RF Transceiver Pre-Distortion Circuit Pin Segmentation
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Solution Overview
Problem
Existing RF transceiver circuits face challenges in obtaining and analyzing appropriate feedback signals for effective digital pre-distortion compensation, due to non-linear phenomena in external front-end modules (eFEM) causing signal distortion.
Innovation Solution
An RF transceiver circuit with a pre-distortion processing circuit that receives a feedback signal through a dedicated pin, calculates distortion information, and generates a compensation signal to perform pre-distortion compensation, utilizing a coupler and matching circuit to generate an accurate feedback signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RF signal is obtained within the eFEM for digital pre-distortion compensation, then the non-linear compensation can be performed, but the RF signal is easily affected by other coupling signals which affects the efficacy of compensation
Solution Approach 1:
The patent separates the feedback signal acquisition path from the main RF signal path by using a dedicated third pin for feedback signal input, distinct from the first pin (transmission signal input) and second pin (reception signal input). This segmentation isolates the pre-distortion compensation function from other signal processing functions, preventing coupling signal interference while maintaining compensation efficacy.
2Power
If an external front-end module (eFEM) is disposed between the RF transmitter and antenna for high power output, then power output is improved, but non-linear phenomena are generated causing greater distortion in RF signal
Solution Approach 1:
The patent implements digital pre-distortion compensation by calculating distortion information based on feedback signals and generating compensation signals in advance, before the transmission signal is sent to the eFEM. This preliminary action counteracts the non-linear effects that will be introduced by the eFEM, ensuring that the combined effect of pre-distortion and eFEM non-linearity results in linear output, thereby maintaining signal quality while achieving high power output.
Data Source
AI summary
A radio frequency (RF) transceiver circuit includes a transmission circuit, a reception circuit, and a pre-distortion processing circuit. The transmission circuit is arranged to generate a transmission signal, wherein the transmission signal is transmitted to an antenna through a first pin. The reception circuit is arranged to receive a reception signal through a second pin. The pre-distortion processing circuit is arranged to receive a feedback signal through a third pin, and calculate distortion information of the transmission signal according to the feedback signal in order to generate and transmit a compensation signal to the transmission circuit for performing a pre-distortion compensation operation, wherein the feedback signal is generated according to a coupling signal of the transmission signal.