Signal Redriver Sleep Mode Power Management
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Solution Overview
Problem
Current signal redrivers in high-speed transmission systems, such as PCIe buses, lack a low-power SLEEP mode, leading to increased power consumption and potential connection failures due to long start-up times when turned off, which does not comply with terminal resistor specifications.
Innovation Solution
A signal redriver system that includes a monitoring circuit to determine entry into a SLEEP mode based on control signals, maintaining continuous coupling of the terminal resistor to the high-speed receiving end, reducing power consumption while ensuring compliance with terminal impedance specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the entire signal redriver is turned off to save power, then power consumption is reduced, but the terminal resistor does not comply with PCIe specification and start-up time becomes overly long
Solution Approach 1:
The signal redriver is divided into multiple independent modules: terminal resistor module, high-speed signal receiving module, high-speed signal transmitting module, and control module. This segmentation allows selective power management where only necessary modules remain active during low-power states, enabling power savings without completely shutting down the device and avoiding connection failures.
Solution Approach 2:
The signal redriver implements dynamic power management with multiple operational modes (normal mode and sleep mode) that can switch based on system requirements. The control module dynamically adjusts the operating state of different modules, allowing the device to adapt its power consumption and performance characteristics to current needs while maintaining compliance with specifications.
2Use of energy by stationary object
If the entire signal redriver is turned off directly, then power consumption is reduced immediately, but the start-up time required for turning on becomes overly long
Solution Approach 1:
The terminal resistor module remains continuously powered and coupled to the high-speed signal receiving end even when other modules are in sleep mode. This preliminary maintenance of critical components ensures that when the device needs to wake up from sleep mode, the terminal resistor is already ready, significantly reducing the start-up time while still achieving substantial power savings by shutting down non-critical modules.
3Use of energy by stationary object
If the entire signal redriver is turned off, then power consumption is reduced, but connection failure or PCIe disconnection occurs
Solution Approach 1:
By segmenting the signal redriver into independent modules, the invention allows critical functions (terminal resistor) to remain active while non-critical functions are powered down. This selective operation maintains PCIe connection stability and compliance with specifications while achieving power reduction goals.
Solution Approach 2:
The control module acts as an intermediary that manages the transition between normal and sleep modes, ensuring that necessary components remain operational to maintain PCIe connection integrity while allowing power savings when full functionality is not required.
Data Source
AI summary
The high-speed transmission system includes a transmitting device, a receiving device, and the signal redriver. The signal redriver includes a terminal resistor. A high-speed receiving end and a high-speed transmitting end of the signal redriver are respectively coupled to a high-speed transmitting end of the transmitting device and a high-speed receiving end of the receiving device. The signal redriver is coupled to a control signal transceiving end of the transmitting device and a control signal transceiving end of the receiving device. The signal redriver monitors a control signal transmitted between the transmitting device and the receiving device and determines whether to enter a SLEEP mode based on the control signal. The terminal resistor of the signal redriver in the SLEEP mode is continuously coupled to the high-speed receiving end of the signal redriver.