Differential Receiving Circuit for LVDS Offset and Noise Suppression
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Solution Overview
Problem
Higher definition display devices require faster image signal transmission, which can lead to noise interference and degradation due to variations in transistor characteristics in receiver circuits, particularly in low-voltage differential signaling (LVDS) systems, causing incorrect signal reception and reduced display quality.
Innovation Solution
A receiving circuit structure that converts differential signals into single-ended signals using operational amplifiers, transistors, and capacitors to stabilize signal transmission, reducing variations and offset components, and employing transistors with low off-state current and metal oxide semiconductor layers to minimize noise and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If image signals are transmitted at high speed to support higher definition display, then display quality and definition are improved, but electromagnetic interference and noise increase causing signal degradation
Solution Approach 1:
The patent introduces a receiving circuit as an intermediary component between the transmission line and the display device. This receiving circuit includes differential input terminals, an operational amplifier, and single-ended output terminals that convert differential signals to single-ended signals. The receiving circuit acts as a buffer and signal conditioner that isolates the display device from electromagnetic interference while maintaining high-speed signal transmission capability.
Solution Approach 2:
The patent changes the signal transmission mode from single-ended to differential signaling in the transmission line, and then converts it back to single-ended at the receiving end. This parameter change in signal mode allows high-speed transmission with noise immunity during transit, then adapts the signal to the display device's requirements at the destination.
2Manufacturing precision
If the number of pixels is increased for higher definition, then display quality is improved, but the amount of transmitted image signals increases requiring faster transmission
Solution Approach 1:
The receiving circuit serves as an intermediary that efficiently handles the increased signal volume from high-definition displays. By providing dedicated differential input terminals and single-ended output terminals with operational amplifier-based conversion, the receiving circuit enables the display device to process larger amounts of pixel data at higher rates without signal degradation.
3Reliability
If differential signaling is used to reduce noise and power consumption, then signal integrity is improved, but variations in transistor characteristics still cause differential amplitude variations leading to incorrect signal reception
Solution Approach 1:
The operational amplifier in the receiving circuit acts as an intermediary that compensates for transistor variations. The op-amp's high gain and precision characteristics allow it to accurately amplify the differential signal despite variations in the input transistors, converting it to a precise single-ended output that maintains signal integrity.
Solution Approach 2:
The receiving circuit is designed with self-compensation capabilities where the operational amplifier automatically adjusts for transistor characteristic variations through its inherent feedback mechanisms, ensuring accurate differential amplitude measurement without external calibration.
Data Source
AI summary
Variations in a receiving circuit employing differential signaling are reduced. The receiving circuit converts a first signal and a second signal which are supplied through differential signaling into a third signal which is a single-ended signal and outputs the third signal. The receiving circuit includes an operational amplifier, a first element, a first transistor, and a first circuit. The first element is connected to the first circuit through a first node to which the first transistor is connected. The first signal and the second signal that is the inverse of the first signal are supplied to the operational amplifier. The operational amplifier supplies an output signal to the first element, and a first preset potential is supplied to the first node through the first transistor. A signal including variations of the operational amplifier is stored in the first element in accordance with the first preset potential. The first circuit that is supplied with the first preset potential determines an initial value of the third signal without being influenced by the signal including variations of the operational amplifier.