Editorial Technical Reference

Sample-and-Hold Circuit

This page explains how Sample-and-Hold Circuit is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

An electronic circuit that captures and holds an analog voltage signal at a specific instant in time for subsequent processing.

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Product Specifications

Technical details and manufacturing context for Sample-and-Hold Circuit

Definition
A critical component within an Analog-to-Digital Converter (ADC) chip that temporarily stores the instantaneous value of a continuously varying analog input signal. This 'frozen' voltage level is then presented to the ADC's quantizer for conversion into a stable digital value, ensuring accuracy during the conversion process by preventing signal changes from corrupting the measurement.
Working Principle
The circuit operates in two phases controlled by a clock signal. In the 'sample' phase, a switch (typically a MOSFET) closes, connecting the input to a storage capacitor, which charges to the instantaneous input voltage. In the 'hold' phase, the switch opens, isolating the capacitor. An operational amplifier in a voltage-follower configuration then reads and outputs the held voltage from the capacitor with high input impedance, maintaining the stored level for the ADC's conversion cycle.
Common Materials
Silicon (Semiconductor substrate), Metal (Interconnects), Silicon Dioxide (Insulator), Polymer (Passivation)
Technical Parameters
ParameterNotes & selection driver
Spec(V) Input voltage range the circuit can accurately sample and hold.
Components / BOM
  • Sampling Switch Part
    A fast electronic switch (e.g., MOSFET) that connects the input signal to the hold capacitor during the sample phase and disconnects it during the hold phase.
    Material: Silicon (MOSFET)
  • Hold Capacitor Part
    A high-quality capacitor that stores the sampled analog voltage charge when the switch is open, maintaining the voltage level for the ADC.
    Material: Silicon (MOS capacitor) or Metal-Insulator-Metal (MIM)
  • Buffer Amplifier
    An operational amplifier configured as a voltage follower (unity gain). It presents a high impedance to the hold capacitor to minimize loading and droop, and provides a low-impedance output of the held voltage to the ADC.
    Material: Silicon (Bipolar or CMOS transistors)

Industry Taxonomies & Aliases

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

high-speed sample-and-hold circuit analog signal sampling electronics hold capacitor circuit design precision voltage sampling module electronic signal acquisition circuit

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Analog-to-Digital Converter (ADC) Chip
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Peripheral Interfaces (ADC/DAC)
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ADC Core
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A/D Converter (if needed)
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (electronic circuit, not fluidic)
other spec: Hold time: 1ms to 10s (typical), Acquisition time: 10ns to 100μs, Droop rate: <1mV/ms
temperature: -40°C to +125°C (operational range for typical ICs)
Media Compatibility
✓ Analog voltage signals (0-10V range) ✓ Low-impedance sensor outputs ✓ Audio frequency signals (DC-20kHz)
Unsuitable: High-frequency RF signals (>100MHz) or environments with strong electromagnetic interference
Sizing Data Required
  • Signal bandwidth/frequency (Hz)
  • Required acquisition time (seconds)
  • Hold time duration (seconds)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Hold capacitor leakage or degradation
Cause: Electrolytic capacitor aging, dielectric breakdown, or contamination leading to charge loss and inaccurate voltage retention
Switch transistor failure or signal distortion
Cause: MOSFET/BJT degradation from overvoltage, thermal stress, or switching frequency exceeding specifications causing poor sampling accuracy
Maintenance Indicators
  • Audible high-frequency oscillation or buzzing from the circuit indicating unstable switching or feedback issues
  • Visual output drift or inconsistent readings on monitoring equipment showing poor hold accuracy or sampling errors
Engineering Tips
  • Use high-quality, low-leakage capacitors with appropriate voltage ratings and implement periodic calibration to compensate for component aging
  • Ensure proper heat sinking for switching components, maintain clean power supply filtering, and adhere to specified maximum sampling rates to prevent transistor stress

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 Quality Management Systems IEC 61000-4-4 Electromagnetic Compatibility (EMC) CE Marking (EU Directive 2014/35/EU Low Voltage Directive)
Manufacturing Precision
  • Hold Step Settling Time: +/- 0.5% of specified value
  • Aperture Jitter: +/- 1 ps RMS
Quality Inspection
  • Dynamic Performance Test (SINAD/THD analysis)
  • Leakage Current Measurement (hold capacitor discharge rate)

Published Manufacturer Relationships

Source-reviewed profile relationships currently associated with Sample-and-Hold Circuit

No source-reviewed manufacturer relationship is currently published for this product.

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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.

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Frequently Asked Questions

What is the primary function of a sample-and-hold circuit?

A sample-and-hold circuit captures an analog voltage signal at a specific instant and maintains that voltage level for subsequent processing, enabling accurate analog-to-digital conversion and signal analysis.

What are the key components in a sample-and-hold circuit?

The essential components include a sampling switch to capture the signal, a hold capacitor to store the voltage, and a buffer amplifier to prevent loading and maintain signal integrity during the hold phase.

What industries commonly use sample-and-hold circuits?

These circuits are critical in computer manufacturing, telecommunications, medical instrumentation, test and measurement equipment, and optical product manufacturing where precise analog signal processing is required.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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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