Multiplexer Switching With Shared Dummy Charge Injection Reduction
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Solution Overview
Problem
Analog multiplexers face challenges with charge injection and capacitance issues due to dummy components, which can lead to sub-optimal performance and increased power consumption, especially when switches are weakly driven by common power rails.
Innovation Solution
A multiplexer design that incorporates a single dummy component using a break-before-make action to reduce charge injection while minimizing capacitance, along with separate driving of gates and bulks to reduce coupling during switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dummy components are added to reduce charge injection, then charge injection is reduced, but device complexity and power consumption increase
Solution Approach 1:
The patent merges multiple dummy components into a single shared dummy component that services multiple switches. This single dummy component is coupled to multiple switches through a tree structure, allowing one component to reduce charge injection for all connected switches simultaneously, thereby reducing overall device complexity while maintaining charge injection reduction benefits
Solution Approach 2:
The single dummy component performs multiple functions by being shared across multiple switches. It reduces charge injection for each connected switch during their respective switching operations, making the dummy component universal rather than dedicated to a single switch, thus reducing the total number of dummy components needed
2Object-affected harmful factors
If dummy components are added to reduce charge injection, then charge injection is reduced, but power consumption increases
Solution Approach 1:
By combining multiple dummy components into one shared component, the total power consumption is reduced since there is only one dummy component consuming power instead of multiple separate components, each consuming power independently
Solution Approach 2:
The single dummy component automatically reduces charge injection for all connected switches during their switching operations without requiring additional active control or power-consuming intervention, effectively serving multiple switches with a single passive component
3Object-affected harmful factors
If gates and bulks are separately driven, then charge injection reduction is improved, but device complexity increases
Solution Approach 1:
The patent segments the control of each switch into two independent parts: gate control and bulk control. By separately driving the gates and bulks of the switches, the patent reduces coupling effects during switching operations, which improves charge injection reduction. This segmentation allows independent optimization of gate and bulk signals
Data Source
AI summary
A multiplexer comprises: a first switch; a second switch; a dummy component coupled to the first switch and the second switch and configured to: reduce a first charge injection of the first switch, and reduce a second charge injection of the second switch; and an output coupled to the first switch, the second switch, and the dummy component. A method comprises: providing an output from either a first switch or a second switch; coupling, by a dummy component, to the first switch and the second switch; using a BBM action; and reducing, by the dummy component, a first charge injection of the first switch or a second charge injection of the second switch.