Inductive Feedback Path for RF Amplifier Pre-Distortion Training
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Solution Overview
Problem
Existing pre-distortion training methods face challenges in capturing suitable feedback to characterize the non-linearity of RF amplifiers due to interference and power consumption issues in the feedback path, which affects signal quality and efficiency.
Innovation Solution
Implementing inductive coupling between the transmit and receive paths in a transceiver to provide pre-distortion training feedback, eliminating active circuitry like transimpedance amplifiers and reducing interference, thereby improving signal quality and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If active circuitry like transimpedance amplifiers is used in the feedback path, then signal amplification is achieved, but power consumption increases and interference is introduced
Solution Approach 1:
The patent extracts and removes active circuitry components (transimpedance amplifiers) from the feedback path, replacing them with passive inductive coupling elements. This extraction eliminates the power consumption and interference-generating components while maintaining the essential feedback function through magnetic coupling between transmit and receive paths.
Solution Approach 2:
The patent introduces an intermediary inductive coupling mechanism (magnetic field coupling) between the transmit and receive paths. This intermediary allows signal transfer without direct electrical connection, avoiding the need for active amplifying components in the feedback path and thereby reducing both power consumption and interference.
2Reliability
If traditional feedback paths with active circuitry are used, then signal quality can be maintained, but circuit space and power consumption increase
Solution Approach 1:
The patent removes bulky active circuitry components from the feedback path, significantly reducing the circuit space required. The inductive coupling implementation uses minimal passive elements (coupling inductors) compared to traditional active feedback circuits, achieving compact integration while maintaining signal quality for pre-distortion training.
Solution Approach 2:
The inductive coupling feedback path is self-sufficient, using magnetic field coupling to automatically transfer signals without requiring additional active amplifying components. This self-service mechanism maintains signal quality through the inherent properties of magnetic coupling while minimizing circuit space requirements.
3Use of energy by stationary object
If inductive coupling is used, then power consumption and circuit space are reduced, but signal feedback capability must be maintained
Solution Approach 1:
The patent uses magnetic field coupling as an intermediary to transfer feedback signals from the transmit path to the receive path. This inductive coupling mechanism preserves the essential signal information needed for pre-distortion training while consuming minimal power and occupying minimal circuit space, effectively maintaining feedback capability without the drawbacks of active circuitry.
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 inductive coupling method reduces power consumption and circuit space, enhances signal quality, and improves pre-distortion effectiveness by effectively canceling non-linear effects in RF amplifiers.
Implementation Method 1
a first amplifier having a first output that is inductively coupled to the receive path
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for pre-distortion training feedback via inductive coupling. An example apparatus includes a receive path; a transmit path comprising an amplifier having a first output that is inductively coupled to the receive path; a memory; and a processor coupled to the memory. The processor is configured to cause the apparatus to obtain a first signal, based on a second signal output by the amplifier, via the receive path being inductively coupled to the first output of the amplifier; determine a parameter for pre-distortion associated with the amplifier based at least in part on the first signal; pre-distort a third signal based at least in part on the parameter; amplify the pre-distorted third signal via the amplifier; and transmit the amplified third signal.