Offset Adjusting Circuit for Band Gap Voltage Reference
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Solution Overview
Problem
Conventional temperature detecting circuits in integrated circuits face inaccuracies due to offsets in reference voltages, leading to errors in temperature detection.
Innovation Solution
A temperature detecting circuit is designed with a band gap voltage generating circuit and an offset adjusting circuit, which includes a current source and a resistor string, allowing for adjustment of the reference current and resistor units to compensate for voltage offsets, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a temperature independent reference voltage is used for temperature detection, then the circuit can operate with stable reference, but offset errors occur on the reference voltage leading to inaccurate temperature detection
Solution Approach 1:
The patent applies preliminary action by adjusting the reference current or resistor units before actual temperature detection to pre-compensate for voltage offsets. The offset adjusting circuit modifies the reference voltage characteristics in advance so that when temperature detection occurs, the offset errors have already been corrected, ensuring accurate measurements without affecting the stability of the reference voltage during operation.
2Measurement precision
If offset compensation is implemented by adjusting reference current or resistor units, then temperature detection accuracy improves, but circuit complexity increases
Solution Approach 1:
The patent introduces an offset adjusting circuit as an intermediary component between the band gap voltage generating circuit and the temperature detection circuit. This intermediary contains adjustable reference current sources and resistor units that can be tuned to compensate for voltage offsets. By placing this adjustment mechanism in the intermediate stage, the patent achieves offset compensation without requiring complex modifications to the core temperature detection functionality, thus balancing accuracy improvement with acceptable circuit complexity.
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 compensates for errors caused by voltage offsets, enhancing the accuracy of temperature detection in integrated circuits.
Implementation Method 1
a band gap voltage generating circuit generates a reference voltage according to a bias voltage
Implementation Method 2
the voltage dividing circuit divides the reference voltage to generate a plurality of output voltages
Implementation Method 3
The resistor string receives the reference current and generates a plurality of adjusted output voltage accordingly
Data Source
AI summary
A temperature detecting circuit is provided. The temperature detecting circuit includes a band gap voltage generating circuit and an offset adjusting circuit. The band gap voltage generating circuit generates a reference voltage according to a bias voltage. The band gap voltage generating circuit has a voltage dividing circuit, and the voltage dividing circuit divides the reference voltage to generate a plurality of output voltages. The offset adjusting circuit includes a current source and a resistor string. The current source provides a reference current. The resistor string receives the reference current and generates a plurality of adjusted output voltage accordingly. At least one of a current value of the reference current and a resistance of each of the resistor units is provided to be adjusted to force a voltage on an output terminal of the current source to be substantially equal to one of the reference voltage and the output voltages.