Differential Signal Receiver for High Common-Mode LVDS Inputs
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Solution Overview
Problem
Conventional signal receivers for low voltage differential signals (LVDS) face challenges in processing input signals with higher common-mode voltages, leading to signal distortion and increased power consumption due to the need for larger circuit sizes and level shift circuits.
Innovation Solution
A signal receiver design featuring transistors with high voltage endurance operating in common drain configuration, coupled with a load circuit that adjusts common-mode voltage and an amplifying circuit generating output signals between power and ground voltages, allowing for efficient processing of differential signals with wide common-mode voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the power voltage is reduced to save power consumption, then power consumption is reduced, but signal distortion occurs when input signals have higher common-mode voltage
Solution Approach 1:
The patent changes the voltage parameter characteristics by using transistors with high voltage endurance that can tolerate input common-mode voltages higher than the power voltage. This allows the signal receiver to process LVDS signals with common-mode voltages up to 1.8V while operating with lower power voltages, eliminating signal distortion without requiring additional level shift circuits.
2Reliability
If a level shift circuit is added to adjust common-mode voltage, then signal distortion is prevented, but circuit size increases
Solution Approach 1:
The patent extracts and eliminates the unnecessary level shift circuit from the signal receiver by using transistors with high voltage endurance. These transistors can directly handle input signals with common-mode voltages higher than the power voltage, removing the need for separate voltage adjustment circuits and reducing overall circuit size.
Solution Approach 2:
The transistors with high voltage endurance serve multiple functions: they act as both the signal processing elements and the voltage tolerance elements. This multi-functionality eliminates the need for separate level shift circuits, reducing circuit complexity and size while maintaining signal processing quality.
3Reliability
If a level shift circuit is added to adjust common-mode voltage, then signal distortion is prevented, but power consumption increases
Solution Approach 1:
The patent removes the power-consuming level shift circuit by using transistors with high voltage endurance that can directly process signals with higher common-mode voltages. This extraction eliminates the additional power consumption that would be required to operate separate voltage adjustment circuits.
Data Source
AI summary
A signal receiver includes a first transistor, a second transistor, a load circuit, an amplifying circuit and a load circuit. The first transistor has a first end receiving a power voltage, and a control end receive a first input signal. The second transistor has a first end receiving the power voltage, and a control end receiving a second input signal, wherein the first input signal and the second input signal are differential signals and transit between a first voltage and a reference ground voltage, the first voltage is larger than the power voltage. The load circuit is coupled to the first transistor and the second transistor. The amplifying circuit generates an output signal according a first signal on the second end of the first transistor and a second signal on the second end of the second transistor.