Current Control Apparatus for BJT Temperature Measurement
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Solution Overview
Problem
The dual current mode temperature measurement method for bipolar junction transistors (BJTs) is prone to errors due to variations in the β value, which affect the ratio between collector currents, leading to inaccurate temperature measurements.
Innovation Solution
A current control apparatus comprising a current control module, first and second current mirror modules, a current subtractor, and a current adjusting module, which generates and adjusts currents to maintain predetermined ratios, thereby stabilizing temperature measurement by applying a current control signal to the BJT's terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the dual current mode temperature measurement method is used to measure the temperature of the BJT, then the temperature can be measured, but temperature measurement errors occur when the β value becomes smaller and varies according to current variation
Solution Approach 1:
The patent changes the measurement parameters by introducing current mirror modules that create fixed current ratios, transforming the measurement approach from direct collector current ratio to controlled current mirror ratio, which remains stable despite β variations
Solution Approach 2:
The patent introduces current mirror modules as intermediary components between the measurement system and the BJT. These modules act as mediators that enforce fixed current ratios, isolating the measurement from the effects of β variation and enabling accurate temperature measurement
2Volume of moving object
If advanced process technology is used to reduce transistor size, then device scaling is achieved, but the β value becomes smaller and more variable
Solution Approach 1:
The patent compensates for the deteriorating β characteristics in advanced processes by changing the measurement parameter from direct collector current to controlled current mirror output, which maintains stable ratios independent of β variations
Solution Approach 2:
The current mirror modules provide a form of feedback control where the output currents are automatically adjusted to maintain fixed ratios with the reference currents, compensating for process variations and ensuring measurement accuracy in scaled devices
Data Source
AI summary
The present invention provides a current control apparatus applied to a transistor. The transistor has a control terminal, a first terminal, and a second terminal. The current control apparatus includes a current control module, a first current mirror module, a second current mirror module, a current subtractor, and a current adjusting module. The current control apparatus provided by the present invention can be applied to a bipolar junction transistor (BJT) to prevent temperature measurement errors from occurring when using a dual current mode temperature measurement method to measure the temperature of the BJT.