Bandgap Circuit Calibration for Temperature-Stable Output Voltage
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Solution Overview
Problem
Existing bandgap circuits face challenges in achieving temperature stability and efficiency due to manufacturing dispersions and complex calibration procedures.
Innovation Solution
The proposed bandgap circuit incorporates a control circuit that adjusts the resistance values of resistors R2 and R3 through N controllable parts, allowing for independent settings of the output voltage and temperature slope, thereby compensating for manufacturing dispersions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known bandgap circuits use fixed resistor values to generate temperature-stable voltage, then the circuit structure is simple, but the circuit cannot compensate for manufacturing dispersions and achieves poor temperature stability
Solution Approach 1:
The patent applies the dynamics principle by replacing fixed resistor values with adjustable resistor values that can be dynamically tuned during calibration. The resistor values are made variable through controlled association (e.g., switching networks, digital-to-analog converters) allowing the bandgap circuit to adapt its resistance parameters to compensate for manufacturing variations and achieve optimal temperature stability.
Solution Approach 2:
The patent implements parameter changes by modifying the resistance values of resistors in the bandgap circuit through controlled association mechanisms. This allows the electrical parameters (resistance) to be adjusted during calibration to compensate for manufacturing dispersions, thereby improving temperature stability without requiring a complete redesign of the circuit architecture.
2Ease of manufacture
If known bandgap circuits use fixed resistor values, then the manufacturing process is simple, but calibration procedures become complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by performing calibration adjustments during the manufacturing process itself rather than requiring separate post-manufacturing calibration steps. The controlled association mechanisms allow resistor values to be set and optimized before the device leaves the fabrication line, reducing subsequent calibration time and complexity while maintaining ease of manufacture.
3Adaptability or versatility
If known bandgap circuits use fixed resistor values, then the circuit design is straightforward, but the output voltage cannot be adjusted for manufacturing variations
Solution Approach 1:
The patent makes the resistor configuration dynamic by introducing controlled association mechanisms that allow resistor values to be adjusted based on manufacturing variations. This dynamic adjustment capability enables the output voltage to be adapted for different manufacturing batches while managing complexity through systematic control methods.
Solution Approach 2:
The patent changes the resistance parameters of the circuit to enable output voltage adjustment. By making resistor values variable through controlled association, the circuit can adapt its electrical parameters to compensate for manufacturing variations, achieving versatility without excessive complexity.
Data Source
AI summary
A bandgap circuit includes: a first resistor receiving a voltage proportional to the temperature; a second resistor receiving a voltage complementary to absolute temperature; and a third resistor where the sum of the currents in the first and second resistors flows. Each of the second and third resistors comprises a fixed resistance part and N controllable resistance parts, with N greater than or equal to 2. Each controllable resistance part of the second resistor is associated with a corresponding controllable resistance part of the third resistor. A control circuit supplies, for each controllable resistance part, the same control signal to this controllable resistance part and its associated controllable resistance part.