Self-Calibrating Digital Bandgap Voltage Reference Circuit
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Solution Overview
Problem
Conventional bandgap reference voltage generators require time-consuming and expensive calibration processes due to non-ideal component behavior and temperature-dependent variations, which affect the accuracy and stability of the reference voltage.
Innovation Solution
A reference voltage generator that includes a processing module and a digital-to-analog converter (DAC) to process PTAT and CTAT voltages, generating a temperature-independent reference voltage without the need for external calibration, using a self-calibrating control loop to adjust and stabilize the output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bandgap reference voltage generators are used, then temperature compensation is achieved, but calibration time and cost increase significantly
Solution Approach 1:
The reference voltage generator performs self-calibration by using its own output voltage to determine and adjust its internal parameters. The processing module measures the initial reference voltage and automatically calculates the compensation value without requiring external calibration equipment, making the system self-sufficient and eliminating time-consuming external calibration processes.
Solution Approach 2:
The system implements a feedback mechanism where the processing module continuously monitors the reference voltage output and adjusts the compensation value based on measured deviations. This closed-loop feedback ensures the reference voltage remains stable and accurate across temperature variations without manual intervention.
2Reliability
If conventional bandgap reference voltage generators are used, then temperature compensation is achieved, but calibration cost increases due to sophisticated testing equipment
Solution Approach 1:
The reference voltage generator performs self-calibration by using its own output voltage to determine and adjust its internal parameters. The processing module measures the initial reference voltage and automatically calculates the compensation value without requiring external calibration equipment, making the system self-sufficient and eliminating time-consuming external calibration processes.
Solution Approach 2:
The invention replaces complex external calibration equipment with a digital processing module that performs calculations and adjustments using standard electronic components. This substitution of sophisticated testing equipment with integrated digital processing significantly reduces calibration costs and simplifies the manufacturing process.
3Measurement precision
If complex calibration techniques are used for sensitive circuits, then measurement precision improves, but device complexity increases
Solution Approach 1:
The system achieves high measurement precision by dynamically changing the compensation parameter based on the measured reference voltage. The processing module calculates an optimal compensation value that adjusts the reference voltage output, achieving high accuracy through parameter optimization rather than complex circuit architecture.
Solution Approach 2:
The invention replaces complex calibration equipment with a digital processing module that performs calculations and adjustments using standard electronic components. This substitution of sophisticated testing equipment with integrated digital processing significantly reduces calibration costs and simplifies the manufacturing process.
4Measurement precision
If multiple voltage generators are calibrated individually, then each generator achieves accurate reference voltage, but total calibration time multiplies
Solution Approach 1:
Each reference voltage generator independently performs self-calibration using its own output voltage, eliminating the need for sequential calibration by external equipment. This autonomy allows multiple generators to be calibrated simultaneously or in rapid succession, dramatically improving production throughput while maintaining individual accuracy.
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
This solution eliminates the need for extensive calibration, reduces costs, and ensures a stable, temperature-independent reference voltage, improving the efficiency and accuracy of the reference voltage generation process.
Implementation Method 1
The first voltage is proportional to absolute temperature (PTAT) and the second voltage is complementary to absolute temperature (CTAT)
Implementation Method 2
The first voltage is proportional to absolute temperature (PTAT) and the second voltage is complementary to absolute temperature (CTAT)
Implementation Method 3
a digital to analog converter (DAC) configured to generate a reference voltage based on the value
Data Source
AI summary
A reference voltage generator is provided. In an example, the reference voltage generator includes a temperature-dependent device, a processing module configured to process a digital representations of first and second voltages derived from the temperature-dependent device and a reference voltage to determine a value, and a digital to analog converter (DAC) configured to generate a reference voltage based on the value. The first voltage is proportional to absolute temperature (PTAT) and the second voltage is complementary to absolute temperature (CTAT) and the reference voltage is substantially independent of absolute temperature in an operating temperature range of the reference voltage generator.