Digital Feed Forward Noise Cancelling Regulator Circuit
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Solution Overview
Problem
Voltage-mode drivers in data communication devices are sensitive to noise on the power supply, leading to voltage fluctuations and jitter due to current spikes, which existing solutions fail to address effectively without incurring high power or area overhead.
Innovation Solution
A driver circuit that adapts output current based on detected data patterns by switching in or out dynamic output slices, stabilizing the output voltage and reducing noise with minimal power or area overhead, using a pattern detection circuit to regulate current and voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If voltage-mode drivers are used to reduce power consumption, then power efficiency is improved, but sensitivity to power supply noise increases causing voltage fluctuations and jitter
Solution Approach 1:
The regulator circuit performs preliminary action by proactively detecting data patterns (such as consecutive identical digits) and pre-adjusting the output current before voltage fluctuations occur. This anticipatory current regulation prevents power supply noise and jitter before they affect the transmitter output, resolving the contradiction between low power consumption and signal stability.
2Reliability
If high performance regulators are used to respond quickly to current changes, then voltage stability is improved, but device complexity and power overhead increase
Solution Approach 1:
The regulator circuit applies local quality by focusing its high-performance regulation capabilities only on specific data patterns that cause problematic current spikes (such as consecutive identical digits). For other data patterns, the regulator operates in a lower-performance mode. This selective approach maintains voltage stability when needed while reducing overall device complexity and power overhead.
Solution Approach 2:
The regulator dynamically changes its operating parameters based on the detected data pattern. When consecutive identical digits are detected, the regulator adjusts its output current with higher precision and faster response. For other patterns, it uses standard regulation. This parameter adaptation resolves the contradiction by providing high voltage stability only when necessary, thereby reducing overall complexity.
3Reliability
If output current is increased to maintain stable output voltage during current spikes, then voltage fluctuation is reduced, but power consumption increases
Solution Approach 1:
The regulator applies partial action by increasing the output current only to the extent necessary to compensate for current spikes caused by specific data patterns. Rather than continuously maintaining excessive current to ensure stability, the regulator dynamically adjusts the current level based on the actual demand and detected patterns, thereby reducing unnecessary power consumption while maintaining voltage stability when needed.
Data Source
AI summary
An apparatus comprising a circuit configured to determine whether a data sequence comprises a pre-defined data pattern, regulate an output current based on the pre-defined data pattern, and feed the output current to a transmitter configured to transmit a bitstream comprising the data sequence. Also an apparatus for data transmission comprising a transmitter configured to transmit a bitstream comprising a number of consecutive identical digits (CIDs), and a driver coupled to the transmitter and configured to regulate an output current based on the CIDs to stabilize an output voltage, and feed the output current and output voltage to the transmitter.