Input Buffer Amplifier for Sample-and-Hold Systems

Product Specifications

Technical details and manufacturing context for Input Buffer Amplifier

Definition

The Input Buffer Amplifier is a critical component within a Sample-and-Hold Amplifier (SHA) system. Its primary function is to present a high input impedance to the source signal, preventing loading effects, while providing a low output impedance to drive the sampling switch and hold capacitor. This ensures accurate signal acquisition without distortion or attenuation during the sample phase. The buffer amplifier, typically implemented as a unity-gain voltage follower using an operational amplifier, accepts the analog input voltage and provides current gain to drive the subsequent stage. During the 'sample' command, it actively charges the hold capacitor through the switch to the input voltage level. Its high-speed response and low output impedance are crucial for minimizing acquisition time and settling errors. This component is used in data acquisition systems, analog-to-digital converters, and other precision analog circuits where signal integrity is paramount. The device operates from a dual supply voltage of ±5 to ±15 V DC, with an input offset voltage of ≤0.5 mV and an input bias current of ≤1 nA. It offers a bandwidth of ≥10 MHz and a slew rate of ≥20 V/µs, ensuring fast and accurate signal tracking. The output voltage swing and input voltage range are both ±3.5 to ±13.5 V, depending on supply and load. The operating temperature range is -40 to 85 °C, suitable for industrial environments. The input impedance is ≥10^12 Ω, preventing signal loading, while the output impedance is ≤1 Ω, enabling efficient driving of the sampling capacitor. Total harmonic distortion is ≤0.01% at 1 kHz with a 2 Vpp output. The component is available in an SOP-8 package. Materials used include semiconductor silicon, copper, and plastic encapsulation. For specific applications, verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The buffer amplifier operates as a unity-gain voltage follower, using an operational amplifier with negative feedback. It presents a high input impedance to the source, drawing negligible current, and provides a low output impedance to drive the sampling switch and hold capacitor. During the sample phase, the amplifier charges the hold capacitor to the input voltage through the switch. Its high slew rate and bandwidth ensure rapid settling, while low offset and bias currents maintain accuracy.

Common Materials

Semiconductor Silicon, Copper, Plastic (Encapsulation)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	±5–±15 V DC	Dual supply required for full signal swing
Input Offset Voltage	≤0.5 mV	Lower offset improves accuracy
Input Bias Current	≤1 nA	Low bias current minimizes source loading
Bandwidth	≥10 MHz	Sufficient for fast sample-and-hold acquisition
Slew Rate	≥20 V/µs	High slew rate reduces settling time
Output Voltage Swing	±3.5–±13.5 V	Depends on supply voltage and load
Input Voltage Range	±3.5–±13.5 V	Common-mode range limited by supply
Operating Temperature Range	-40–85 °C	Industrial grade
Input Impedance	≥10^12 Ω	High impedance prevents signal loading
Output Impedance	≤1 Ω	Low output impedance drives sampling capacitor
Total Harmonic Distortion	≤0.01 %	At 1 kHz, 2 Vpp output
Package Type	SOP-8	Industry standard for small outline

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 Part
Provides the high gain, high input impedance, and low output impedance characteristics of the buffer.

Material: Semiconductor (Silicon)
Feedback Network Part
Typically a direct connection for unity-gain voltage follower configuration, setting the closed-loop gain to 1.

Material: Metal (e.g., Aluminum/Copper traces)
Bias Circuitry Part
Provides the proper DC operating points (quiescent currents/voltages) for the amplifier transistors.

Material: Semiconductor (Silicon), Resistors (Doped Silicon/Thin Film)
Output Stage
A push-pull or similar stage designed to source/sink the current needed to charge the hold capacitor quickly.

Material: Semiconductor (Silicon)

Applied To / Applications

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

Sample-and-Hold Amplifier

View system integration details

Manufacturers of Input Buffer Amplifier

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Frequently Asked Questions

What is the primary function of an Input Buffer Amplifier?

It isolates the input signal source from the sampling circuit, providing high input impedance to prevent loading and low output impedance to drive the sampling switch and hold capacitor.

What are the typical supply voltage requirements?

The device typically requires a dual supply voltage of ±5 to ±15 V DC, as listed in the directory. Confirm exact requirements with the manufacturer.

What package types are available?

The directory lists an SOP-8 package. Other package options may exist; verify with the supplier.

How does the buffer amplifier affect signal accuracy?

It minimizes loading errors due to high input impedance and low bias current, and provides low output impedance for fast charging of the hold capacitor, reducing acquisition time and settling errors.

Data Basis

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

Preliminary Technical Classification

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pressure:	Not applicable (electronic component)
other spec:	Input impedance: >1 MΩ, Bandwidth: DC to 100 MHz, Supply voltage: ±5V to ±15V
temperature:	-40°C to +125°C (operational range)

Input Buffer Amplifier

Product Specifications

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