Dual-Capacitor Bootstrapped Switch for Continuous High-Frequency Operation
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Solution Overview
Problem
The operating frequency of conventional bootstrapped switches is limited by the need to charge the bootstrap capacitor, which reduces the overall circuit performance.
Innovation Solution
A bootstrapped switch design that alternately uses two capacitors as bootstrap capacitors, allowing continuous operation without waiting for charging, achieved through a bootstrap capacitor switching circuit and synchronized clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single bootstrap capacitor is used in a conventional bootstrapped switch, then the circuit structure is simple, but the operating frequency is limited due to the need to charge the capacitor
Solution Approach 1:
The single bootstrap capacitor is segmented into two capacitors (first bootstrap capacitor and second bootstrap capacitor). Each capacitor serves a specific function: one charges while the other provides bootstrapping voltage to the switch gate. This segmentation eliminates the charging wait time that limits operating frequency, while keeping each capacitor's individual structure simple.
Solution Approach 2:
The first bootstrap capacitor charges in advance during periods when the second capacitor is actively providing bootstrapping voltage. This preliminary charging action ensures that a charged capacitor is always available for immediate use, eliminating idle wait time and enabling continuous high-frequency operation.
2Productivity
If the bootstrap capacitor charges during operation, then the capacitor can be recharged, but the charging process interrupts continuous operation and reduces frequency
Solution Approach 1:
The circuit maintains continuous useful action by ensuring that one capacitor is always providing bootstrapping voltage while the other charges. The switching mechanism guarantees uninterrupted gate voltage supply to the switch, eliminating idle periods and enabling sustained high-frequency operation without charging interruptions.
Solution Approach 2:
One capacitor charges in advance while the other is in use, preparing a charged capacitor for immediate takeover. This preliminary charging action eliminates wait time during switching, ensuring continuous operation without interruption to the bootstrapping function.
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
Significantly increases the operating frequency of the bootstrapped switch by enabling continuous operation, improving circuit performance.
Implementation Method 1
a first capacitor and a second capacitor... When the first capacitor is charging, the second capacitor is coupled between the first node and the second node. When the second capacitor is charging, the first capacitor is coupled between the first node and the second node
Data Source
AI summary
A bootstrapped switch has an input terminal and an output terminal and includes four switches and a bootstrap capacitor switching circuit. The bootstrapped switch is turned on or off according to a clock. The bootstrap capacitor switching circuit is coupled to the four switches and includes a first capacitor and a second capacitor. When the first capacitor is charging, the second capacitor functions as a bootstrap capacitor of the bootstrapped switch, and when the second capacitor is charging, the first capacitor functions as the bootstrap capacitor of the bootstrapped switch.