Switch Control Unit With Shared Contact Pad For Optical Sensing
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Solution Overview
Problem
Conventional optical fiber control systems face challenges in flexibly adjusting pin numbers between sensing and driving purposes, leading to limitations in frequency sensing capability and increased startup time due to fixed pin configurations and voltage leveling delays.
Innovation Solution
A switch control unit with a common contact pad shared between sensing and drive units, incorporating a digital-to-analog converter, an analog-to-digital converter, and a loop switching unit that allows for flexible pin arrangement and rapid voltage leveling by charging a voltage leveling capacitor, enabling shorter startup times and increased frequency sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed pin configuration is used for ADC and DAC, then the chip design is simple, but the flexibility to adjust pin numbers between sensing and driving purposes is limited
Solution Approach 1:
The patent implements a universal contact pad design where each contact pad can serve multiple functions (sensing, driving, or both) depending on the configuration. The shared contact pad between ADC and DAC allows the same physical pin to be assigned to different functions based on system requirements, enabling flexible adjustment of pin numbers without increasing the total number of physical pins on the chip.
Solution Approach 2:
The patent introduces dynamic configuration capabilities where the pin assignments and functional allocations can be changed based on operational requirements. The system allows dynamic adjustment of which pins are assigned to ADC, which to DAC, and which to shared functions, enabling adaptability without requiring fixed, rigid pin configurations throughout the chip design.
2Reliability
If voltage leveling capacitor is used to reduce noise in sensing circuit, then the noise reduction is improved, but the startup time increases due to delay in charging the capacitor
Solution Approach 1:
The patent implements preliminary charging of the voltage leveling capacitor during the initialization sequence before actual sensing operations begin. The system proactively charges the capacitor in advance, ensuring that when sensing starts, the capacitor is already at the required voltage level, thereby eliminating the startup delay while maintaining the noise reduction benefits of the capacitor.
Solution Approach 2:
The patent ensures continuous operation by maintaining the voltage leveling capacitor charge during transitions between different operational modes. The system keeps the capacitor charged either during sensing operations or during driving operations, eliminating idle charging periods and ensuring that the capacitor is always ready for the next operation, thus eliminating startup delays while maintaining continuous useful action.
3Adaptability or versatility
If the total pin number is increased to satisfy diverse sensing and driving requirements, then the functional capability is improved, but the planar area of the chip increases
Solution Approach 1:
The patent merges the pin requirements for ADC and DAC by implementing shared contact pads that can serve both functions. Instead of having separate dedicated pins for each function, the system combines them into shared resources, reducing the total number of pins required while maintaining the functional capability to perform both sensing and driving operations with diverse requirements.
Solution Approach 2:
The patent implements a universal contact pad design where each contact pad can serve multiple functions (sensing, driving, or both) depending on the configuration. The shared contact pad between ADC and DAC allows the same physical pin to be assigned to different functions based on system requirements, enabling flexible adjustment of pin numbers without increasing the total number of physical pins on the chip.
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 allows for flexible pin arrangement and significantly reduces startup time, enhancing the frequency sensing capability and communication speed in optical fiber signal systems by efficiently managing voltage levels across contact pads.
Implementation Method 1
a voltage leveling capacitor (voltage regulating capacitor) C is often required to reduce noise
Implementation Method 2
when a photoelectric diode 16 is used in the sensing circuit to sense light intensity
Data Source
AI summary
A switch control unit and optical control unit, including: a digital-to-analog converter, being switchable between being coupled to a first sensing unit and being coupled to a drive unit, through a common contact pad; a sensing contact pad, coupled to a second sensing unit; an analog-to-digital converter, for sensing voltages at the contact pads when coupled to the sensing units, wherein each of the sensing units has a minimum working voltage level; and a loop switching unit, coupled between the common contact pad, the analog-to-digital converter, and the sensing contact pad, wherein when the voltage at the common contact pad is substantially higher than the minimum working voltage level, the loop switching unit conducts the common contact pad to the analog-to-digital converter to sense the voltage at the common contact pad, and the digital-to-analog converter enters a high-impedance state such that the digital-to-analog converter does not sense the voltage at the common contact pad.