Dual Reference Voltage Circuit for Low Power Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing reference voltage generators face challenges in achieving high accuracy while minimizing power consumption, particularly in applications where current consumption is critical.
Innovation Solution
A circuit combining a bandgap voltage reference generator with a digital controlled low power voltage buffer, where the second reference voltage generating circuit stores a value representative of the first reference voltage to maintain voltage generation when the first circuit is switched off, reducing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bandgap voltage reference generator is used to provide high accuracy reference voltage, then the accuracy of the reference voltage is improved, but the current consumption increases
Solution Approach 1:
The reference voltage generation system is divided into two independent circuits: a first reference voltage generating circuit (bandgap) for high accuracy and a second reference voltage generating circuit (low-power) for low current consumption. Each circuit operates independently and can be selectively activated based on system requirements, allowing the system to achieve high accuracy when needed while minimizing power consumption during normal operation.
Solution Approach 2:
The system changes the operational parameters by switching between two different reference voltage generation modes. The first circuit operates when high accuracy is required, while the second circuit operates when low power consumption is prioritized. This parameter change allows the system to adapt between accuracy and power consumption requirements dynamically.
2Stability of the object's composition
If a single reference voltage generator is used to maintain continuous operation, then the voltage stability is maintained, but the power consumption cannot be reduced
Solution Approach 1:
The second reference voltage generating circuit is pre-configured with circuit elements (such as resistors and transistors in specific configurations) that enable it to generate a stable reference voltage without requiring continuous operation of the high-power first circuit. The preliminary design of the second circuit allows it to take over reference voltage generation duties, reducing power consumption while maintaining voltage stability.
Data Source
AI summary
According one embodiment, a circuit is described comprising a first reference voltage generating circuit comprising an output to provide a first reference voltage and a second reference voltage generating circuit comprising an input receiving a value representative of the first reference voltage, the second reference voltage generating circuit being configured to generate a second reference voltage based on the received value.