Reconfigurable Current Comparator for Multi-Threshold Accuracy
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Solution Overview
Problem
Current comparators face inaccuracies due to process variations and require a large number of components, leading to increased power consumption and component count, which affects their performance in comparing input currents to multiple thresholds.
Innovation Solution
The design incorporates a single current path with reconfigurable comparators and threshold current sources/sinks to accurately compare input currents to multiple thresholds, reducing component count and power consumption by eliminating the need for replica current generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple comparators are used to compare input current to multiple thresholds, then comparison accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent divides the comparison function into segments by using a single comparator that sequentially compares the input current against different threshold currents at different times. The comparison range is segmented into multiple intervals, and the comparator is reconfigured through switching to compare against each threshold in sequence, eliminating the need for multiple parallel comparators.
Solution Approach 2:
The patent makes the comparator dynamic by allowing its reference input to change over time. Switching elements reconfigure the threshold current sources connected to the comparator's reference input, enabling the same comparator to adaptively compare against different thresholds based on the desired measurement range, rather than being fixed to a single threshold.
2Measurement precision
If multiple comparators are used to compare input current to multiple thresholds, then comparison accuracy is improved, but power consumption increases
Solution Approach 1:
The patent merges the functionality of multiple comparators into a single comparator by time-multiplexing its operation. The same comparator circuit is reused for multiple comparison tasks by sequentially connecting it to different threshold current sources through switching elements, thereby combining what would have been separate power-consuming comparator circuits into one shared resource.
Solution Approach 2:
The dynamic reconfiguration of the comparator's reference input allows a single comparator to perform multiple comparison functions that would otherwise require multiple static comparators. By dynamically switching the threshold current sources connected to the comparator, the system achieves multi-threshold comparison capability with the power consumption of a single comparator.
3Reliability
If replica current generation is used in current comparators, then comparison functionality is achieved, but component count and power consumption increase
Solution Approach 1:
The patent extracts and eliminates the replica current generation stage from the comparator architecture. Instead of generating replica currents through additional current sources and switching networks, the design directly compares the actual input current against threshold currents, removing the unnecessary replica generation components and their associated power consumption.
Solution Approach 2:
The patent eliminates the need for copying the input current to create replica currents. By directly comparing the original input current against threshold currents using a single comparator, the design removes the copying mechanism entirely, reducing component count while maintaining comparison functionality.
Data Source
AI summary
A current comparator including a first comparator configured to generate a first output signal based on a comparison of a first current to at least a second current; a second comparator configured to generate a second output signal based on a comparison of the first current to at least a third current; and a circuit configured to: direct the first current to the first comparator to perform the comparison of the first current to the at least the second current while blocking the first current from being applied to the second comparator; or direct the first current to the second comparator to perform the comparison of the first current to the at least the third current while blocking the first current from being applied to the first comparator.