INDUSTRY COMPONENT

Sample-and-Hold Circuit

A Sample-and-Hold Circuit captures and maintains an analog voltage for accurate analog-to-digital conversion in industrial systems.

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Component Specifications

Definition
A Sample-and-Hold Circuit (S/H) is an electronic component that samples an analog input signal at a specific instant and holds the sampled value constant for a defined period. It is critical in Analog-to-Digital Converters (ADCs) to prevent signal distortion during conversion, ensuring the ADC processes a stable voltage. The circuit typically consists of a switch, a capacitor, and buffer amplifiers, operating under precise timing control to capture transient or varying signals accurately.
Working Principle
The circuit operates by closing a switch (sampling phase) to connect an input signal to a storage capacitor, charging it to the input voltage. The switch then opens (hold phase), isolating the capacitor to maintain the voltage. Buffer amplifiers provide high input impedance during sampling and low output impedance during holding, minimizing loading effects and preserving the signal integrity for the ADC.
Materials
Semiconductor materials (e.g., silicon for MOSFET switches), dielectric materials for capacitors (e.g., ceramic or polypropylene), copper for interconnects, and insulating substrates (e.g., FR4 for PCBs).
Technical Parameters
  • Bandwidth DC to 100 MHz
  • Hold Step < 1 mV
  • Droop Rate < 0.1 mV/µs
  • Power Supply ±15 V
  • Acquisition Time 10 ns to 100 µs
  • Input Voltage Range ±10 V
Standards
ISO 9001, IEC 60747, JEDEC JESD22

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sample-and-Hold Circuit.

sample-and-hold circuit S/H circuit analog-to-digital converter ADC component signal sampling hold capacitor industrial electronics Sample-and-Hold Circuit in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Analog-to-Digital Converter

Electronic circuit that converts continuous analog audio signals into discrete digital values for processing.

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Analog-to-Digital Converter (ADC) Chip

Integrated circuit that converts continuous analog signals into discrete digital values for processing by digital systems.

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Peripheral Interfaces (ADC/DAC)

Analog-to-digital and digital-to-analog conversion interfaces that enable microcontrollers/processors to interact with analog signals from sensors and control analog actuators.

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Engineering Analysis

Risks & Mitigation
  • Signal distortion due to capacitor leakage
  • Timing jitter in sampling switch
  • Temperature sensitivity affecting accuracy
  • Electromagnetic interference (EMI) from high-frequency operation
FMEA Triads
Trigger: Capacitor dielectric absorption or leakage
Failure: Voltage droop during hold phase, leading to ADC conversion errors
Mitigation: Use low-leakage capacitors (e.g., polypropylene), implement periodic calibration, and design with guard rings to minimize leakage paths.
Trigger: Switch timing inaccuracies or jitter
Failure: Inconsistent sampling instants, causing signal aliasing or distortion
Mitigation: Employ precision clock sources, use low-jitter switches (e.g., MOSFET-based), and incorporate feedback control for timing alignment.
Trigger: Temperature variations affecting component parameters
Failure: Drift in hold voltage or acquisition time, reducing system accuracy
Mitigation: Select temperature-stable materials, implement thermal compensation circuits, and operate within specified temperature ranges.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Voltage accuracy within ±0.1% of full scale, timing tolerance < 1% of sampling period
Test Method
Testing per IEC 60747 standards using precision voltage sources, oscilloscopes for timing analysis, and environmental chambers for temperature validation.

Buyer Feedback

★★★★☆ 4.8 / 5.0 (9 reviews)

"The technical documentation for this Sample-and-Hold Circuit is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Sample-and-Hold Circuit so far."

"Testing the Sample-and-Hold Circuit now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the primary function of a Sample-and-Hold Circuit?

To capture an analog voltage at a specific time and maintain it stable for accurate conversion by an Analog-to-Digital Converter (ADC), preventing errors from signal variations during the conversion process.

How does a Sample-and-Hold Circuit improve ADC performance?

By holding the input signal constant during the ADC's conversion cycle, it eliminates aperture error and reduces noise, ensuring higher resolution and accuracy in digital output.

What are common applications of Sample-and-Hold Circuits?

Used in data acquisition systems, digital oscilloscopes, communication devices, and industrial control systems where precise analog signal digitization is required.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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