Parallel Switch Circuit for Fast Switching and Surge Dissipation
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Solution Overview
Problem
Conventional switch devices with large-sized transistors in shunt circuits experience reduced switching speed due to parasitic capacitance, affecting signal transmission performance.
Innovation Solution
Incorporating a second switch in parallel with the first switch, both with transistors of the same type, to improve switching speed and surge current dissipation in a surge protection mode by controlling the switches with separate control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-sized transistor is disposed in a shunt circuit to effectively discharge electrostatic discharge current, then the ability to withdraw electrostatic discharges is increased, but the parasitic capacitance increases which reduces the switching speed
Solution Approach 1:
The shunt circuit is segmented into two separate transistors: a first transistor optimized for electrostatic discharge protection with larger size, and a second transistor optimized for switching operations with smaller size. This segmentation allows each transistor to be independently optimized for its specific function, resolving the contradiction between protection capability and switching speed.
Solution Approach 2:
The first transistor serves dual purposes: it provides electrostatic discharge protection during surge events and can also function as a switching element during normal operations. The second transistor handles routine switching tasks. This multi-functionality approach allows the system to maintain both high protection capability and fast switching performance.
2Reliability
If a large-sized transistor is used in the shunt circuit to handle surge current, then the surge current dissipation ability is improved, but the parasitic capacitance increases which affects signal transmission performance
Solution Approach 1:
The surge current handling function is segmented from the switching function. The first transistor with larger size is dedicated to handling surge currents and electrostatic discharges, while the second transistor with smaller size handles switching operations. This segmentation isolates the parasitic capacitance of the large transistor from the signal transmission path during normal operations.
Solution Approach 2:
The circuit dynamically switches between different transistor configurations based on operating conditions. During surge events, the first transistor is activated to handle high current. During normal switching operations, the second transistor is used to minimize parasitic capacitance effects. This dynamic adaptation allows the system to optimize performance for different operating modes.
Data Source
AI summary
The switch device includes a first circuit. The first circuit has a first end coupled between a first terminal and a second terminal, and the first circuit has the second end coupled between the first terminal and the second terminal or coupled to a third terminal. The first circuit includes a first switch and a second switch. The first switch is coupled between the first end and the second end of the first circuit and is turned on or off according to a first control signal. The second switch is connected to the first switch in parallel and is turned on or off according to a second control signal. The first switch and the second switch include transistors of the same type. In a surge protection mode, the second switch is turned on to dissipate the surge current.