RF Switch Gate Bypass Circuit for Faster State Transitions
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Solution Overview
Problem
The increasing complexity of radio frequency front-end (RFFE) modules has made it challenging to reduce the switching time of RF switches, including antenna switches, which is critical for performance.
Innovation Solution
The solution involves selectively bypassing certain circuit elements, such as gate resistors and capacitors, during the transition of RF switches from one state to another, thereby reducing the overall RC time constants and improving switching time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If circuit elements (gate resistors and capacitors) are bypassed during switching transition, then switching time is reduced, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-charging capacitors with bias voltages before the switching transition occurs. This prepares the circuit elements in advance so that when the switching transition is initiated, the capacitors are already charged and ready to be switched, eliminating the need for slow charging during the transition itself. This reduces the overall switching time while maintaining a manageable device complexity through systematic pre-preparation of circuit states.
Solution Approach 2:
The patent implements dynamics by making the circuit configuration changeable during operation. Switches are introduced that can dynamically connect or disconnect capacitors and gate resistors based on the switching state. This dynamic reconfiguration allows the circuit to optimize its performance for different operating conditions (switching vs. steady state), achieving faster switching times when needed while maintaining stability during normal operation.
2Productivity
If multiple capacitors are used for bias voltage storage, then switching performance is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the single capacitor function into multiple separate capacitors, each dedicated to storing bias voltage for specific transistors or circuit sections. This segmentation allows independent optimization of each capacitor's value and timing, enabling precise control over the switching transition of individual components. The modular approach improves switching performance through better-controlled transitions while making the overall system more manageable despite the increased number of components.
Solution Approach 2:
The patent implements multi-functionality by designing capacitors that serve dual purposes: storing bias voltages for transistor gates and acting as charge transfer elements during switching transitions. The same capacitors that maintain the biased state of transistors also provide the charge necessary for rapid switching when activated. This multi-functional design improves switching performance without requiring entirely separate capacitor networks for each 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
This approach effectively reduces the switching time of RF switches by up to 70% in some embodiments, enhancing the performance of RFFE modules.
Implementation Method 1
a capacitor coupling the first terminal to ground
Implementation Method 2
a capacitor with a first capacitor terminal and a second capacitor terminal, the capacitor being a pre-charged capacitor
Data Source
AI summary
Methods and devices to reduce the switching time of radio frequency (RF) switches including antenna switches are disclosed. The disclosed teachings include selective bypassing of the capacitive and resistive elements of the circuit during the transition of RF switches from one state to another. Several implementations of the disclosed methods and devices are also presented.