Voltage Generating Device Two-Stage Calibration Bandgap Circuit
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Solution Overview
Problem
Existing voltage generating devices in electronic circuits face challenges in providing a stable and accurate reference voltage, particularly due to temperature drift and noise interference, which affects the accuracy of output voltage.
Innovation Solution
A voltage generating device comprising a bandgap circuit with a chopper amplifier and a regulator circuit, coupled with a calibrating circuit that adjusts resistors in two stages of calibration to achieve precise voltage generation, eliminating clock noise and improving temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a bandgap circuit is used to provide reference voltage, then voltage stability is improved, but temperature drift and noise interference affect measurement precision
Solution Approach 1:
The patent applies preliminary action by performing two-stage calibration before normal operation. In the first calibration stage, the calibrating circuit adjusts the bandgap circuit resistor to compensate for temperature drift effects. In the second calibration stage, it adjusts the regulator circuit resistor to eliminate clock noise from the chopper amplifier. This preliminary calibration ensures that when the device enters normal operation, the output voltage maintains high accuracy despite temperature variations and noise interference.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting resistor values in the bandgap circuit and regulator circuit based on detected voltage deviations. The calibrating circuit modifies the resistance parameters of these components to compensate for temperature drift and noise effects, thereby maintaining precise voltage output across varying operating conditions.
2Measurement precision
If a chopper amplifier is used in the bandgap circuit, then voltage accuracy is improved, but clock noise is introduced
Solution Approach 1:
The patent applies preliminary action by implementing a second calibration stage that specifically targets and eliminates clock noise from the chopper amplifier. During this stage, the calibrating circuit adjusts the regulator circuit resistor based on detected output voltage deviations caused by clock noise. This preliminary noise elimination ensures that when normal operation begins, the output voltage is free from significant clock noise interference.
Solution Approach 2:
The patent utilizes feedback by employing the calibrating circuit to continuously monitor the output voltage and detect deviations caused by clock noise. Based on this feedback information, the calibrating circuit automatically adjusts the regulator circuit resistor to compensate for the noise effects, thereby maintaining clean output voltage.
3Measurement precision
If calibration circuits and two-stage calibration process are added, then voltage accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the calibrating circuit to perform multiple functions: it calibrates both the bandgap circuit resistor and the regulator circuit resistor through two distinct calibration stages. This multi-functional approach achieves high voltage accuracy while avoiding the need for separate dedicated calibration circuits for each stage, thereby limiting the increase in overall device complexity.
Data Source
AI summary
The disclosure provides a voltage generating device and a calibrating method thereof. The voltage generating device includes a bandgap circuit, a regulator circuit and a calibrating circuit. The bandgap circuit provides a bandgap voltage. The regulator circuit generates an output voltage correspondingly according to the bandgap voltage. In a first stage of a calibration period, the calibrating circuit detects the bandgap voltage, and correspondingly sets a resistance of at least one resistor of the bandgap circuit according to the bandgap voltage. In a second stage of the calibration period, the calibrating circuit detects the output voltage, and correspondingly sets a resistance of at least one resistor of the regulator circuit according to the output voltage.