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Zero-Order Hold - Implement zero-order hold of one sample period

Library

Discrete

Description

The Zero-Order Hold block samples and holds the input for the sample period you specify. The block accepts one input and generates one output. Each signal can be scalar or vector. If the input is a vector, the block holds all elements of the vector for the same sample period.

You specify the time between samples with the Sample time parameter. A setting of -1 means the block inherits the Sample time.

Tip   Do not use the Zero-Order Hold block to create a fast-to-slow transition between blocks operating at different sample rates. Instead, use the Rate Transition block.

Data Type Support

The Zero-Order Hold block accepts real or complex signals of any data type supported by Simulink software, including fixed-point and enumerated data types.

For a discussion on the data types supported by Simulink software, see Data Types Supported by Simulink in the Simulink documentation.

Parameters and Dialog Box

Sample time (-1 for inherited)

Specify the time interval between samples. To inherit the sample time, set this parameter to -1. See How to Specify the Sample Time in the online documentation for more information.

Bus Support

The Zero-Order Hold block is a bus-capable block. The input can be a virtual or nonvirtual bus signal. No block-specific restrictions exist. All signals in a nonvirtual bus input to a Zero-Order Hold block must have the same sample time, even if the elements of the associated bus object specify inherited sample times. You can use a Rate Transition block to change the sample time of an individual signal, or of all signals in a bus. See Using Composite Signals and Bus-Capable Blocks in the Simulink User's Guide for more information.

Characteristics

Bus-capable	Yes
Direct Feedthrough	Yes
Sample Time	Specified in the Sample time parameter
Scalar Expansion	No
Dimensionalized	Yes
Zero Crossing	No

XY Graph

Zero-Pole

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