Conditional Gain Correction for Low-Latency Feedback Loops
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Solution Overview
Problem
The increasing feedback latency in data processing systems due to shorter bit periods leads to loop instability, as the feedback signal is applied after the condition it intended to correct has resolved, potentially causing positive feedback and operational instability.
Innovation Solution
A data processing system with a conditional multiplication circuit that applies a gain correction signal to the amplified signal before the delay period expires, using a master and slave loop configuration to reduce latency and stabilize the feedback loop, allowing for immediate gain adjustments based on error calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data processing speed is increased to handle shorter bit periods, then productivity is improved, but feedback latency increases causing loop instability
Solution Approach 1:
The patent applies preliminary action by calculating the gain correction signal in advance based on the error signal, before the amplified signal actually experiences the gain change. The conditional multiplication circuit pre-computes what the gain-corrected signal would be, allowing the feedback loop to use this pre-calculated value immediately without waiting for the physical gain adjustment to propagate through the amplifier. This resolves the contradiction by making the feedback response appear instantaneous despite the physical latency in the amplification process.
Solution Approach 2:
The patent introduces an intermediary element - the conditional multiplication circuit - that mediates between the error signal and the amplified signal. Instead of directly feeding back the raw error signal after the amplifier latency, the system uses this intermediary circuit to compute a corrected version of the amplified signal using the gain correction signal. This intermediary computation allows the feedback loop to bypass the physical latency of the amplifier by mathematically compensating for it in real-time.
2Stability of the object's composition
If feedback latency is reduced to maintain loop stability, then loop stability is improved, but data processing speed must be reduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gain correction signal based on the error signal and conditional multiplication of the amplified signal. By changing the gain parameter in real-time through this correction mechanism, the system maintains loop stability even at high data processing speeds. The conditional multiplication allows the gain parameter to be adjusted independently of the physical amplifier latency, effectively decoupling stability requirements from processing speed limitations.
3Device complexity
If gain correction is applied after delay period expires, then device complexity is reduced, but loop stability deteriorates due to positive feedback
Solution Approach 1:
The patent applies preliminary action by computing the gain correction signal and applying it through conditional multiplication before the delay period expires. The conditional multiplication circuit calculates what the corrected signal would be using the current gain correction signal, making the correction available immediately rather than waiting for the delayed feedback to return. This prevents the feedback from becoming positive and destabilizing the loop, while avoiding the need for complex additional compensation circuits.
Data Source
AI summary
Various embodiments of the present invention provide systems and methods for reduced latency feedback in a data processing system. For example, some embodiments provide a data processing system that includes a variable gain amplifier, a processing circuit, a data detector, and an error signal calculation circuit. The variable gain amplifier amplifies a data input signal and provides an amplified signal. The processing circuit generates a signal output corresponding to the amplified signal, and includes a conditional multiplication circuit. The conditional multiplication circuit conditionally multiplies the signal output by a gain correction signal and provides the result as an interim output. The data detector applies a data detection algorithm to the signal output and provides an ideal output. The error signal calculation circuit generates a gain correction signal based at least in part on the interim output and a derivative of the ideal output. The level of amplification by the variable gain amplifier is based at least in part on the gain correction signal.