Passive Signal Transceiver Circuit for Echo Cancellation
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Solution Overview
Problem
In D2D links with SBD mode, outbound signals interfere with inbound signals, causing echo signals that degrade reception quality, and existing methods using active components lead to signal-dependent nonlinearity and high power consumption.
Innovation Solution
A signal transceiver with a driver and an interference removal circuit composed of passive components, including split-termination resistors and passive circuits, to remove echo signals by splitting outbound signals and using adjustable capacitors and resistors to enhance impedance matching and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active components are used in the interference removal circuit, then the echo signal removal effectiveness is improved, but signal-dependent nonlinearity and power consumption increase
Solution Approach 1:
The patent replaces active electronic components (such as amplifiers and active filters) with passive components (resistors, capacitors, and inductors) to construct the interference removal circuit. This substitution eliminates the need for power-consuming active elements while maintaining the circuit's ability to remove echo signals through passive signal processing techniques.
Solution Approach 2:
The patent employs simple passive components that are inherently low-cost and require no external power supply, replacing complex active components that consume significant power. The passive circuit architecture uses basic electrical elements that are universally available and require no maintenance or power management.
2Reliability
If active components are used in the interference removal circuit, then the echo signal removal effectiveness is improved, but signal-dependent nonlinearity increases
Solution Approach 1:
The patent replaces active electronic components (such as amplifiers and active filters) with passive components (resistors, capacitors, and inductors) to construct the interference removal circuit. This substitution eliminates the need for power-consuming active elements while maintaining the circuit's ability to remove echo signals through passive signal processing techniques.
3Reliability
If impedance matching is enhanced using adjustable capacitors and resistors, then signal transmission quality is improved, but device complexity increases
Solution Approach 1:
The patent employs adjustable capacitors and resistors to dynamically optimize impedance matching between different stages of the signal transceiver. By tuning the values of these passive components, the circuit achieves maximum power transfer and minimum signal reflection across varying operating conditions, thereby improving signal transmission quality without introducing active control mechanisms.
Data Source
AI summary
A signal transceiver includes a driver, an interference removal circuit and a split-termination resistor. The interference removal circuit includes a first passive circuit and a second passive circuit. The interference removal circuit has a first port connected to an output terminal of the driver, for receiving an outbound signal output by the driver. The interference removal circuit has a second port used to output the outbound signal and receive an inbound signal. The interference removal circuit has a third port and a fourth port that are used to output a recovery signal, where the recovery signal is the inbound signal after an interference caused by the outbound signal removed by the first passive circuit and the second passive circuit. The split-termination resistor is connected between the first port and the second port. The first passive circuit is connected between the first port and the third port, and the second passive circuit is connected between the second port and the fourth port.