Intermediated Ground Buffering for Inter-Domain Noise Isolation
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Solution Overview
Problem
Integrated circuits with multiple domains face noise coupling issues due to differing reference grounds, which impact signal timing and performance, as conventional buffering approaches fail to effectively isolate noise across both signal and ground paths.
Innovation Solution
A ground intermediating buffer system that generates intermediated grounds between circuit domains to reduce noise coupling, using a ground intermediator circuit to create a noise level intermediate between the two domains, coupled with a signal buffer to relay radiofrequency signals across the domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional buffering approaches are used to transfer signals between domains with different reference grounds, then signal transmission is enabled, but ground noise couples across domains impacting timing and performance
Solution Approach 1:
The patent introduces an intermediary ground reference between two domains with different ground references. This intermediary ground acts as a mediator that couples to both original ground references through resistors, creating a new reference point that reduces the noise coupling between domains while still enabling signal transmission. The intermediary ground effectively isolates the noise from one domain from affecting the other domain.
2Object-affected harmful factors
If domains share a common ground reference, then ground noise coupling is reduced, but domains with different noise characteristics cannot operate independently
Solution Approach 1:
The intermediary ground reference enables each domain to maintain its own independent ground reference while still providing a common reference point for signal buffering. This allows domains to operate independently with their own noise characteristics while the intermediary ground prevents excessive noise coupling, thus maintaining both domain independence and reduced noise coupling.
Solution Approach 2:
The ground reference system is segmented into multiple independent ground references (first domain ground, second domain ground) rather than forcing a single common ground. Each ground reference can be optimized for its specific domain's noise characteristics, and the intermediary ground provides the necessary coupling without requiring full consolidation of ground references.
3Reliability
If ground noise levels differ between domains, then each domain can be optimized for its specific noise environment, but noise transfer occurs through the buffer stage
Solution Approach 1:
The intermediary ground reference serves as a mediator that allows the buffer stage to operate with a ground reference that is optimized for the specific signal path, rather than being forced to use one of the original domain grounds. This intermediary reference reduces the noise transfer through the buffer by providing a ground that is electrically between the two domain grounds, thus minimizing the noise coupling path.
Data Source
AI summary
Techniques are described for ground-intermediating buffering that can effectively use the reference grounds of the circuit domains on either side of a buffer stage to generate one or more intermediated grounds for one or more signal buffers. For example, one of the reference grounds has a first amount of ground noise, the other of the reference grounds has a second amount of ground noise that is greater than or less than the first amount, and the intermediated grounds are generated to have respective amounts of ground noise that are between the first and second amounts. The ground intermediating buffer can perform signal buffering with respect to the intermediated ground(s), thereby reducing ground noise coupling across the circuit domains through both the signal and ground paths of the buffer stage.