Sampling is a technique to capture a dynamic signal on the FLY. For example a variable frequency similar to voice signal can neither be reproduced nor it's amplitude be constant. Every time a voice command is issued it will be different. Therefore to capture such a signal, sampling technique is used. The fineness depends on how many times such a signal is captured and stored in a second. This is typically called as sampling rate. It is also necessary to HOLD the sampled signal to initiate a conversion process. When sampling and HOLD operations are performed together, there exists a finite phase difference and Lag due to the HOLD capacitor. As a result of this the result may be somewhat different than the actual signal itself. However the held signal will be nearly equal to the original signal, not the same signal. Hence study of SAMPLE and HOLD signal block in a larger circuit becomes necessary. The SAMPLE and HOLD circuit trainer helps in understanding the rudiments of teaching SAMPLE and HOLD method by experimentation. This trainer requires an additional Lab power supply of 12V @ 500mA, a signal source similar to function generator and a pulse generator, a DMM. |
