Polysilicon Resistor Circuit Temperature Compensation
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Solution Overview
Problem
Existing resistor circuits with temperature coefficient compensation fail to maintain effective temperature coefficient compensation across various process corners, leading to deteriorated performance due to differing changes in resistance values of resistors with positive and negative temperature coefficients.
Innovation Solution
A resistor circuit design comprising a first series resistor with a positive temperature coefficient and a second series resistor with a negative temperature coefficient, interconnected in series, and a second parallel resistor with offsetting temperature coefficients, ensuring compensation across all process corners by integrating these resistors on a single silicon chip using CMOS process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistors with positive and negative temperature coefficients are interconnected in series for temperature coefficient compensation, then the temperature coefficient can be reduced or eliminated, but the compensation effect deteriorates when process corners cause resistance values to change in opposite directions
Solution Approach 1:
The patent applies local quality by using the same resistor type (polysilicon resistor) for both R1 and R2, ensuring they have identical temperature coefficient characteristics. This allows the temperature coefficient compensation to work reliably across all process corners, as both resistors respond identically to temperature and process variations.
Solution Approach 2:
The patent uses homogeneous materials by employing polysilicon resistors for both R1 and R2. This ensures that both resistors have the same temperature coefficient and respond consistently to process corners, enabling reliable temperature coefficient compensation without the resistance values changing in opposite directions.
2Adaptability or versatility
If different types of resistors are used to achieve different temperature coefficients, then temperature coefficient compensation can be achieved, but the resistance values become inconsistent under process variations
Solution Approach 1:
The patent achieves different temperature coefficients through local quality by using the same polysilicon resistor type but with different doping concentrations. This allows each resistor to have tailored temperature characteristics while maintaining consistent response to process variations, ensuring reliable compensation.
Solution Approach 2:
The patent applies parameter changes by modifying the doping concentration of polysilicon resistors to achieve different temperature coefficients. This allows temperature coefficient control while maintaining the same resistor type, ensuring that both resistors respond consistently to process corners and maintain reliable compensation.
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
The proposed circuit maintains temperature coefficient compensation across any combination of process corners, achieving high-precision resistance by offsetting temperature coefficients between series and parallel resistors, thereby stabilizing the overall resistance value.
Implementation Method 1
a first series resistor composed of a first polysilicon resistor and a second polysilicon resistor, wherein the first polysilicon resistor and the second polysilicon resistor offset a temperature coefficient of each other
Data Source
AI summary
The present invention discloses a resistor circuit with temperature coefficient compensation, which comprises a first series resistor composed of a first resistor and a second resistor interconnected in series, and a second parallel resistor composed of a third resistor and a fourth resistor interconnected in series, with the first series resistor and the second parallel resistor interconnected in series, wherein the first resistor and the second resistor respectively have a positive and negative temperature coefficient and make the positive and negative temperature coefficients of the first series resistor offset each other, and the third resistor and the fourth resistor respectively have a positive and negative temperature coefficient and make the positive and negative temperature coefficients of the second parallel resistor offset each other.