Voltage Reference Circuit With Temperature Drift Correction
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Solution Overview
Problem
Existing voltage reference circuits face challenges in achieving high precision and low noise while maintaining low power consumption, especially in applications requiring stability over a range of temperatures and process variations.
Innovation Solution
A high precision voltage reference circuit is designed, incorporating a current mirror circuit, multiple stages of transistors, and a power source that generates correction voltages to cancel temperature drifts, allowing for precise output voltage generation with minimal noise and low quiescent current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature drift correction is implemented in a voltage reference circuit, then measurement precision and stability over temperature range are improved, but device complexity increases due to additional correction circuits and components
Solution Approach 1:
The patent converts the harmful temperature drift effect into a beneficial correction mechanism by generating a temperature-dependent voltage that compensates for the drift. The correction circuit uses the same temperature variations that cause errors to create an opposing correction signal, thereby improving measurement precision without requiring external compensation.
Solution Approach 2:
The voltage reference circuit employs feedback mechanisms where the output voltage is monitored and used to adjust the correction voltage dynamically. This feedback loop ensures that temperature drift is continuously compensated, maintaining high measurement precision across varying temperature conditions while automating the correction process.
2Measurement precision
If high precision voltage reference is achieved through multiple correction stages, then measurement precision is improved, but power consumption increases due to additional active components
Solution Approach 1:
The patent implements dynamic power management in the correction circuits, where the correction stages are activated only when temperature drift compensation is required. The circuit dynamically adjusts the operation of correction components based on temperature conditions, enabling high precision voltage reference while reducing average power consumption during stable temperature operation.
Solution Approach 2:
The correction circuits utilize parameter changes in transistor operating points and resistance values to achieve temperature compensation. By changing the operational parameters of existing components rather than adding continuously active correction elements, the circuit achieves improved voltage reference accuracy with minimal increase in quiescent current.
3Measurement precision
If low noise performance is achieved in voltage reference circuit, then measurement precision is improved, but device complexity increases due to noise filtering and shielding requirements
Solution Approach 1:
The patent introduces intermediary buffering stages and isolated reference nodes that act as mediators between the voltage generation circuit and the output. These intermediaries provide galvanic isolation and impedance matching, reducing noise coupling and improving noise performance without requiring extensive external filtering or shielding infrastructure.
Solution Approach 2:
The circuit replaces mechanical or external noise filtering mechanisms with electronic noise reduction techniques implemented directly in the voltage reference circuitry. By using electronic compensation and active noise cancellation within the circuit itself, the patent achieves low noise performance while avoiding the complexity of external filtering hardware.
Data Source
AI summary
In described examples, a circuit includes a current mirror circuit. A first stage is coupled to the current mirror circuit. A second stage is coupled to the current mirror circuit and to the first stage. An output transistor is coupled to the first stage and to the current mirror circuit. A voltage divider network is coupled to the output transistor, and a power source is coupled to the second stage and to the voltage divider network.