Signal Receiver Termination Switching to Prevent Power-Off Leakage
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Solution Overview
Problem
In signal transceivers, the undesired conduction path between the signal receiver and transmitter can lead to leakage current when the power is turned off, causing unnecessary power consumption and damage to circuit components.
Innovation Solution
A signal receiver design incorporating a termination switch pair, resistors, and a pull-down circuit that determines whether to pull down the control voltage to a reference voltage based on the power-on or power-off state, preventing the formation of a leakage path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the power supply of the signal receiver is turned off while the signal transmitter remains in the working state, then power consumption of the receiver is reduced, but an undesired conduction path is generated between the signal receiver and transmitter, leading to leakage current
Solution Approach 1:
The patent applies preliminary action by using a pull-down circuit to proactively discharge the control voltage on the common control end before the termination switch pair can form a conduction path. When the receiver power is turned off, the pull-down circuit immediately pulls the control voltage to ground level, preventing the switch pair from conducting and thus preventing leakage current before it can occur.
Solution Approach 2:
The patent uses the pull-down circuit as an intermediary component between the common control end and ground. This intermediary actively manages the control voltage level, ensuring that when the receiver is powered off, the control voltage is rapidly discharged through the pull-down circuit, thereby preventing the formation of the undesired conduction path between the transmitter and receiver.
2Reliability
If the termination switch pair is kept conductive to maintain signal reception capability, then signal receiving function is improved, but unnecessary leakage current occurs when the receiver is powered off
Solution Approach 1:
The patent applies dynamics by making the control voltage on the common control end dynamically adjustable. The pull-down circuit enables the control voltage to be rapidly discharged when the receiver is powered off, allowing the termination switch pair to transition from a conductive state during normal operation to a non-conductive state during power-off, thus adapting to different operational requirements and preventing leakage current.
3Device complexity
If a simple power switch is used to control the receiver power, then device complexity is reduced, but leakage current cannot be prevented when the receiver is powered off
Solution Approach 1:
The patent applies segmentation by dividing the power control function into two independent parts: a power switch for controlling the main power supply and a pull-down circuit for controlling the discharge path of the control voltage. This segmentation allows each component to perform its specific function independently - the power switch controls power delivery while the pull-down circuit manages voltage discharge - together effectively preventing leakage current without excessive complexity.
Data Source
AI summary
A signal receiver and a signal transceiver are provided, which may avoid unnecessary leakage current. The signal receiver includes a termination switch pair, a first resistor, a second resistor, and a pull-down circuit. The termination switch pair receives an operation power supply. The termination switch pair has a common control end. The first resistor is coupled between a first signal input end and the common control end. The second resistor is coupled between a second signal input end and the common control end. The pull-down circuit is coupled between the common control end and a reference voltage end. The pull-down circuit determines whether to pull down a first control voltage on the common control end to a reference voltage according to a power-on state or a power-off state of the signal receiver.