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Related Experiment Video

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2W HBT Power Amplifier Module with Dual Second Harmonic Suppression Technique.

Chul-Woo Byeon¹, Joon-Hyung Kim²

¹School of Electronics and Electrical Engineering, College of Engineering, Dankook University, Yongin-si 16890, Republic of Korea.

Sensors (Basel, Switzerland)

|February 26, 2025

Summary

This study introduces a high-power heterojunction bipolar transistor (HBT) power amplifier (PA) module for GSM/EDGE, achieving high output power and efficiency. The novel design enhances linearity and performance for mobile communication applications.

Keywords:

heterojunction bipolar transistor (HBT)linearity power amplifier (PA)power-added efficiency (PAE)

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Area of Science:

Electrical Engineering
Semiconductor Devices
Wireless Communication

Background:

High-power amplifiers are crucial for mobile communication systems like GSM/EDGE.
Existing power amplifier designs face challenges in achieving high efficiency and linearity at low supply voltages.
Heterojunction Bipolar Transistors (HBTs) offer potential for high-performance power amplification.

Purpose of the Study:

To design and present a high-power heterojunction bipolar transistor (HBT) power amplifier (PA) module for GSM/EDGE applications.
To achieve high output power and power-added efficiency (PAE) at low supply voltages.
To enhance linearity across a wide bandwidth without complex harmonic termination.

Main Methods:

Utilized a differential output stage HBT power amplifier design.
Implemented a transformer-based output matching network to combine differential signals.
Optimized a capacitor value at the transformer's center tap for enhanced linearity.
Integrated the PA with a low-pass filter and antenna switch for module performance.

Main Results:

Achieved 36 dBm output power with >40% PAE in GSM mode.
Delivered 28.5 dBm output power with >20% PAE in EDGE mode.
Attained an adjacent channel power ratio of -60 dBc at 400 kHz offset in EDGE mode.

Conclusions:

The proposed HBT PA module effectively meets the demanding requirements of GSM/EDGE applications.
The differential output stage and transformer-based matching network provide a robust solution for high-power, efficient amplification.
The design demonstrates excellent linearity and spectral purity, crucial for modern wireless communication standards.