Related Experiment Video
Updated: Sep 3, 2025
09:01
High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
Published on: April 16, 2017
7.8K
Investigation on Temperature Behavior for a GaAs E-pHEMT MMIC LNA
Qian Lin1, Lining Jia1, Haifeng Wu2
1College of Physics and Electronic Information Engineer, Qinghai Minzu University, Xining 810007, China.
Micromachines
|July 27, 2022
Summary
This study tested a Gallium Arsenide (GaAs) enhancement pseudomorphic high-electron-mobility transistor (E-pHEMT) low-noise amplifier (LNA) under cold alpine conditions. Performance degraded with increasing temperature, except for stability and output third-order intersection point (OIP3).
Area of Science:
- Electrical Engineering
- Materials Science
- Semiconductor Physics
Background:
- Monolithic Microwave Integrated Circuits (MMICs) are crucial for advanced electronics.
- Understanding MMIC performance under extreme temperatures, like alpine conditions, is vital for reliable operation.
- Gallium Arsenide (GaAs) enhancement pseudomorphic high-electron-mobility transistors (E-pHEMTs) are commonly used in MMICs.
Purpose of the Study:
- To investigate the temperature-dependent performance of a 0.4-3.8 GHz GaAs E-pHEMT low-noise amplifier (LNA) under simulated alpine conditions.
- To analyze key performance parameters including DC characteristics, S-parameters, stability, RF output, OIP3, and noise figure (NF).
- To provide insights for reliable MMIC design in cold environments.
Main Methods:
- Testing a 0.4-3.8 GHz GaAs E-pHEMT LNA across a temperature range from -39.2 °C to 23 °C.
- Detailed analysis of direct current (DC) characteristics, S-parameters, stability, radio frequency (RF) output, output third-order intersection point (OIP3), and noise figure (NF).
- Correlating performance changes with variations in two-dimensional electron gas mobility (μ).
Main Results:
- DC characteristics, small-signal gain (S21), RF output, and noise figure (NF) deteriorated as temperature increased.
- Two-dimensional electron gas mobility (μ) decreased with rising temperatures, explaining the performance degradation.
- Stability and output third-order intersection point (OIP3) showed improved performance with increasing temperature due to specific design features.
Conclusions:
- The performance of the tested MMIC LNA is significantly affected by temperature variations typical of alpine environments.
- While most parameters degrade, specific design choices enhance stability and OIP3 at higher temperatures within the tested range.
- Strategies to mitigate performance degradation are necessary for the successful application of MMIC LNAs in cold climates.
Related Concept Videos
01:27Biasing of Metal-Semiconductor Junctions
328
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
328
01:16Biasing of P-N Junction
800
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
800
01:23Small-Signal Analysis of MOSFET Amplifiers
727
In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
727