Band-gap Reference Voltage Circuit Selecting Temperature Coefficients
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Solution Overview
Problem
Conventional temperature sensor circuits using band-gap reference voltage circuits are limited in their ability to selectively output voltages with arbitrary temperature coefficients, requiring additional circuits for temperature compensation in electrical systems.
Innovation Solution
A temperature sensor circuit design that incorporates a band-gap reference voltage circuit with a transistor-resistor-diode series configuration, allowing for the selection of output voltages with positive, negative, or both positive and negative temperature coefficients, and the ability to set the cross-point of these coefficients by adjusting the resistor value, without the need for complex circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional band-gap reference voltage circuit is used, then the circuit outputs a voltage with a fixed predetermined temperature coefficient, but it cannot selectively output voltages with arbitrary temperature coefficients
Solution Approach 1:
The circuit is divided into separate functional modules: a band-gap reference voltage circuit for generating reference voltages, buffer circuits for isolating and transmitting signals, and a voltage divider circuit for selecting different temperature coefficients. This segmentation allows each module to perform its specific function independently, enabling selective output of voltages with different temperature coefficients while maintaining overall circuit simplicity.
Solution Approach 2:
The band-gap reference voltage circuit is designed to simultaneously provide multiple reference voltages with different temperature coefficients (positive and negative). The voltage divider circuit can selectively tap into these different reference voltages to output the desired temperature coefficient, making the circuit universal for various temperature compensation applications without requiring additional dedicated circuits.
2Adaptability or versatility
If another circuit is prepared for creating output voltage with predetermined temperature coefficient, then arbitrary temperature coefficient selection is enabled, but the device complexity increases
Solution Approach 1:
Multiple functions are merged into a single integrated circuit structure. The band-gap reference voltage circuit, buffer circuits, and voltage divider circuit are combined to work together as one unified system. This merging eliminates the need for separate additional circuits while still providing the capability to select arbitrary temperature coefficients, thereby reducing overall device complexity.
Solution Approach 2:
The circuit incorporates selectable switching capability through the voltage divider configuration, allowing dynamic selection of different temperature coefficients based on operational requirements. The buffer circuits enable flexible connection and disconnection of different voltage paths, providing adaptability without requiring permanent complex circuit configurations for each possible temperature coefficient.
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
Enables precise temperature compensation in electrical circuits by providing output voltages with customizable temperature coefficients, improving the flexibility and accuracy of temperature adjustments.
Implementation Method 1
a band-gap reference voltage circuit configured to offset a positive temperature coefficient of a voltage appeared at a resistor and a negative temperature coefficient of a base-emitter voltage of a diode-connected bipolar transistor
Implementation Method 2
A voltage divider circuit is connected between an output terminal of the first buffer circuit and an output terminal of the second buffer circuit, and configured to divide the voltage appeared between the output terminals so that a voltage having any one of temperature coefficients different from each other can be extracted
Data Source
AI summary
A temperature sensor circuit includes a band-gap reference voltage circuit. The resistor and diode-connected bipolar transistor of the band-gap reference voltage circuit are separated into a transistor-resistor series circuit and a transistor-diode series circuit. The transistor-resistor series circuit is configured such that an emitter of the bipolar transistor Q21 is connected to a power supply voltage terminal VCC, a collector thereof is grounded via the resistor R2. The transistor-diode series circuit is configured such that an emitter of the bipolar transistor Q20 is connected to the power supply voltage terminal VCC, a collector thereof is connected to a collector of the diode-connected bipolar transistor Q19, and an emitter of the diode-connected bipolar transistor is grounded. A voltage divider circuit 5 having a plurality of output terminals is connected to the transistor-resistor series circuit and the transistor-diode series circuit via first and second buffer circuits 3 and 4, respectively.