Voltage Trimming Circuit for Semiconductor Temperature Stability
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Solution Overview
Problem
Conventional semiconductor voltage trimming circuits fail to maintain a stable internal voltage across varying temperatures, as the reference voltage level changes with temperature, leading to an inability to trim the voltage slope effectively.
Innovation Solution
A voltage trimming circuit comprising a first and second voltage trimming unit, each configured to trim reference voltages with distinct temperature characteristics, and an adjusting unit that forms a potential difference between these to generate a final trimming reference voltage with a target level at different temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single reference voltage is trimmed to achieve target level at specific temperature, then voltage precision is improved at that temperature, but voltage stability deteriorates when temperature changes
Solution Approach 1:
The reference voltage generation is divided into two independent segments: a first reference voltage with positive temperature coefficient and a second reference voltage with negative temperature coefficient. Each segment is independently trimmed and combined, allowing separate optimization of precision and temperature compensation without interfering with each other's function.
Solution Approach 2:
The patent changes the temperature characteristic parameter of the reference voltage by combining two voltages with opposite temperature coefficients. By adjusting the weighting coefficients (alpha and beta) in the combination formula Vref = alpha*Vref1 + beta*Vref2, the overall temperature dependence can be controlled to achieve both precision at target temperature and stability across temperature ranges.
2Device complexity
If reference voltage is trimmed using conventional single-stage method, then circuit complexity is reduced, but adaptability to different temperature conditions deteriorates
Solution Approach 1:
The trimming function is segmented into two independent trimming units: a first trimming unit for the positive temperature coefficient voltage and a second trimming unit for the negative temperature coefficient voltage. This segmentation allows each unit to be optimized for its specific temperature characteristic while maintaining overall circuit manageability through modular design.
Solution Approach 2:
The reference voltage system uses a composite approach by combining two voltages with opposite temperature coefficients (positive and negative). This composite structure creates a reference voltage that can be trimmed to achieve target precision at a specific temperature while inherently providing temperature compensation, thus improving adaptability without requiring overly complex circuitry.
Data Source
AI summary
A voltage trimming circuit of a semiconductor apparatus includes: a first voltage trimming unit configured to trim a first reference voltage having a first characteristic with respect to temperature based on a first trimming signal, and generate a first trimming reference voltage; a second voltage trimming unit configured to trim a second reference voltage having a second characteristic with respect to the temperature based on a second trimming signal, and generate a second trimming reference voltage; and an adjusting unit configured to trim a voltage formed from a potential difference between the first and second trimming reference voltages based on a select signal, and generate a final trimming reference voltage.