Feedback-Loop ADC for Optical Wobble Signal Digitization
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Solution Overview
Problem
Current optical data storage systems require numerous analog-to-digital converters to digitize multiple wobble signals, leading to high costs, space utilization, and power consumption due to the excessive number of components and inputs/outputs.
Innovation Solution
A mixed signal analog-to-digital converter with a feedback loop that includes a comparator, sampling component, and integrators to digitize optical wobble signals, where the sampling frequency is at least 50 times greater than the wobble signal frequency, allowing for low-cost and low-component digitization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple analog-to-digital converters are used to digitize multiple wobble signals from multiple recording zones, then accurate signal digitization is achieved, but cost, space utilization, power consumption, and component count increase significantly
Solution Approach 1:
The patent combines multiple wobble signal processing functions into a single analog-to-digital converter. The multiplexer selectively switches between multiple wobble signals from different recording zones, allowing one ADC to sequentially process multiple signals that would traditionally require separate converters for each zone, thereby reducing component count while maintaining digitization accuracy
Solution Approach 2:
The single ADC is designed to handle multiple functions by processing wobble signals from multiple recording zones through time-division multiplexing. The converter serves as a universal digitization device that can adapt to different input signals from various zones, eliminating the need for dedicated ADCs for each recording zone
2Reliability
If multiple analog-to-digital converters are deployed for multiple recording zones, then complete wobble signal coverage is achieved, but power consumption and cost increase excessively
Solution Approach 1:
Multiple signal processing functions are merged into a single ADC with multiplexer control. The system achieves complete coverage of all recording zones by sequentially switching between zones rather than simultaneously processing all signals with multiple converters, dramatically reducing power consumption while maintaining reliable detection across all zones
Solution Approach 2:
The multiplexer implements periodic switching between different recording zone signals, allowing the single ADC to cycle through and digitize wobble signals from multiple zones in sequence. This time-division approach ensures complete signal coverage across all zones while the ADC remains active only when needed, minimizing overall power consumption compared to having multiple continuously operating converters
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a cost-effective and efficient method for digitizing wobble signals, reducing the need for multiple converters and minimizing power consumption while maintaining accurate signal representation.
Implementation Method 1
a comparator that receives the wobble signal through a first resistive component at a first comparator input and outputs a first output signal having either a high output or a low output
Implementation Method 2
a sampling component that samples the first output signal at a sampling frequency and outputs a second output signal. The sampling frequency is at least 50 times greater than the wobble signal frequency
Implementation Method 3
a first integrator component that receives the second output signal and outputs a third output signal. The third output signal is provided to the first comparator input through a second resistive component such that the third output signal tracks the wobble signal due to feedback action in the feedback loop
Data Source
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AI summary
An analog-to-digital converter includes a feedback loop that receives a wobble signal having a wobble signal frequency. The feedback loop includes a comparator that receives the wobble signal through a first resistive component at a first comparator input and outputs a first output signal having either a high output or a low output. The feedback loop also includes a sampling component that samples the first output signal at a sampling frequency and outputs a second output signal and a first integrator component that receives the second output signal and outputs a third output signal. The third output signal tracks the wobble signal due to feedback action in the feedback loop. Finally, the analog-to-digital converter further includes a final discrete integrator component that integrates the second output signal to provide a digital representation of the wobble signal.