Transimpedance Converter Bias Shifting with Low-Voltage Subtractor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current current-to-voltage signal converters often require high-voltage components to adjust output voltage ranges, which can impact accuracy and increase system cost due to the need for larger, less efficient high-voltage devices.
Innovation Solution
A current-to-voltage signal converter with a trans-impedance amplifier and an analog subtractor circuit, where a voltage adjustment mechanism adjusts the input voltage between predetermined thresholds, allowing for the use of low-voltage components and improving system performance and cost by reducing component size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high-voltage components are used to adjust output voltage ranges, then voltage adjustment capability is improved, but component size and power consumption increase
Solution Approach 1:
The voltage adjustment function is segmented into two independent circuits: a first voltage adjustment circuit that adjusts the positive supply voltage, and a second voltage adjustment circuit that adjusts the negative supply voltage. This segmentation allows each circuit to operate independently at optimized voltage levels, enabling high-voltage output adjustment capability while using low-voltage components that consume less power.
Solution Approach 2:
The patent changes the voltage parameter of the adjustment circuits by using separate positive and negative voltage adjustment circuits with different voltage levels. The first voltage adjustment circuit operates at a first voltage level for the positive supply, while the second voltage adjustment circuit operates at a second voltage level for the negative supply, allowing optimal power efficiency at each level while maintaining overall high-voltage adjustment capability.
2Adaptability or versatility
If high-voltage components are used to adjust output voltage ranges, then voltage adjustment capability is improved, but system cost increases
Solution Approach 1:
The system is segmented into multiple independent voltage adjustment circuits operating at different voltage levels. This allows the use of lower-voltage (and thus lower-cost) components in each circuit rather than requiring expensive high-voltage components throughout the entire system, reducing overall manufacturing cost while maintaining voltage adjustment capability.
Solution Approach 2:
By changing the voltage operating parameters of different adjustment circuits to match the actual requirements of each stage, the patent enables the use of cost-optimized components rated for appropriate voltage levels rather than over-specifying all components for high voltage, thereby reducing system cost.
3Ease of operation
If voltage reference is directly adjusted to bias output current signal, then bias adjustment is simplified, but accuracy of optical signal representation deteriorates
Solution Approach 1:
Instead of directly adjusting the voltage reference that biases the photodiode, the patent introduces intermediary voltage adjustment circuits that modify the supply voltages to the transimpedance amplifier and downstream circuits. This indirect adjustment method maintains the stability of the optical signal representation while still enabling bias adjustment through the intermediary voltage control stages.
Data Source
AI summary
The present disclosure provides a current-to-voltage signal converter which may operate at an adjusted voltage. The current-to-voltage converter includes a trans-impedance amplifier which converts a current input into a voltage output. The voltage output may operate around an undesirable predetermined voltage, and must therefore be adjusted in order to make it suitable for any downstream signal processing circuitry, such as an ADC. As such, a subtractor circuit is coupled to the output of the trans-impedance amplifier. At the input of the subtractor circuit, a voltage adjustment circuit is employed, to adjust the voltage input to the subtractor circuit. As such, the input to the subtractor is adjusted between a first predetermined voltage threshold and a second predetermined voltage threshold, and the subtractor circuit may therefore be a low-voltage component.