Symmetrical Matching Circuits for Low-Loss Bidirectional Amplifiers
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Solution Overview
Problem
High-frequency signals in wireless communication devices are attenuated due to reflection between components, necessitating bidirectional amplifiers that can switch between transmission and reception modes while maintaining efficient signal amplification and minimizing signal loss.
Innovation Solution
A bidirectional amplifier with symmetrical matching circuits, comprising first and second matching circuits with complementary structures and inductors having negative mutual inductance, and bias circuits that control voltage and power supply signals to optimize amplification in both modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a bidirectional amplifier uses different matching circuits for transmission and reception modes, then amplification efficiency is improved for each mode, but device complexity increases and the amplifier cannot operate efficiently in both directions simultaneously
Solution Approach 1:
The patent applies asymmetry by configuring the first matching circuit for low noise performance at the input terminal during reception mode, while the second matching circuit is configured for power amplification at the output terminal during transmission mode. This asymmetric configuration allows the amplifier to optimize performance for each operational mode while maintaining a single bidirectional structure.
Solution Approach 2:
The patent implements dynamics by enabling the bidirectional amplifier to switch between transmission and reception modes, where the amplifier circuit can amplify signals in either direction. The matching circuits are designed to adapt their function based on the operational mode, allowing the same hardware to dynamically optimize for either low noise or power amplification depending on the signal direction.
2Device complexity
If high-frequency signals are transmitted without matching between components, then device complexity is reduced, but signal attenuation increases due to reflection
Solution Approach 1:
The patent applies local quality by designing specific matching circuits with particular components (inductors and capacitors) at each terminal to address local impedance matching requirements. The first matching circuit is optimized for the input terminal characteristics while the second matching circuit is optimized for the output terminal characteristics, ensuring minimal reflection and signal attenuation at each interface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The amplifier achieves reduced signal transmission loss and improved amplification efficiency by utilizing symmetrical matching circuits and bias control, enhancing transconductance and magnetic fluxes for both transmission and reception modes.
Implementation Method 1
the first inductor may have a negative mutual inductance with respect to the second inductor, and the third inductor may have a negative mutual inductance with respect to the fourth inductor
Data Source
AI summary
Disclosed is a bidirectional amplifier. The bidirectional amplifier includes a first matching circuit, a second matching circuit, an amplifier circuit connected between the first matching circuit and the second matching circuit, that amplifies a first input signal received from the first matching circuit to output the amplified first input signal to the second matching circuit, and that amplifies a second input signal received from the second matching circuit to output the amplified first input signal to the first matching circuit, and the first and second matching circuits have a symmetrical structure and operate complementary to each other.