POD Termination with Adaptive Reference Voltage for I/O Channels
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Solution Overview
Problem
Current flash memory systems face challenges in achieving high performance and low power consumption due to improper impedance matching in I/O channels, particularly at microwave frequencies, leading to signal reflections and degraded transmission speed.
Innovation Solution
Implementing pseudo open-drain (POD) termination with adaptive reference voltage adjustments in receiver circuits to alleviate non-linear driver issues, reducing power consumption and improving signal integrity by renormalizing asymmetric signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional center-tapped termination is used in I/O channels, then impedance matching is achieved, but power consumption is high
Solution Approach 1:
The patent changes the termination configuration from conventional center-tapped to pseudo open-drain (POD) termination, modifying the electrical parameters of the I/O channel to reduce power consumption while maintaining signal integrity through adaptive reference voltage adjustment
Solution Approach 2:
The patent introduces adaptive reference voltage adjustment that dynamically compensates for signal asymmetry caused by POD termination and non-linear drivers, allowing the system to adapt to varying operating conditions and maintain optimal performance
2Use of energy by moving object
If POD termination is used to reduce power consumption, then power efficiency improves, but signal asymmetry and non-linear driver issues arise
Solution Approach 1:
The patent implements adaptive reference voltage adjustment that responds to signal conditions in the I/O channel, automatically compensating for asymmetry and non-linear effects to maintain signal integrity while using POD termination
Solution Approach 2:
The patent dynamically adjusts the reference voltage parameter to compensate for the asymmetric signal levels caused by POD termination, transforming the signal characteristics to restore proper logic level differentiation
3Productivity
If high speed data transmission is implemented in multi-die systems, then productivity increases, but signal reflections and transmission degradation occur
Solution Approach 1:
The patent employs adaptive reference voltage adjustment that dynamically compensates for signal degradation and reflections in high-speed multi-die I/O channels, maintaining signal quality despite increased transmission speeds
Solution Approach 2:
The patent modifies the reference voltage parameter adaptively to counteract signal reflections and transmission losses, enabling high-speed data transmission while maintaining signal integrity across multiple dies
Data Source
AI summary
Each I/O channel between a controller and one or more memory dice of a memory device has a driver on one end and a receiver at the other end. The receiver is optionally terminated with a pseudo open-drain (“POD”) termination instead of the conventional center-tapped (“CTT”) termination to save energy. During a read operation, data is driven from the memory die to a POD terminated receiver circuit in the controller. With POD termination, the degradation in performance due to the more non-linear driver in the memory die, fabricated for example in the NAND technology processing, is alleviated by an adaptive reference voltage level adjustment in the receiver circuit of the controller. Optionally, the receiver circuit of a memory die is also provided with an adaptive reference level adjustment.