PCB Passive Filter Layout for Storage Interface Signal Integrity
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Solution Overview
Problem
Storage devices face challenges in enhancing signal characteristics and integrity, particularly in high-frequency signal transmission, due to variations in impedance and parasitic capacitance, which affect data transmission and reception between hosts and nonvolatile memory devices.
Innovation Solution
Incorporating passive filters, comprising filter resistors and capacitors, within the printed circuit board (PCB) between the storage controller and the connector, to equalize signals and improve signal integrity by matching impedance and reducing signal reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive filters are added to equalize signals and improve signal integrity, then signal linearity and integrity are enhanced, but device complexity increases
Solution Approach 1:
The patent combines multiple filter components (resistors and capacitors) into an integrated passive filter circuit board that is coupled between the storage controller and connector. This merging approach allows signal equalization functionality to be integrated into the existing device structure, improving signal integrity while minimizing the increase in overall device complexity through unified design.
Solution Approach 2:
The passive filter circuit board serves as an intermediary component between the storage controller and the connector. It mediates signal transmission by equalizing signals and matching impedance, thereby improving signal integrity without requiring modifications to the existing storage controller or connector designs, thus limiting the increase in device complexity.
2Manufacturing precision
If passive filters are used to match impedance and reduce signal reflections, then signal linearity is improved, but manufacturing complexity increases
Solution Approach 1:
The passive filter circuit board uses specific resistor and capacitor values to achieve impedance matching and signal equalization. By carefully selecting and adjusting these electrical parameters, the system achieves improved signal linearity and reduced reflections. The use of standard electronic components with well-defined parameters simplifies the manufacturing process while maintaining precision.
3Reliability
If passive filters are incorporated to improve data transmission quality, then signal integrity is enhanced, but power consumption increases
Solution Approach 1:
The passive filter circuit board uses passive components (resistors and capacitors) that do not require active power supply for operation. These components dissipate minimal power through resistive losses while providing signal equalization and impedance matching. The use of passive rather than active filtering components significantly reduces power consumption while maintaining data transmission quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The passive filters enhance signal linearity and integrity, reducing power consumption and improving data transmission quality between the storage device and the host, while maintaining compatibility with various communication protocols.
Implementation Method 1
at least one passive filter is provided in the PCB between the connector and the storage controller, and the at least one passive filter equalizes signals provided from the storage controller or provided to the storage controller
Implementation Method 2
improve signal integrity by matching impedance and reducing signal reflections
Data Source
Figure 1
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AI summary
A storage device is described. The storage device includes nonvolatile memory devices provided on a printed circuit board (PCB), a connector, a storage controller and at least one first passive filter. The connector is provided in the PCB and includes connection terminals. The storage controller is provided on the PCB, communicates with an external host through the connection terminals and controls the nonvolatile memory devices. The at least one first passive filter is provided in the PCB, is connected between the connector and the storage controller, and performs an equalization on either a signal provided to the storage controller or a signal provided from the storage controller.