Multiplexed Integrating Amplifier for Low-Power LOS Detection
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Solution Overview
Problem
Existing loss of signal (LOS) circuits in semiconductor devices require significant space and electrical current due to the need for two identical amplifiers to compare the main data signal with a reference signal without interrupting the data stream, leading to increased circuit footprint and reduced performance.
Innovation Solution
A multiplexed integrating amplifier (MIALOS) system that time-multiplexes the use of a single amplifier between the data signal and a reference signal, allowing for parallel operation with the main data path and reducing the overall circuit size and current draw by eliminating the need for a second identical amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two identical amplifiers are used to compare the main data signal with a reference signal without interrupting the data stream, then loss of signal detection accuracy is improved, but circuit footprint and current draw increase significantly
Solution Approach 1:
The patent combines the functions of two separate amplifiers into a single amplifier by time-multiplexing the reference signal and data signal through a multiplexer. The single amplifier alternates between amplifying the reference signal and the data signal, eliminating the need for two identical amplifiers while maintaining detection accuracy through periodic comparison.
Solution Approach 2:
The single amplifier is designed to perform multiple functions by processing both the reference signal and the data signal at different time intervals. This multi-functional approach allows the amplifier to serve both as a reference signal amplifier and a data signal amplifier, reducing the overall component count and circuit footprint.
2Reliability
If two identical amplifiers are used to compare the main data signal with a reference signal, then loss of signal detection reliability is improved, but electrical current consumption increases dramatically
Solution Approach 1:
The patent merges the current consumption of two amplifiers into a single amplifier by time-sharing its operation. The amplifier processes the reference signal during one time interval and the data signal during another, reducing the total current draw while maintaining the reliability needed for accurate loss of signal detection through periodic signal comparison.
Solution Approach 2:
The system employs periodic action by alternating between amplifying the reference signal and the data signal in time intervals. This periodic switching, controlled by the multiplexer, allows the single amplifier to maintain reliable detection capabilities while consuming less current than two continuously operating amplifiers would require.
3Productivity
If a second identical amplifier is provided for LOS comparison, then data stream continuity is maintained, but device complexity increases
Solution Approach 1:
The patent merges the functionality of two amplifiers into one by using a multiplexer to time-share the single amplifier between reference signal processing and data signal processing. This reduces the number of amplifiers from two to one, simplifying the device while maintaining data stream continuity through non-intrusive monitoring.
Solution Approach 2:
The multiplexer acts as an intermediary that directs the reference signal and data signal to the single amplifier at appropriate time intervals. This intermediary component enables the single amplifier to handle multiple signal types without requiring two separate amplifiers, thereby reducing device complexity while preserving continuous data stream processing.
Data Source
Figure 1A~2A
Figure 2B
Figure 2C
AI summary
A loss of signal circuit has a multiplexer and a photodiode coupled to a first input of the multiplexer. A reference signal generator is coupled to a second input of the multiplexer. An amplifier is coupled to an output of the multiplexer. A demultiplexer includes an input of the demultiplexer coupled to an output of the amplifier. A first capacitor is coupled to a first output of the demultiplexer. A second capacitor is coupled to a second output of the demultiplexer. A comparator has a first input coupled to the first output of the demultiplexer and a second input of the comparator is coupled to the second output of the demultiplexer.