Signal Integrity Diagnostics Using Receiver-Side Margin Analysis
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Solution Overview
Problem
Existing signal integrity diagnostic systems for communication channels are slow, costly, and do not effectively assess the jitter tolerance of components, particularly the CDR module, leading to incomplete margin analysis and significant silicon real estate and power consumption.
Innovation Solution
A receiver-side diagnostic system comprising an autogain module, disturbance generator, summation module, clock and data recovery module, and data processor that automatically adjusts signal gain, adds a disturbance signal, and analyzes the resulting signal integrity, allowing for real-time assessment of available margin in communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional signal integrity diagnostic systems are used, then comprehensive margin analysis can be achieved, but the system becomes slow and consumes significant silicon real estate and power
Solution Approach 1:
The patent extracts the essential diagnostic function from complex traditional systems by implementing a simplified receiver-side diagnostic that measures signal integrity margin using only the receiver components already present in the communication system. This extraction approach eliminates the need for expensive, slow external test equipment while maintaining measurement accuracy through targeted measurement of the critical margin parameter.
Solution Approach 2:
The diagnostic system uses the receiver's own existing components (autogain module, CDR module, summation module) to perform self-diagnosis of signal integrity margin. By making the system self-testing rather than relying on external equipment, the patent achieves fast, integrated diagnostics without adding significant silicon real estate or power consumption.
2Measurement precision
If traditional diagnostic systems are used, then signal integrity can be assessed, but silicon real estate and power consumption increase significantly
Solution Approach 1:
The patent makes existing receiver components multi-functional by having the autogain module, summation module, and CDR module serve both their primary signal reception functions and the additional function of signal integrity margin measurement. This universality eliminates the need for dedicated diagnostic hardware, reducing silicon real estate and power consumption while maintaining assessment capability.
Solution Approach 2:
The receiver performs self-diagnosis using its own operational components during normal reception, eliminating the need for separate power-hungry diagnostic subsystems. The diagnostic function leverages the existing power budget of the receiver rather than requiring additional power resources.
3Measurement precision
If traditional diagnostic systems are used, then margin analysis can be performed, but device complexity and cost increase
Solution Approach 1:
The patent extracts the critical margin measurement function from complex external test systems and implements it within the receiver using simplified circuitry. By taking out only the essential measurement capability rather than replicating entire test systems, the patent reduces device complexity and cost while preserving margin analysis capability.
Solution Approach 2:
Existing receiver components are made multi-functional to perform both signal reception and margin measurement, eliminating the need for separate dedicated diagnostic hardware. This universality simplifies the overall device architecture and reduces component count, thereby lowering complexity and cost.
4Measurement precision
If receiver components are tested for jitter tolerance, then complete margin analysis is achieved, but traditional methods are slow and resource-intensive
Solution Approach 1:
The patent performs preliminary jitter tolerance testing by having the CDR module continuously evaluate its tolerance to injected jitter during normal operation. This preliminary, ongoing assessment eliminates the need for time-consuming separate test sequences, allowing fast determination of the signal integrity margin without significant time loss.
Solution Approach 2:
The diagnostic measurement of jitter tolerance is performed continuously during normal receiver operation rather than requiring interruption for separate testing. The useful action of signal reception continues uninterrupted while margin analysis proceeds simultaneously, eliminating time loss and maintaining system productivity.
Data Source
AI summary
Systems, methods and devices for diagnosing signal integrity of a communication channel are disclosed, as well as related systems, methods, and devices. A method includes receiving an input signal from a transmission line of the communication channel and performing an autogain function on the input signal to generate a regulated output signal with a pre-determined voltage amplitude. The method also includes adding a disturbance signal to the regulated output signal to generate a summation output. The method also includes digitizing the summation output and analyzing the digitized summation output to determine an error level.