RF Switch Gate-Capacitor Circuit for Faster Settling
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Solution Overview
Problem
Conventional RF switches face challenges in reducing switching and settling times without degrading isolation performance and increasing losses.
Innovation Solution
A switch assembly comprising a series of transistors with capacitive components and resistive elements, where the capacitive components accrue opposite charges to facilitate faster switching by varying the voltage at the capacitive node, and a bypassable resistance structure to reduce the RC time constant during state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional approaches are used to reduce switching/settling times, then switching speed is improved, but isolation performance degrades and losses increase
Solution Approach 1:
The gate control path is segmented into two independent paths: a first path through a resistor for normal operation maintaining isolation, and a second path through a switch for fast switching. This segmentation allows each path to be optimized for its specific function without compromising the other.
Solution Approach 2:
A capacitor is pre-charged to a voltage that enables rapid discharge through the switch during fast switching events. This preliminary charging action stores energy in advance, allowing the capacitor to quickly discharge and accelerate the switching process when needed, without degrading isolation during normal operation.
2Speed
If conventional approaches are used to reduce switching/settling times, then switching speed is improved, but losses in the switch increase
Solution Approach 1:
The gate control path is segmented into two independent paths: a first path through a resistor for normal operation maintaining isolation, and a second path through a switch for fast switching. This segmentation allows each path to be optimized for its specific function without compromising the other.
Solution Approach 2:
A capacitor is pre-charged to a voltage that enables rapid discharge through the switch during fast switching events. This preliminary charging action stores energy in advance, allowing the capacitor to quickly discharge and accelerate the switching process when needed, without degrading isolation during normal operation.
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
The solution achieves faster switching times while maintaining isolation performance and reducing losses, enabling efficient RF signal processing in wireless communication devices.
Implementation Method 1
a plurality of capacitive components, one capacitive component being coupled between each intermediate node and the capacitive node, a voltage at the capacitive node being configured to be varied with a voltage at the second control node such that, at each intermediate node, the capacitive component is configured to accrue an opposite charge to the transistors
Data Source
AI summary
A switching component and switch assembly. The switching component comprises a first control node, a common node, a plurality of intermediate nodes, a second control node, and a capacitive node; a plurality of transistors connected in series between the control node and the common node, one of the plurality of intermediate nodes being defined between each series connected pair of transistors, each transistor of the plurality of transistors having a gate coupled to the second control node; and a plurality of capacitive components, one capacitive component being coupled between each intermediate node and the capacitive node, a voltage at the capacitive node being configured to be varied with a voltage at the second control node such that, at each intermediate node, the capacitive component is configured to accrue an opposite charge to the transistors.