Industry-Verified Manufacturing Data (2026)

Sample and Hold Circuit

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Sample and Hold Circuit used in the Computer, Electronic and Optical Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Sample and Hold Circuit is characterized by the integration of Sampling Switch and Holding Capacitor. In industrial production environments, manufacturers listed on CNFX commonly emphasize Semiconductor (Silicon) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

An electronic circuit that samples an analog signal at a specific instant and holds that value constant for subsequent processing.

Product Specifications

Technical details and manufacturing context for Sample and Hold Circuit

Definition
A critical component within Analog-to-Digital Converters (ADCs) that captures the instantaneous voltage of an analog input signal at the sampling moment and maintains this captured voltage level stable during the ADC's conversion cycle, ensuring the input signal does not change while being digitized.
Working Principle
The circuit operates in two phases: (1) Sample Phase: A switch (typically a MOSFET) closes, connecting the input signal to a holding capacitor, allowing it to charge/discharge to the input voltage. (2) Hold Phase: The switch opens, isolating the capacitor, which then maintains the sampled voltage due to its charge storage, providing a stable input for the ADC's quantizer.
Common Materials
Semiconductor (Silicon), Capacitor (e.g., Poly-Si, Metal)
Technical Parameters
  • Hold voltage accuracy and stability during conversion time (V) Customizable
Components / BOM
  • Sampling Switch
    Connects/disconnects the input signal to/from the holding capacitor based on control signal
    Material: Semiconductor (MOSFET)
  • Holding Capacitor
    Stores the sampled analog voltage charge during the hold phase
    Material: Poly-Silicon or Metal-Insulator-Metal (MIM)
  • Buffer Amplifier
    Provides high input impedance during sampling and low output impedance during holding to drive the ADC
    Material: Semiconductor (Op-amp circuit)
Engineering Reasoning
0-5 VDC input, 0-100 kHz sampling frequency, -40°C to +85°C ambient temperature
Input voltage exceeding 6.5 VDC causes op-amp saturation, sampling frequency above 120 kHz introduces aperture uncertainty >1 ns, temperature beyond -55°C or +125°C causes semiconductor junction breakdown
Design Rationale: Dielectric breakdown in hold capacitor (polypropylene film) at >50 V potential difference, charge leakage through MOSFET switch with >10 pA leakage current, thermal noise exceeding 0.5 μV RMS at >100°C
Risk Mitigation (FMEA)
Trigger Hold capacitor dielectric absorption (0.01% voltage droop per ms)
Mode: Sampled voltage decay at 0.1 mV/ms during hold phase
Strategy: Polypropylene film capacitors with <0.001% absorption coefficient, guard ring isolation reducing parasitic capacitance to <0.1 pF
Trigger MOSFET switch charge injection (2 pC per switching event)
Mode: Sample voltage offset error of ±5 mV at output
Strategy: Dummy switch compensation topology canceling 95% of injected charge, bootstrap circuit maintaining 10 V gate-source voltage constant

Industry Taxonomies & Aliases

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

Applied To / Applications

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

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
accuracy: 0.01% to 0.1% typical (depends on component tolerances)
hold time: Microseconds to seconds (depends on capacitor leakage)
temperature: -40°C to +85°C (industrial grade), -55°C to +125°C (military grade)
sampling rate: DC to 100 MHz (varies by model)
voltage range: ±5V to ±18V supply, input signal within supply rails
Media Compatibility
✓ Low-frequency sensor signals (temperature, pressure) ✓ Audio signal processing chains ✓ Analog-to-digital converter front-ends
Unsuitable: High-frequency RF signals above circuit bandwidth
Sizing Data Required
  • Maximum input signal frequency (determines required sampling rate)
  • Required hold time duration (determines capacitor size)
  • Accuracy/settling time requirements (determines component precision)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Sampling Inaccuracy
Cause: Degradation of the hold capacitor due to dielectric absorption or leakage, causing voltage droop and inaccurate signal retention.
Signal Distortion
Cause: Non-ideal switching characteristics of the analog switch or multiplexer, leading to charge injection, clock feedthrough, or aperture delay errors.
Maintenance Indicators
  • Drifting or unstable output voltage during the hold phase, indicating capacitor or switch degradation.
  • Increased noise, glitches, or distortion in the sampled output signal, suggesting component failure or power supply issues.
Engineering Tips
  • Use high-quality, low-leakage capacitors with low dielectric absorption (e.g., polypropylene or Teflon) and implement regular calibration to compensate for drift.
  • Select analog switches with minimal charge injection and feedthrough, ensure clean and stable power supplies, and maintain proper signal conditioning at the input.

Compliance & Manufacturing Standards

Reference Standards
IEC 61000-4-30: Electromagnetic compatibility (EMC) - Testing and measurement techniques - Power quality measurement methods ISO 9001: Quality management systems - Requirements CE Marking: Conformity assessment for products sold in the European Economic Area
Manufacturing Precision
  • Hold step accuracy: +/-0.1% of full scale
  • Aperture time: +/-5 nanoseconds
Quality Inspection
  • Signal integrity analysis using high-speed oscilloscope
  • Temperature drift test across operating range (-40°C to +85°C)

Factories Producing Sample and Hold Circuit

Verified manufacturers with capability to produce this product in China

✓ 96% Supplier Capability Match Found

S Sourcing Manager from Australia Feb 17, 2026
★★★★★
"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Sample and Hold Circuit so far."
Technical Specifications Verified
P Procurement Specialist from Singapore Feb 14, 2026
★★★★☆
"Testing the Sample and Hold Circuit now; the technical reliability results are within 1% of the laboratory datasheet. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Germany Feb 11, 2026
★★★★★
"Impressive build quality. Especially the technical reliability is very stable during long-term operation."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

5 sourcing managers are analyzing this specification now. Last inquiry for Sample and Hold Circuit from Germany (1h ago).

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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 precise moment and maintains that voltage level constant for subsequent analog-to-digital conversion or processing stages.

What materials are commonly used in Sample and Hold Circuits?

These circuits typically use semiconductor silicon for switches and integrated components, along with capacitors made from materials like poly-silicon or metal for the holding function.

What are the key components in a Sample and Hold Circuit BOM?

The essential components include a sampling switch to capture the signal, a holding capacitor to maintain the voltage, and a buffer amplifier to prevent loading and preserve signal integrity.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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