Voltage Regulator Circuitry with Dual Reference Voltage Sources
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Solution Overview
Problem
Conventional voltage regulator circuits face a trade-off between low consumption current and noise reduction, as well as power supply rejection ratio (PSRR) improvement, which is challenging to achieve simultaneously, especially in portable electronic devices where noise suppression and PSRR are critical.
Innovation Solution
The proposed voltage regulator circuit employs a dual-reference voltage source system with a low consumption current source and a low noise source, switching between them based on load conditions, using MOSFET transistors and resistors to control output voltage and noise levels, while maintaining low consumption current when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a linear regulator is used to reduce noise and improve PSRR, then noise reduction and PSRR characteristic improve, but consumption current increases
Solution Approach 1:
The patent applies dynamics by switching between two reference voltage sources based on operational conditions. A first reference voltage source is used during normal operation, and a second reference voltage source with lower noise characteristics is activated when high precision is required. This dynamic switching allows the system to optimize between consumption current and noise performance based on real-time needs.
Solution Approach 2:
The patent changes the parameter of reference voltage noise characteristics by selecting different reference voltage sources. The first reference voltage source provides adequate performance for general operation, while the second reference voltage source provides enhanced noise reduction when required. This parameter change enables the system to achieve low noise performance only when necessary, thereby reducing overall consumption current.
2Reliability
If a linear regulator is used to improve PSRR characteristic, then PSRR improves, but consumption current increases
Solution Approach 1:
The system dynamically switches between reference voltage sources based on PSRR requirements. During normal operation, the first reference voltage source is used to maintain lower consumption current. When high PSRR performance is required, the system switches to the second reference voltage source, achieving improved power supply rejection ratio only when necessary.
Solution Approach 2:
The patent changes the PSRR performance parameter by selecting different reference voltage sources. The second reference voltage source provides superior PSRR characteristics compared to the first reference voltage source. By changing this parameter selectively based on operational requirements, the system achieves high reliability when needed while maintaining energy efficiency during normal operation.
3Object-affected harmful factors
If noise reduction measures are implemented in the reference voltage source, then noise decreases, but circuit complexity increases
Solution Approach 1:
The patent segments the reference voltage source into two distinct sources: a first reference voltage source for general operation and a second reference voltage source for high-precision applications. Each source is independently designed with appropriate noise characteristics. This segmentation allows the system to achieve low noise performance when required without permanently increasing circuit complexity, as the second source is only activated when needed.
Solution Approach 2:
The switching mechanism provides multi-functionality by enabling the system to operate in two different modes: normal operation mode using the first reference voltage source and high-precision mode using the second reference voltage source. This universal switching architecture allows a single circuit to adapt to different performance requirements, achieving low noise performance when needed while maintaining simplicity during normal operation.
Data Source
AI summary
Voltage regulator circuitry includes a first element, a second element, an amplifier and a reference voltage source. The first element converts an input voltage and outputs a predetermined output voltage. The second element outputs a current in proportion to a current based on the outputted voltage from the first element. The amplifier amplifies a differential voltage between a reference voltage and a voltage in proportion to the output voltage, the amplifier which controls the first element based on the differential voltage. The reference voltage source outputs the reference voltage which adapts to a comparison between the current outputted from the second element and a reference current.