Capacitive Transceiver Interface With Switchable Termination
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Solution Overview
Problem
Existing communication systems with switchable termination resistances face challenges in reducing power consumption and mitigating high common mode voltages under electromagnetic interference, particularly in capacitively coupled transmission lines.
Innovation Solution
A transceiver design incorporating a switchable termination resistance circuit with series connected resistors and a capacitor, configured to disconnect the termination resistance during signal transmission, and a control module to manage the switch, optimizing power consumption and reducing common mode voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the termination resistance is connected at the transmitter side, then the reflections along the transmission line are reduced, but the transmitter power consumption increases
Solution Approach 1:
The termination resistance is made switchable between connected and disconnected states based on transmission mode. During receive mode, the termination resistance is connected to reduce reflections and improve signal quality. During transmit mode, the termination resistance is disconnected to reduce power consumption. This dynamic switching resolves the contradiction between maintaining signal quality and reducing power consumption.
Solution Approach 2:
The termination resistance is temporarily discarded (disconnected) during transmit mode when it is not needed for reflection reduction, and recovered (connected) during receive mode when it is needed for signal quality. This selective connection and disconnection allows the system to optimize performance for each operational mode without continuous power consumption.
2Use of energy by moving object
If the termination resistance is disconnected during transmission, then the power consumption is reduced, but the common mode voltage increases under electromagnetic interference
Solution Approach 1:
The termination resistance is split into two separate resistors connected in series between the transmission line terminals. This segmentation allows one resistor to remain connected during transmit mode while the other is disconnected, providing a compromise solution that reduces but does not eliminate power consumption, while also maintaining some level of common mode voltage suppression under electromagnetic interference.
Solution Approach 2:
Different parts of the termination resistance have different connection states during transmit mode. One resistor is connected to provide local suppression of common mode voltage, while the other is disconnected to reduce overall power consumption. This local differentiation resolves the contradiction by allowing simultaneous optimization of both power consumption and electromagnetic interference robustness in different parts of the circuit.
3Use of energy by moving object
If a switchable termination resistance is implemented, then the power consumption is optimized, but the device complexity increases
Solution Approach 1:
The switchable termination resistance functionality is merged with the existing transceiver circuitry. The switch is integrated into the transmission line interface, and the termination resistance shares the same physical location and control mechanism as other transmission components. This merging approach minimizes additional complexity while achieving power consumption optimization.
Data Source
AI summary
The disclosure relates to a transceiver physical layer interface. Example embodiments include a transmission line transceiver (401) comprising: first and second terminals (406a, 406b); a control module (416); an amplifier module (414) connected between the control module (416) and the first and second terminals (406a, 406b); a switchable termination resistance circuit (408, 410) connected between the first and second terminals (406a, 406b), the switchable termination resistance circuit (408, 410) comprising a termination resistance (408) connected in series with a switch (410) controllable by the control module (416); a pair of series connected resistors (418a, 418b) connected between the first and second terminals (406a, 406b); a capacitor (420) connected between a node (423) connecting the pair of series connected resistors (418a, 418b) and a common node (422), wherein the control module (416) is configured to open the switch (410) to disconnect the termination resistance (408) during transmission of a signal via a transmission line (403) capacitively connected to the first and second terminals (406a, 406b).