Reference Voltage Circuit Temperature Compensation
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Solution Overview
Problem
Conventional reference voltage generating circuits face limitations in improving temperature dependence characteristics due to complex configurations and the need for adjustments across multiple temperature ranges, which restrict the effectiveness of temperature compensation.
Innovation Solution
A reference voltage generating circuit with separate adjusting circuit elements for first-order and second-order temperature coefficients, utilizing a current source to cancel the second-order differential component of the reference voltage, allowing for improved temperature dependence characteristics through a simpler configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple correction current generating circuits are provided to eliminate temperature dependence characteristic, then temperature compensation is improved, but circuit complexity increases
Solution Approach 1:
The patent segments the temperature compensation function into two independent adjusting circuit elements: one for first-order temperature coefficient and another for second-order temperature coefficient. This segmentation allows each element to handle a specific aspect of temperature compensation, improving effectiveness while keeping the overall circuit structure manageable through functional division.
2Reliability
If adjustments are made for multiple temperature ranges to eliminate quadratic temperature dependence, then temperature dependence characteristic is improved, but device complexity increases
Solution Approach 1:
The patent changes the approach from adjusting for multiple temperature ranges to directly adjusting temperature coefficient parameters. By introducing separate adjusting circuit elements that directly modify first-order and second-order temperature coefficients, the circuit achieves temperature compensation across all ranges simultaneously through parameter control rather than range-specific adjustments.
3Reliability
If a current source is used to cancel second-order differential component, then temperature dependence is improved, but circuit complexity may increase
Solution Approach 1:
The patent introduces a current source as an intermediary element that generates a current proportional to the square of the reference voltage. This intermediary current is then used by the second adjusting circuit element to cancel the second-order differential component, effectively removing quadratic temperature dependence without requiring complex direct control mechanisms.
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 solution effectively adjusts both first-order and second-order temperature coefficients, significantly enhancing the stability of the reference voltage across a wide temperature range without increasing circuit complexity.
Implementation Method 1
The first diode characteristic element Q10, such as a diode or a bipolar transistor, and a first resistor R10 are connected in series to each other. The first diode characteristic element Q10 has a diode characteristic (current-voltage characteristic by PN junction).
Data Source
AI summary
A reference voltage generating circuit includes: a reference voltage generating circuit element including a first diode characteristic element and a second diode characteristic element, a density of a current flowing through the second diode characteristic element being different from a density of a current flowing through the first diode characteristic element, the reference voltage generating circuit element being configured to output a reference voltage generated based on a difference between voltages respectively applied to the first diode characteristic element and the second diode characteristic element; a first adjusting circuit element configured to adjust a first-order temperature coefficient of the reference voltage; and a second adjusting circuit element configured to adjust a second-order temperature coefficient of the reference voltage.