RF Filter Switch Gate Width Layout for Power Durability
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Solution Overview
Problem
Conventional radio-frequency filters with frequency-tunable functions face challenges in achieving power durability, particularly in multiband systems, where reducing switch element size and loss are prioritized, but configurations that improve power durability are not well-examined, leading to trade-offs with size reduction and insertion loss.
Innovation Solution
A radio-frequency filter design that includes a series-arm circuit and two parallel-arm circuits connected to ground, each with a resonator and a switch circuit containing transistors, where the gate width of transistors in the first switch element is greater than those in the second, ensuring higher current withstand capability while reducing the overall size and insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate width of transistors in the first switch element is increased to improve current withstand capability and power durability, then the size of the switch element increases, but this contradicts the goal of reducing overall filter size
Solution Approach 1:
The patent applies different gate widths to transistors in different switch elements based on their specific requirements. The first switch element (closer to input terminal) has transistors with greater gate width to handle higher current, while the second switch element has transistors with smaller gate width. This local differentiation optimizes both power durability and size reduction.
Solution Approach 2:
The filter is divided into multiple parallel-arm circuits with different switch elements, each having transistors with differently sized gate widths. This segmentation allows each switch element to be independently optimized for its specific current handling requirements, resolving the contradiction between overall size reduction and local power durability.
2Loss of energy
If larger gate width transistors are used to improve power durability and reduce on-resistance, then passband insertion loss decreases, but the device complexity and manufacturing precision requirements increase
Solution Approach 1:
Different gate width configurations are applied to different switch elements based on their position and current requirements. The first switch element uses larger gate width transistors to minimize insertion loss where current is highest, while other switch elements use smaller gate widths, optimizing the overall loss-performance balance without uniformly increasing complexity.
Solution Approach 2:
The patent changes the gate width parameter of transistors in different switch elements to optimize performance. By adjusting this critical parameter locally rather than uniformly, the patent achieves reduced insertion loss in critical paths while maintaining manageable device complexity through selective parameter optimization.
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 design ensures power durability for radio-frequency filters with frequency-tunable functions while reducing size and passband insertion loss, allowing for fine adjustment of attenuation pole frequencies and number of poles.
Implementation Method 1
a first switch element that includes one or more transistors; and a second switch element that includes one or more transistors
Data Source
AI summary
A filter includes: a series-arm circuit; a first parallel-arm circuit connected to a node and a ground; and a second parallel-arm circuit connected to a node and the ground. The first parallel-arm circuit includes a first parallel-arm resonator, and a first switch circuit connected in series to the first parallel-arm resonator. The second parallel-arm circuit includes a second parallel-arm resonator, and a second switch circuit connected in series to the second parallel-arm resonator. The first switch circuit includes a first switch element that includes one or more transistors. The second switch circuit includes a second switch element that includes one or more transistors. A gate width of each of the one or more transistors included in the first switch element is greater than a gate width of at least one of the one or more transistors included in the second switch element.