LVDS Power Supply Circuit for Stable Startup Signal Voltage
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Solution Overview
Problem
The LVDS driver experiences voltage inconsistencies at startup or after power recovery, leading to higher differential signal High levels than intended, which can exceed receiver voltage ratings and cause failures.
Innovation Solution
A power supply circuit with a common circuit unit and individual circuit units is used to supply a stable power supply voltage to differential transmitters, ensuring that the voltage remains consistent across all transmitters, even during startup or power recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the current path is disconnected for power reduction, then power consumption is reduced, but the High level of the differential signal becomes higher than intended when output is restarted
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitor connected to the non-inverting input terminal of the differential amplifier through a dedicated charging circuit before the differential transmitter outputs data. This ensures that the input terminal is already at the correct voltage level when data transmission begins, preventing the High level signal from exceeding the receiver's voltage rating. The charging circuit activates in advance to prepare the circuit state, resolving the voltage instability issue that occurs after power recovery or current path disconnection.
2Device complexity
If a single power supply circuit is used for multiple differential transmitters, then device complexity is reduced, but voltage inconsistency occurs across transmitters during startup or power recovery
Solution Approach 1:
The patent segments the power supply function by providing each differential transmitter with its own dedicated power supply circuit rather than using a single shared power supply. This segmentation ensures that each transmitter receives a stable and consistent power supply voltage independently, preventing voltage inconsistency issues during startup or power recovery. The segmentation approach maintains voltage stability across all transmitters while managing complexity through modular design.
Data Source
AI summary
The disclosed apparatus includes a plurality of differential transmitters, and a power supply circuit that supplies a power supply voltage to each of the plurality of differential transmitters. The power supply circuit includes a common circuit unit that defines the power supply voltage supplied to the plurality of differential transmitters, and a plurality of individual circuit units provided in association with the plurality of differential transmitters and each connected to the common circuit unit. Each of the plurality of individual circuit units has an output node that outputs the power supply voltage defined by the common circuit unit to a corresponding differential transmitter of the plurality of differential transmitters, and respective output nodes of the plurality of individual circuit units are connected to each other.