Editorial Technical Reference

Buffer Amplifier

This page explains how Buffer Amplifier 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 component that isolates the input from the output while providing impedance matching and signal integrity in analog systems.

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Product Specifications

Technical details and manufacturing context for Buffer Amplifier

Definition
In a Sample and Hold Circuit, the Buffer Amplifier serves as a critical interface component that prevents loading effects on the sampling capacitor. It maintains the sampled voltage level during the hold phase by providing high input impedance to the capacitor and low output impedance to the subsequent stages, ensuring minimal voltage droop and accurate signal preservation. The Buffer Amplifier typically uses an operational amplifier in unity-gain configuration (voltage follower). During the sample phase, it quickly charges the sampling capacitor to the input voltage. During the hold phase, it presents an extremely high input impedance to the capacitor, preventing discharge through the amplifier's input, while providing a low-impedance output to drive subsequent circuitry without affecting the held voltage. This component is used in analog signal processing applications where signal integrity is critical. It is manufactured using semiconductor silicon, with copper leads and plastic encapsulation. Key parameters include supply voltage of ±2.5 to ±18 V DC, supply current of 1.5 to 8 mA, bandwidth of 10 to 100 MHz, slew rate of 5 to 50 V/µs, input offset voltage of 0.1 to 5 mV, input bias current of 0.5 to 50 nA (for FET input types), output impedance of 0.1 to 10 Ω, input impedance of 10^9 to 10^12 Ω, operating temperature range of -40 to 85 °C, gain accuracy of ±0.1%, package type SOT-23-5, and weight of 0.01 to 0.05 g. These values are reference ranges and must be verified for the specific model and application. Always confirm with the legal manufacturer or supplier.
Working Principle
The Buffer Amplifier operates as a voltage follower using an operational amplifier with unity gain. In a sample-and-hold circuit, during the sample phase, the amplifier's output charges the sampling capacitor to the input voltage. During the hold phase, the amplifier's high input impedance (10^9 to 10^12 Ω) prevents the capacitor from discharging through the input, while its low output impedance (0.1 to 10 Ω) allows driving subsequent stages without loading the held voltage. This ensures minimal voltage droop and accurate signal preservation.
Common Materials
Semiconductor silicon, Copper, Plastic encapsulation
Technical Parameters
ParameterTypical rangeNotes & selection driver
Supply Voltage±2.5–±18 V DCDual supply required for bipolar operation
Supply Current1.5–8 mAQuiescent current per amplifier
Bandwidth10–100 MHzSmall-signal -3 dB bandwidth
Slew Rate5–50 V/µsTypical for unity-gain buffer
Input Offset Voltage0.1–5 mVMax over temperature
Input Bias Current0.5–50 nAFor FET input types
Output Impedance0.1–10 ΩLow output impedance for driving loads
Input Impedance10^9–10^12 ΩHigh input impedance for isolation
Operating Temperature Range-40–85 °CIndustrial grade
Gain Accuracy±0.1 %For unity gain buffer
Package TypeSOT-23-5Small outline package
Weight0.01–0.05 gTypical for SOT-23 package

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

Components / BOM
  • Operational Amplifier
    Core amplification element providing high gain and input/output characteristics
    Material: Semiconductor silicon
  • Feedback Network Part
    Configures the amplifier for unity gain operation
    Material: Copper traces, resistors
  • Power Supply Pins Part
    Provide operating voltage to the amplifier circuitry
    Material: Copper, gold plating
  • Input Protection Part
    Prevents damage from voltage spikes and electrostatic discharge
    Material: Diodes, resistors

Applied To / Applications

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

Sample and Hold Circuit
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Sample-and-Hold (S/H) Circuit
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Output Buffer/Stage
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Sample-and-Hold Circuit
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (electronic component)
other spec: Supply Voltage: ±5V to ±18V, Bandwidth: DC to 100MHz typical
temperature: -40°C to +125°C (operational range)
Media Compatibility
✓ Analog signal conditioning circuits ✓ Impedance matching networks ✓ Test and measurement equipment
Unsuitable: High-voltage power distribution systems (>100V)
Sizing Data Required
  • Input impedance requirement (Ω)
  • Output load impedance (Ω)
  • Required bandwidth/slew rate (Hz/V/μs)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal degradation of internal components
Cause: Excessive heat buildup due to inadequate cooling, overloading, or poor ventilation leading to component failure or performance drift
Signal distortion or output instability
Cause: Degradation of internal capacitors, aging of semiconductor components, or contamination of electrical contacts affecting signal integrity
Maintenance Indicators
  • Audible humming or buzzing from the unit indicating potential transformer or capacitor issues
  • Visible overheating signs (discoloration, warping) or erratic output readings on connected monitoring equipment
Engineering Tips
  • Implement regular thermal monitoring using infrared cameras or temperature sensors to detect early heat-related issues before component failure
  • Establish preventive maintenance schedule for cleaning internal components, verifying calibration, and replacing aging capacitors/connectors per manufacturer specifications

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ANSI/ISA-95.00.01-2010 - Enterprise-control system integration DIN EN 61000-6-2:2019 - Electromagnetic compatibility (EMC)

Quoted from the published standard.

Manufacturing Precision
  • Gain accuracy: +/-0.5 dB
  • Output impedance: 50 ohms +/-5%
Quality Inspection
  • Frequency response test
  • Signal-to-noise ratio measurement

Manufacturers of Buffer Amplifier

Manufacturer profiles associated with Buffer Amplifier.

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Frequently Asked Questions

What is the primary function of a Buffer Amplifier in a sample and hold circuit?

It isolates the sampling capacitor from subsequent stages, preventing loading effects and maintaining the held voltage during the hold phase.

What are typical input and output impedance values?

Input impedance is typically 10^9 to 10^12 Ω, and output impedance is 0.1 to 10 Ω, as listed in the reference parameters.

What supply voltage is required?

The reference range is ±2.5 to ±18 V DC, requiring a dual supply for bipolar operation.

How should I verify the specifications for my application?

Consult the legal manufacturer or supplier to confirm model-specific values, as the listed parameters are reference ranges.
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
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