Differential Receiver Common-Mode Noise Measurement Circuit
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Solution Overview
Problem
High-speed differential signal data communication interfaces face challenges in effectively measuring and canceling common mode noise, which can lead to data errors due to inadequate noise immunity.
Innovation Solution
A receiver design for high-speed data communication interfaces includes a differential data signal input, termination resistors, and a noise measurement node to detect common mode noise at the reference voltage node, allowing for effective noise cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common mode noise measurement is implemented in high-speed differential signal data communication interfaces, then noise immunity is improved, but device complexity increases due to additional measurement nodes and circuitry
Solution Approach 1:
The reference voltage node serves multiple functions: it provides the reference potential for differential signal reception and simultaneously enables common mode noise measurement. By making the measurement node multifunctional rather than adding a separate dedicated measurement structure, the patent achieves noise immunity improvement without proportionally increasing device complexity.
Solution Approach 2:
The existing reference voltage node and termination resistor network in the differential receiver are utilized to provide common mode noise measurement capability. The system uses its own existing structures (reference voltage node, termination resistors) to perform the measurement function, rather than requiring entirely separate measurement equipment, thereby reducing the complexity increase.
2Reliability
If common mode noise detection capability is added to the receiver, then data error reduction is achieved, but manufacturing complexity increases
Solution Approach 1:
The reference voltage node is designed to serve dual purposes: maintaining reference potential for signal reception and enabling common mode noise detection. This multi-functionality means that a single existing structure performs multiple roles, avoiding the need for separate dedicated measurement hardware that would complicate manufacturing.
Solution Approach 2:
The common mode noise measurement function is extracted and performed through the existing reference voltage node rather than requiring additional external measurement equipment. By utilizing an already-present node in the receiver architecture, the patent avoids adding complex manufacturing steps while still achieving noise detection capability.
Data Source
AI summary
A receiver for a high-speed data communication interface includes a differential data signal input, a first termination resistor, a second termination resistor, and a noise measurement node. The differential data signal input includes a positive signal input and a negative signal input. The first termination resistor terminates the positive signal input to a reference voltage node. The second termination resistor terminates the negative signal input to the reference voltage node. The noise measurement node is coupled to detect common mode noise at the reference voltage node.