QT140-DG

Product Overview

• Category: Electronic Component
• Use: Signal Amplification and Filtering
• Characteristics: High Gain, Low Noise, Compact Size
• Package: Dual-Gate MOSFET Transistor
• Essence: Amplify and Filter Weak Signals
• Packaging/Quantity: Individual Units

Specifications

• Type: N-Channel Dual-Gate MOSFET
• Maximum Drain-Source Voltage: 30V
• Maximum Gate-Source Voltage: ±20V
• Maximum Drain Current: 50mA
• Power Dissipation: 200mW
• Operating Frequency: Up to 1GHz
• Gain: 10dB
• Noise Figure: 2dB
• Input Capacitance: 0.8pF
• Output Capacitance: 1.2pF
• Pin Configuration: See below

Pin Configuration

The QT140-DG dual-gate MOSFET transistor has the following pin configuration:

+------------------+ G1 -| |- D G2 -| |- S +------------------+

• G1: Gate 1 (Input)
• G2: Gate 2 (Output)
• D: Drain
• S: Source

Functional Features

• High gain amplification of weak signals
• Low noise figure for improved signal quality
• Dual-gate design allows for precise control of amplification
• Wide operating frequency range up to 1GHz
• Compact size for space-constrained applications

Advantages

• Excellent signal amplification capabilities
• Low noise performance enhances signal quality
• Versatile application in various electronic circuits
• Compact size allows for integration into small devices
• Wide operating frequency range for diverse applications

Disadvantages

• Limited maximum drain current may restrict certain high-power applications
• Sensitivity to electrostatic discharge (ESD) requires proper handling and protection

Working Principles

The QT140-DG operates based on the principles of a dual-gate MOSFET transistor. It utilizes two gates, G1 and G2, to control the amplification of weak input signals. The first gate, G1, acts as an input stage, while the second gate, G2, serves as an output stage. By adjusting the voltage applied to each gate, the transistor can amplify and filter the input signal with high gain and low noise.

Detailed Application Field Plans

The QT140-DG is commonly used in various electronic circuits that require signal amplification and filtering. Some specific application fields include:

1. Communication Systems: Used in RF amplifiers and receivers to enhance weak signals.
2. Audio Equipment: Integrated into preamplifiers and audio signal processing circuits.
3. Instrumentation: Employed in measurement devices and sensors for signal conditioning.
4. Wireless Transmitters: Utilized in low-power transmitters for improved signal transmission.
5. Radar Systems: Incorporated in radar receivers for signal amplification and filtering.

Alternative Models

For alternative options to the QT140-DG, consider the following models:

1. QT120-DG: Similar dual-gate MOSFET transistor with lower gain but higher power handling capability.
2. QT160-DG: Dual-gate MOSFET transistor with higher gain and wider operating frequency range.
3. QT100-SG: Single-gate MOSFET transistor suitable for simpler amplification applications.

These alternative models provide different specifications and features to cater to diverse application requirements.

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