Amplifier Resistor Network Layout for Precise Gain Setting
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Solution Overview
Problem
Existing amplifier arrangements face challenges in accurately setting the gain factor due to fluctuations in resistor values, leading to limited accuracy and increased area requirements for resistor realization.
Innovation Solution
The use of first and second resistor networks with resistors of the same nominal value, arranged in parallel circuits, allows for precise control of the gain factor through the ratio of their total resistance values, reducing variations and optimizing area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistor values are used to set the gain factor in conventional amplifier arrangements, then the gain factor can be adjusted, but the accuracy is limited due to fluctuations in resistor values
Solution Approach 1:
The feedback resistor is divided into multiple segments (first feedback resistor and second feedback resistor) that can be independently switched. This segmentation allows for more precise gain factor adjustment by selectively connecting different resistor segments, thereby improving gain factor accuracy while compensating for individual resistor value fluctuations.
Solution Approach 2:
The amplifier arrangement incorporates switches that enable dynamic reconfiguration of the feedback resistor network. By dynamically switching between different resistor combinations, the system can adapt to and compensate for resistor value fluctuations, maintaining accurate gain factor setting across varying conditions.
2Measurement precision
If multiple resistors with different nominal values are used to achieve precise gain factor setting, then accuracy improves, but the area requirement for resistor realization increases
Solution Approach 1:
Instead of using resistors with different nominal values, the invention uses multiple resistors with the same nominal value that can be switched in series or parallel configurations. By changing the effective resistance through switching different numbers of identical resistors, the system achieves precise gain factor setting without requiring multiple different resistor values, thereby reducing the total area required.
Solution Approach 2:
Resistors with the same nominal value serve multiple functions by being switched in different configurations (series, parallel, or individually). This multi-functionality allows a single set of identical resistors to replace what would traditionally require multiple different resistor values, optimizing the use of chip area while maintaining gain factor accuracy.
3Manufacturing precision
If conventional resistor networks are used in amplifier arrangements, then the circuit can function, but the area requirements increase and precision is limited
Solution Approach 1:
The invention achieves high-precision gain factor setting by changing the effective resistance parameters through switching identical resistors in different configurations rather than using physically larger resistor networks with different nominal values. This approach maintains manufacturing precision while minimizing the area required for the amplifier arrangement.
Data Source
AI summary
In one embodiment, an amplifier arrangement includes an amplifier having a first input, a second input and an output, a first resistor network, having a first parallel circuit formed by a first number N of resistors, and a second resistor network, having a first resistor or a second parallel circuit formed by a second number M of resistors. The resistors of the first and second resistor networks each have approximately the same nominal value, an approximately identical width W and an approximately identical length L of a resistive layer. The first and second resistor networks are coupled to the amplifier.