Amplifier Core for Variable Gain Amplifiers

Q: What is the typical supply voltage range for the Amplifier Core?

The supply voltage range is 3.3–5 V, as listed in the directory. However, always confirm the exact requirement for your specific model with the manufacturer.

Q: How is the gain adjusted in this component?

The gain is adjustable via an external control interface, which modulates the operating point or feedback within the core circuit. The gain range is 0–60 dB, with an accuracy of ±0.5 dB.

Q: What is the operating temperature range?

The operating temperature range is -40 to 85 °C, and the storage temperature range is -55 to 125 °C. These are reference values; verify for your application.

Q: What package is available for the Amplifier Core?

The component is available in a QFN-24 package with dimensions 5x5 mm. The typical weight is 0.5–1.0 g. Confirm package availability with the supplier.

Product Specifications

Technical details and manufacturing context for Amplifier Core

Definition

The Amplifier Core is the essential internal component of a Variable Gain Amplifier (VGA) that performs the primary amplification of an input electrical signal. Its gain can be dynamically adjusted by external control signals, enabling the VGA to provide variable signal strength output. It forms the heart of the amplifier circuit, determining key performance characteristics such as gain range, linearity, bandwidth, and noise figure. This component is designed for integration into electronic systems requiring precise signal conditioning, such as communication equipment, test instrumentation, and radar systems. The core operates with a supply voltage of 3.3–5 V and draws a supply current of 10–50 mA at nominal conditions. It offers a gain range of 0–60 dB, adjustable via a control interface, with a gain accuracy of ±0.5 dB over the full range. The bandwidth extends from 0.1 to 1000 MHz at the -3 dB point, and the noise figure is 2–5 dB at maximum gain. The input and output impedances are both 50 Ω, with differential input and single-ended output configurations. The core is rated for an operating temperature range of -40 to 85 °C and a storage temperature range of -55 to 125 °C, with a relative humidity range of 5–95% non-condensing. It is available in a QFN-24 package measuring 5x5 mm, with a typical weight of 0.5–1.0 g. The core is constructed using semiconductor materials such as silicon or gallium arsenide, on a dielectric substrate, with metal interconnects. These specifications are reference values for directory purposes; actual performance may vary by model and application. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement or design-in.

Working Principle

The core typically consists of one or more active semiconductor devices (like transistors or operational amplifiers) configured in a circuit that multiplies the voltage, current, or power of an input signal. A control voltage or current, applied externally, modulates the operating point or feedback within this circuit, thereby changing its amplification factor (gain). This allows the overall VGA to adjust its output level without significant signal distortion. The gain adjustment mechanism may involve varying the bias point of the active devices or altering the feedback network. The core's design ensures stable operation across the specified frequency range and temperature extremes, maintaining linearity and noise performance. The control interface accepts analog or digital signals to set the desired gain, enabling precise signal conditioning in various applications.

Common Materials

Semiconductor (Silicon, GaAs, etc.), Dielectric Substrate, Metal Interconnects

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	3.3–5 V	Operating range for core circuitry
Supply Current	10–50 mA	At nominal supply voltage
Gain Range	0–60 dB	Adjustable via control interface
Gain Accuracy	±0.5 dB	Over full gain range
Bandwidth	0.1–1000 MHz	At -3 dB point
Noise Figure	2–5 dB	At maximum gain
Input Impedance	50 Ω	Differential
Output Impedance	50 Ω	Single-ended
Operating Temperature	-40–85 °C	Ambient
Storage Temperature	-55–125 °C	Non-operating
Relative Humidity	5–95 %	Non-condensing
Package Type	QFN-24	5x5 mm
Weight	0.5–1.0 g	Typical

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

Active Device Array
Provides the fundamental signal amplification through transistors or op-amps.

Material: Semiconductor (e.g., Silicon, GaAs)
Bias Network Part
Sets the DC operating point for the active devices.

Material: Resistors, Capacitors
Gain Control Interface
Accepts the external control signal and applies it to modulate the amplification.

Material: Metal traces, Control pins
Input/Output Matching Network
Optimizes power transfer and minimizes signal reflection at the core's ports.

Material: Inductors, Capacitors, Transmission lines

Application & selection

Application Fit & Sizing Matrix

Operational Limits

pressure:	Not applicable (electronic component)
other spec:	Supply Voltage: ±5V to ±15V, Bandwidth: DC to 100 MHz
temperature:	-40°C to +85°C

Media Compatibility

✓ RF signal processing ✓ Audio signal conditioning ✓ Test and measurement instrumentation

Unsuitable: High-voltage power transmission environments

Sizing Data Required

Required gain range (dB)
Input signal frequency (Hz)
Output load impedance (Ω)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Thermal Overstress

Cause: Inadequate cooling or excessive ambient temperatures leading to semiconductor junction overheating, causing performance degradation or catastrophic failure.

Electrolytic Capacitor Degradation

Cause: High ripple currents, elevated operating temperatures, or prolonged storage causing electrolyte evaporation, increased ESR, and eventual short/open circuit failure.

Maintenance Indicators

Audible high-frequency oscillation or squealing from the amplifier unit
Visible discoloration or bulging of capacitors on the circuit board

Engineering Tips

Implement forced air cooling with temperature-controlled fans to maintain core components below 85°C, and use thermal interface materials with proper mounting pressure
Replace electrolytic capacitors with polymer or solid-state alternatives in high-stress locations, and implement periodic ESR testing during preventive maintenance

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

CE Marking - EU Electromagnetic Compatibility Directive 2014/30/EU IEC 60268-3:2018 - Sound System Equipment - Amplifiers

Quoted from the published standard.

Manufacturing Precision

Output Power: +/- 3% of rated specification
Total Harmonic Distortion (THD): < 0.1% at rated power

Quality Inspection

Thermal Cycling Test - Verify stability across operating temperature range
Electrical Safety Test - Insulation resistance and dielectric strength verification

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.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Amplifier Core

Manufacturer profiles associated with Amplifier Core.

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Frequently Asked Questions

What is the typical supply voltage range for the Amplifier Core?

The supply voltage range is 3.3–5 V, as listed in the directory. However, always confirm the exact requirement for your specific model with the manufacturer.

How is the gain adjusted in this component?

The gain is adjustable via an external control interface, which modulates the operating point or feedback within the core circuit. The gain range is 0–60 dB, with an accuracy of ±0.5 dB.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C, and the storage temperature range is -55 to 125 °C. These are reference values; verify for your application.

What package is available for the Amplifier Core?

The component is available in a QFN-24 package with dimensions 5x5 mm. The typical weight is 0.5–1.0 g. Confirm package availability with the supplier.

Related equipment

Applied To / Applications

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

Variable Gain Amplifier (VGA)

View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

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.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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