RF Transceiver Circuit Signal Leakage Suppression
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Solution Overview
Problem
Existing RF signal transmitting/receiving circuits face challenges in suppressing transmission signals mixed in multiple reception paths, leading to interference and reduced reception sensitivity.
Innovation Solution
The implementation of a radio-frequency signal transmitting/receiving circuit that includes a power amplifier circuit, duplexers with transmission and reception filters, a distribution circuit that divides and delays the transmission signal, and coupling circuits to invert the phase and match the power of the mixed signal, ensuring it is substantially the same as the transmission signal, thereby suppressing the mixed signal in the reception path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple reception paths are used for multi-band reception, then reception capability in multiple bands is improved, but transmission signals leak into reception paths causing interference
Solution Approach 1:
The patent applies preliminary anti-action by generating a cancellation signal before the transmission signal leaks into the reception path. The cancellation signal is created by dividing the original transmission signal, inverting its phase, and adjusting its amplitude to match the leaked signal. This pre-prepared cancellation signal is then injected into the reception path to neutralize the harmful leakage before it interferes with reception.
Solution Approach 2:
The patent converts the harmful transmission signal leakage into a beneficial cancellation mechanism. By extracting a portion of the transmission signal, inverting its phase, and injecting it back into the reception path, the harmful leakage is transformed into a useful cancellation signal that actively suppresses interference and improves reception quality in multi-band operations.
2Device complexity
If a simple duplexer structure is used, then device complexity is reduced, but transmission signal suppression in reception paths becomes insufficient
Solution Approach 1:
The patent introduces an intermediary cancellation signal generation system between the power amplifier and the reception paths. This intermediary system includes a signal division unit, phase inversion unit, and amplitude adjustment unit that create a specialized cancellation signal. This mediator actively neutralizes the transmission signal leakage without requiring complex filtering modifications to the basic duplexer structure.
Solution Approach 2:
The patent segments the transmission signal path from the reception paths by creating a separate cancellation signal generation pathway. The original transmission signal is divided into two portions: one goes to the power amplifier for transmission, and the other is processed through phase inversion and amplitude adjustment to create the cancellation signal. This segmentation allows the simple duplexer structure to be maintained while adding targeted suppression capability.
Data Source
AI summary
An RF signal transmitting/receiving circuit includes: at least one power amplifier circuit that amplifies and outputs an RF transmission signal; duplexers each including a transmission filter that passes the RF transmission signal amplified by the power amplifier circuit, and a reception filter that passes an RF reception signal; at least one distribution circuit that divides the RF transmission signal input to the power amplifier circuit and outputs a first signal; a signal output circuit that outputs, based on the first signal, in at least one transmission path among transmission paths of a plurality of the RF reception signals, at least one second signal that has substantially a same delay amount, an inverted phase, and substantially same power as the RF transmission signal mixed in the RF reception signal; and coupling circuits that couple the second signal to the RF reception signal transmitted in the at least one transmission path.