MOSFET Threshold Gap Circuit With Temperature Coefficient Trim
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Solution Overview
Problem
Existing reference voltage generation circuits face challenges in accurately generating reference voltages due to temperature drift, as the threshold voltage of MOSFETs is not modeled accurately, leading to reduced accuracy and inability to trim for temperature drift.
Innovation Solution
The proposed electronic circuits incorporate a comparator circuit with two transistors and a variable resistor, allowing for temperature coefficient trimming by adjusting the resistance of the variable resistor to correct for temperature drift and improve the accuracy of reference voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference voltage generation circuits use MOSFET threshold voltage difference, then reference voltage can be generated, but temperature drift occurs due to inaccurate threshold voltage modeling
Solution Approach 1:
The patent changes the resistance parameter of the variable resistor to adjust the temperature coefficient of the circuit. By varying the resistance value, the circuit can compensate for temperature drift and maintain accurate reference voltage generation across different temperatures.
Solution Approach 2:
The patent implements a feedback mechanism where the temperature coefficient is trimmed by adjusting the variable resistor based on temperature conditions. This feedback loop allows the circuit to automatically compensate for temperature-induced voltage drift and maintain precision.
2Ease of manufacture
If fixed resistance is used in the circuit, then circuit structure is simple, but temperature drift cannot be compensated
Solution Approach 1:
The patent replaces the fixed resistor with a variable resistor that can dynamically adjust its resistance value to compensate for temperature drift. This dynamic element allows the circuit to adapt to changing temperature conditions while maintaining a relatively simple overall structure.
Solution Approach 2:
By introducing a variable resistor, the circuit can change the resistance parameter to compensate for temperature effects. This parameter adjustment enables temperature drift compensation without significantly complicating the circuit architecture.
Data Source
AI summary
An electronic circuit includes a first transistor, a second transistor, and a variable resistor. The first transistor has a first threshold voltage. The second transistor has a second threshold voltage that is different from the first threshold voltage. The second transistor is coupled to the first transistor. The variable resistor is coupled to the first transistor and the second transistor. The variable resistor is configured to adjust a temperature coefficient of the electronic circuit. The electronic circuit is configured to generate a reference voltage based on a difference of the first threshold voltage and the second threshold voltage.