Sample and Hold

Sample first input and hold its value based on value of second input


Control and Measurements/Additional Components


The Sample and Hold block outputs the In input signal as long as S input signal is true. The block holds the output when the S input signal becomes false.

Dialog Box and Parameters

Initial condition

Specify the initial value of the output.

Sample time

Specify the sample time of the block, in seconds. Set to 0 to implement a continuous block.

Inputs and Outputs


The signal.


The control signal, which must be a Boolean.


The sampled signal.


Direct FeedthroughYes
Sample TimeSpecified in the Sample Time parameter
Scalar ExpansionYes
Zero-Crossing DetectionNo


The power_SampleAndHoldpower_SampleAndHold example shows the operation of the Sample and Hold block.

The model sample time is parameterized with the variable Ts (default value Ts = 50e-6). To simulate a continuous Bistable block, specify Ts = 0 in the MATLAB® Command Window.

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