Bootstrapped Switch Topology for Faster Gate Voltage Transitions
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Solution Overview
Problem
Conventional bootstrapped switches face limitations in rapid switching speed due to the design of the gate driver circuit, which affects their performance in terms of speed and accuracy.
Innovation Solution
The introduction of an inverter circuit and a second capacitor in the bootstrapped switch configuration, along with specific switch control mechanisms, enhances the switching speed by rapidly pulling up or down the voltage at the control terminal of the transistor, allowing for faster turn-on and turn-off operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional bootstrapped switch configuration is used, then the circuit structure is simple, but the switching speed is limited and cannot respond rapidly to system clock changes
Solution Approach 1:
The inverter circuit is configured to preemptively invert the control signal before it reaches the control terminal of the transistor. This preliminary action allows the voltage at the control terminal to transition faster than it would with conventional switching, enabling the bootstrapped switch to respond more rapidly to clock changes without requiring a complete redesign of the basic circuit architecture.
Solution Approach 2:
The inverter circuit acts as an intermediary between the control signal source and the transistor control terminal. By introducing this intermediate stage, the control signal is transformed in a way that accelerates voltage transitions at the control terminal, thereby improving switching speed while maintaining overall circuit manageability.
2Speed
If the gate driver circuit is designed for rapid switching, then the switching speed improves, but the alignment with system clock becomes less accurate
Solution Approach 1:
The inverter circuit provides a controlled feedback mechanism where the output of the inverter is fed back to influence the control terminal voltage. This feedback loop ensures that the voltage transitions occur at precisely the right moments relative to the system clock, maintaining accurate clock alignment while achieving rapid switching through the inverted signal path.
Data Source
AI summary
A bootstrapped switch includes a first transistor, a second transistor, a first capacitor, three switches, and a switch circuit. The switch circuit includes a first switch, a second switch, a second capacitor, and an inverter circuit. The first transistor receives the input voltage and outputs the output voltage. The first terminal of the second transistor receives the input voltage, and the second terminal of the second transistor is coupled to the first terminal of the first capacitor. The control terminal of the first switch receives a clock. The second switch is coupled between the control terminal of the first transistor and the first switch. The input terminal of the inverter circuit is coupled to the control terminal of the first switch. The second capacitor is coupled between the control terminal of the first transistor and the output terminal of the inverter circuit.