Voltage Reference Circuit for Low-Power Noise-Stable Supply
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Solution Overview
Problem
Existing power supply systems face challenges in achieving low power consumption while maintaining high noise immunity and performance, particularly in low-power modes where reducing power consumption compromises anti-noise abilities and transient response.
Innovation Solution
A voltage reference source circuit with a starting circuit, current generating circuit, and output voltage reference circuit is designed to provide a zero temperature coefficient reference voltage, utilizing a specific configuration of PMOS and NMOS tubes to ensure high noise immunity and stability, connected to a voltage regulator circuit for amplification and power supply output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the current of bandgap core is reduced to meet low power consumption requirements, then power consumption decreases, but anti-noise ability deteriorates and voltage oscillation occurs
Solution Approach 1:
The voltage reference circuit is divided into two independent modes: a low-power mode using a simplified circuit structure with reduced current consumption, and a high-performance mode using the complete bandgap structure with full current. The system can switch between these segmented configurations based on operational requirements, allowing low power consumption during idle periods while maintaining full anti-noise capability when needed.
Solution Approach 2:
The circuit employs dynamic current control where the bandgap core current can be adjusted between different levels. A control circuit dynamically switches the current magnitude based on operational mode, enabling the circuit to adapt its power consumption and performance characteristics in real-time, thus achieving low power consumption without permanently compromising anti-noise ability.
2Use of energy by stationary object
If devices are designed to work in saturation region to reduce power consumption in low-power mode, then power consumption decreases, but layout area increases due to larger device sizes
Solution Approach 1:
Different regions of the circuit are assigned different operational characteristics. The low-power mode utilizes sub-threshold region operation for minimal power consumption with compact devices, while the high-performance mode employs saturation region operation with optimized device sizes. This local differentiation allows the same circuit to achieve both low power consumption and reasonable layout area by adapting device operating points to local requirements.
3Duration of action of stationary object
If power consumption is reduced in low-power mode applications, then battery life increases, but transient response ability and anti-noise ability are lost
Solution Approach 1:
The system implements periodic switching between low-power mode and high-performance mode based on operational demands. During extended idle periods, the circuit operates in low-power mode to maximize battery life. When transient events or noise susceptibility becomes a concern, the system periodically activates the high-performance mode to restore transient response ability and anti-noise characteristics, thus achieving long battery life without permanently sacrificing reliability.
Data Source
AI summary
The present disclosure provides a voltage reference source circuit for generating a reference voltage, the voltage reference source circuit comprises a starting circuit, a current generating circuit, and an output voltage reference circuit electrically connected in sequence. The starting circuit provides a starting voltage for the voltage reference source circuit to prevent the voltage reference source circuit from operating in zero state area. The current generating circuit generates a working current for the output voltage reference circuit; and the output voltage reference circuit is used to realize the reference voltage output with zero temperature coefficient according to the working current output by the current generating circuit. A low power consumption power supply system is also disclosed. The voltage reference source circuit and the low power consumption power supply system with the voltage reference source circuit have simple circuit structure, strong anti-noise ability, high stability and high performance.