedback loop is two fold. First,
the feedback can be used to hold the voltage of the capacitor at
the output of the sampling gate at the level of the sample just
taken, and then if the signal, when the next sample is taken,
happens ...