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
ParameterTypical rangeNotes & selection driver
BandwidthDC to 100 MHz
Hold Step< 1 mV
Droop Rate< 0.1 mV/µs
Power Supply±15 V
Acquisition Time10 ns to 100 µs
Input Voltage Range±10 V

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 9001, IEC 60747, JEDEC JESD22

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/Digital Converter

Electronic device that converts continuous analog signals into discrete digital values for processing by digital systems.

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Analog-to-Digital Converter (ADC)

An electronic component that converts continuous analog signals into discrete digital values.

View Product Details

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

Typical Suppliers & Equivalents

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.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Sample-and-Hold Circuit

Manufacturer profiles associated with Sample-and-Hold Circuit.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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