Switchable Multi-Coil Transceiver Interface for PA-LNA Coupling
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Solution Overview
Problem
The design of multi-coil transformers for wireless transceivers faces a trade-off between power amplifier (PA) and low-noise amplifier (LNA) performance, where optimizing for one aspect compromises the other, due to the coupling factor between inductors affecting signal transmission and reception efficiency.
Innovation Solution
Incorporating a switchable additional inductor that couples or decouples from the multi-coil transformer depending on the operational mode, reducing effective coupling in transmit mode for improved PA performance and maintaining high coupling in receive mode for enhanced LNA performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coupling factor between inductors in the multi-coil transformer is increased to improve LNA performance, then signal reception efficiency is enhanced, but signal transmission efficiency deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the coupling factor adjustable rather than fixed. A switchable additional inductor is introduced that can be coupled or decoupled from the transformer based on operational mode. In receive mode, the additional inductor is coupled to increase the coupling factor and improve LNA performance. In transmit mode, the additional inductor is decoupled to reduce the coupling factor and improve PA performance, thus dynamically adapting the coupling factor to different operational requirements.
2Loss of energy
If the coupling factor between inductors is decreased to improve PA performance, then signal transmission efficiency is enhanced, but signal reception efficiency deteriorates
Solution Approach 1:
The patent resolves this contradiction by implementing a dynamic configuration where the additional inductor's coupling state changes based on operational mode. During transmit operations, the switch decouples the additional inductor, reducing the coupling factor to minimize energy loss and improve PA efficiency. During receive operations, the switch couples the additional inductor, increasing the coupling factor to enhance signal reception efficiency and LNA performance.
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
This approach allows for simultaneous high performance of both the PA and LNA, optimizing signal transmission and reception efficiency without compromising one for the other.
Implementation Method 1
a first inductor magnetically coupled with the second inductor, the second inductor magnetically coupled with the third inductor
Data Source
AI summary
An apparatus includes a transformer including a first inductor, a second inductor, and a third inductor. The apparatus also includes a power amplifier having an output coupled to the first inductor, a low-noise amplifier having an input coupled to a first terminal of the third inductor, and a fourth inductor having a first terminal and a second terminal, wherein the second terminal of the fourth inductor is coupled to a second terminal of the third inductor. The apparatus also includes a switch coupled between the first terminal of the third inductor and the first terminal of the fourth inductor.