Power Voltage Generator Reference Scaling Against Ground-Noise Flicker
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Solution Overview
Problem
Display devices face issues with noise generation in driving voltages due to ground noise, leading to flicker in components connected to the power voltage generator.
Innovation Solution
A power voltage generator is designed to generate an analog reference voltage based on an input voltage, using a resistance string for voltage distribution, a decoding unit to generate reference voltages, and a regulator unit to produce driving voltages, thereby reducing the influence of noise on regulator outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ground noise is present in the power voltage generator, then noise is generated in the driving voltages, but increasing voltage levels of reference voltages can reduce voltage gains and minimize noise impact
Solution Approach 1:
The patent changes the voltage level parameter of the reference voltage from a low level to a high level. By increasing the reference voltage level, the voltage gain of the regulator is reduced, which minimizes the amplification of ground noise and improves the noise characteristics of the driving voltages
Solution Approach 2:
The patent converts the harmful effect of ground noise into a benefit by using high-level reference voltages. The increased reference voltage level reduces the voltage gain, which in turn minimizes the impact of ground noise on the driving voltages, effectively converting the noise problem into a design advantage
2Adaptability or versatility
If analog reference voltage is generated based on input voltage, then driving voltages can be generated for other components, but noise may be transmitted to components receiving driving voltages
Solution Approach 1:
The patent changes the voltage level parameter of the reference voltage to a high level. This parameter change reduces the voltage gain of the regulator, which minimizes the transmission of noise to components receiving driving voltages while maintaining the ability to generate multiple driving voltages
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 proposed solution increases the voltage levels of reference voltages applied to regulators, reducing voltage gains and minimizing the impact of noise on regulator outputs, thereby improving noise characteristics.
Implementation Method 1
a first bandgap reference voltage generator configured to receive the first input voltage to generate a first bandgap reference voltage
Implementation Method 2
a first amplifier including a first input terminal configured to receive the first bandgap reference voltage, a second input terminal connected to a first node, and an output terminal configured to output a preliminary analog reference voltage
Implementation Method 3
a second bandgap reference voltage generator configured to receive the preliminary analog reference voltage to generate a second bandgap reference voltage
Implementation Method 4
a second amplifier including a first input terminal configured to receive the second bandgap reference voltage, a second input terminal connected to a second node, and an output terminal configured to output the analog reference voltage
Implementation Method 5
a resistance string configured to generate distribution voltages by performing voltage distribution on the analog reference voltage
Data Source
AI summary
A power voltage generator includes an analog reference voltage generator configured to generate an analog reference voltage based on a first input voltage, a resistance string configured to generate distribution voltages by performing voltage distribution on the analog reference voltage, a decoding unit configured to generate reference voltages by decoding the distribution voltages, and a regulator unit configured to generate driving voltages based on the reference voltages.