Variable Capacitance Integrated Circuit With Slotted Middle Plate
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Solution Overview
Problem
Existing integrated circuits face challenges in miniaturization due to the space-consuming nature of discrete capacitors, which are required to handle various frequency ranges in wireless communication technologies, necessitating an improved variable capacitance circuit for smaller, more portable electronic devices.
Innovation Solution
A variable capacitance integrated circuit design featuring elongated plates with slots and dielectric layers, along with a switching circuit that selects between middle and bottom plates to achieve different capacitance values, allowing for reduced space usage and multiple capacitance settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If discrete capacitors are used to handle various frequency ranges, then the circuit can achieve multiple capacitance values, but the circuit consumes valuable real estate and increases device size
Solution Approach 1:
The patent merges multiple capacitor functions into a single integrated structure with three plates (top, middle, bottom) that can form multiple capacitance values. The middle plate can be selectively connected to different plates to create variable capacitance, eliminating the need for multiple discrete capacitors and reducing the area required on the integrated circuit.
Solution Approach 2:
The patent implements dynamic capacitance selection through switching circuits that can connect the middle plate to either the top or bottom plate based on control signals. This dynamic reconfiguration allows the same physical structure to provide multiple capacitance values, achieving adaptability without increasing device area.
2Adaptability or versatility
If the middle plate is made solid, then the structure is simpler, but the electric field cannot penetrate through to the bottom plate, limiting capacitance options
Solution Approach 1:
The patent uses a slotted middle plate structure where slots allow electric field penetration through the middle plate to the bottom plate. This slotting creates a porous-like structure that enables the middle plate to serve dual purposes: maintaining structural integrity while allowing electric field passage for capacitance selection between different plate combinations.
3Volume of moving object
If smaller integrated circuits are fabricated, then portable electronic devices can be made smaller, but discrete capacitors consume valuable real estate
Solution Approach 1:
The patent combines multiple capacitor functions into a single integrated structure with three plates that can provide multiple capacitance values through selective connection. This merging approach dramatically reduces the total area required for capacitive elements on the integrated circuit, enabling smaller device fabrication while maintaining the needed capacitance options for wireless communication technologies.
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 enables compact integrated circuits capable of handling various frequency ranges by providing multiple capacitance values with reduced spatial requirements, enhancing the design efficiency for smaller electronic devices.
Implementation Method 1
a capacitor comprising: an elongated top plate; an elongated middle plate disposed below the top plate, wherein the middle plate comprises a plurality of slots and a plurality of plate strips; an elongated bottom plate disposed below the middle plate; and a dielectric layer disposed between each plate
Data Source
AI summary
A variable capacitance semiconductor structure is disclosed. Embodiments include a capacitor having three plates, a top plate, a middle plate, and a bottom plate. The top plate serves as a positive plate. The middle and bottom plates serve as ground plates for the capacitor. A switching circuit selects between the middle plate and the bottom plate for use as the ground plate of the capacitor. The middle plate is slotted, allowing electric fields to penetrate through the middle plate to the bottom plate. The slots prevent the electric fields from terminating at the middle plate. A different capacitance value can be selected, depending on whether the middle plate or bottom plate is selected as the ground plate. Logic circuitry is configured to control the selection of plates to achieve a variety of capacitance values.