Binary Weighted Divider Compensation Switch Network
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Solution Overview
Problem
Existing binary weighted divider circuits face inaccuracies due to high switch resistance and large integrated circuit die areas, leading to non-linear voltage scaling and increased parasitic capacitance, which degrades performance and increases costs.
Innovation Solution
A compensation switch network is introduced to reduce the resistance of activated switches by providing parallel current paths, allowing for smaller switches with larger resistances to be used, thereby improving accuracy and reducing the overall resistance and parasitic capacitance while minimizing the integrated circuit die area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional binary weighted divider circuits are used, then the circuit structure is simple, but the switch resistance is high leading to accuracy degradation
Solution Approach 1:
The divider circuit is segmented into multiple parallel paths, each containing switches with different resistance characteristics. This segmentation allows the circuit to achieve accurate voltage division by combining multiple paths, reducing the impact of individual switch resistance while maintaining overall circuit simplicity.
Solution Approach 2:
An intermediary compensation circuit is introduced that includes parallel switch paths and resistance compensation elements. This intermediary structure mediates between the simple traditional divider and the accuracy requirement, compensating for switch resistance effects without requiring complete redesign of the original circuit.
2Measurement precision
If larger switches are used to reduce resistance, then the switch resistance decreases, but the integrated circuit die area increases
Solution Approach 1:
The switch network is segmented into multiple smaller switches arranged in parallel paths rather than using a single large switch. This segmentation reduces the die area required while achieving equivalent or better resistance characteristics through the parallel combination of multiple smaller switch elements.
Solution Approach 2:
Multiple parallel current paths are merged to provide equivalent resistance reduction. The combination of several smaller switch paths achieves the same resistance reduction effect as a single large switch, but with significantly reduced die area occupation.
3Measurement precision
If more switches and resistors are added to improve accuracy, then the voltage setting accuracy improves, but the device complexity and cost increase
Solution Approach 1:
The parallel switch paths serve multiple functions simultaneously: they provide resistance reduction, enable accurate voltage division ratios, and offer parasitic capacitance reduction. This multi-functionality achieves high accuracy without proportionally increasing component count or circuit complexity.
Solution Approach 2:
The circuit utilizes parameter changes in the parallel paths, where the resistance and capacitance values are carefully selected to compensate for each other's effects. By changing parameters such as path resistance and capacitance values, the circuit achieves accurate voltage division without requiring excessive components.
4Reliability
If traditional divider circuits are used, then the implementation is straightforward, but parasitic capacitance is high degrading performance
Solution Approach 1:
The capacitor network is segmented into multiple smaller capacitive elements distributed across parallel paths. This segmentation reduces the effect of parasitic capacitance by distributing the total capacitance across multiple smaller elements, thereby improving circuit performance and reliability.
Solution Approach 2:
Compensation capacitors are introduced as intermediary elements that counterbalance the parasitic capacitance effects. These intermediary capacitive elements are strategically placed to cancel out harmful parasitic effects, improving overall circuit performance without requiring complete circuit redesign.
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 compensation switch network enhances the accuracy of the binary weighted divider, reduces parasitic capacitance, and decreases the number of switches and resistors required, resulting in a more efficient and cost-effective implementation compared to existing solutions.
Implementation Method 1
The set of compensation switches is configured to reduce resistance of one or more of the respective switches in the first set of switches that are activated by activating one or more switches in the set of compensation switches to provide one or more respective parallel current paths
Implementation Method 2
The first set of switches is configured to set a feedback voltage at the feedback node in response to activating or deactivating respective switches in the first set of switches
Data Source
AI summary
A circuit includes a binary weighted divider having a first set of switches coupled in series between an input node and a feedback node. The first set of switches is configured to set a feedback voltage at the feedback node in response to activating or deactivating respective switches in the first set of switches. A set of compensation switches is coupled to the first set of switches. The set of compensation switches is configured to reduce resistance of one or more of the respective switches in the first set of switches that are activated by activating one or more switches in the set of compensation switches to provide one or more respective parallel current paths for each of the switches in the first set of switches that are activated.