Passive Echo Cancellation Circuit for Gigabit Ethernet
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Full duplex communication systems like Gigabit Ethernet face echo impairment due to simultaneous data transmission and reception, leading to signal interference, which existing active echo cancellation circuits address but at the cost of complexity, higher manufacturing costs, and increased power consumption.
Innovation Solution
A passive echo cancellation device using a simple circuit configuration with passive elements, such as resistors or capacitors, generates an offset signal to eliminate the transmit signal from the receive signal, effectively canceling echo impairment without active components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active echo cancellation circuits with operational amplifiers and transistors are used, then echo cancellation performance is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the active elements (operational amplifiers and transistors) from the echo cancellation circuit, retaining only the essential passive elements (resistors and capacitors) needed for echo cancellation functionality. This extraction simplifies the circuit construction while maintaining the core echo cancellation capability.
Solution Approach 2:
The patent replaces expensive and complex active components with inexpensive passive components (resistors and capacitors). These passive elements are simpler, cheaper, and more reliable alternatives that achieve the same echo cancellation function without requiring complex active circuitry.
2Reliability
If active echo cancellation circuits are used, then echo cancellation performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent substitutes expensive active components (operational amplifiers and transistors) with inexpensive passive components (resistors and capacitors). This substitution dramatically reduces the bill of materials cost and simplifies the manufacturing process, making the echo cancellation circuit more cost-effective while maintaining functional performance.
3Reliability
If active echo cancellation circuits are used, then echo cancellation performance is improved, but power consumption increases
Solution Approach 1:
The patent removes the active elements that consume power (operational amplifiers and transistors) from the circuit, retaining only passive elements. Passive components do not require power supply and consume negligible power, thereby eliminating the power consumption issue while preserving the echo cancellation function through passive signal processing.
Data Source
AI summary
The present invention refers to a passive echo cancellation device for use in a full-duplex communication system and its signal transceiving method. The full-duplex communication system comprises a transmitting end for sending a transmit signal to a wiring interface, and a receiving end for accepting a receive signal from the wiring interface. The passive echo cancellation device comprises an offset-signal-generating circuit and a passive echo cancellation circuit composed of a plurality of passive components. The offset-signal-generating circuit generates an offset signal according to the transmit signal. The passive echo cancellation circuit is serially connected between the wiring interface and the receiving end, and is connected with the offset-signal-generating circuit. The passive echo cancellation circuit receives the offset signal in such a manner that an echo signal contained in the receive signal coming from the wiring interface is cancelled by mean of the offset signal, so as to generate an output signal containing merely the signal characteristics of the receive signal.