Serial Capacitance Tuner for Impedance Matching
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Solution Overview
Problem
Current impedance matching networks in mobile communication systems face challenges in accommodating a wide frequency spectrum and varying environmental conditions, leading to size limitations and significant losses due to the use of external components and multiple states.
Innovation Solution
A serial capacitive tuner with a series capacitor topology, utilizing a variable capacitive element comprising a stack of series-connected transistors and MIM/Metal to Metal capacitors, which eliminates external components and allows for integrated, cost-effective, and low-loss impedance matching by adjusting capacitance based on control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external components and multiple states are used in impedance matching networks, then impedance matching capability is improved, but device size and cost increase
Solution Approach 1:
The patent merges multiple impedance matching functions into a single integrated capacitor structure. The series capacitor topology combines multiple capacitive elements (C1, C2, C3) and switching elements (S1, S2, S3) into one unified component that provides multiple impedance states, eliminating the need for separate external components and reducing overall device size while maintaining full adaptability.
Solution Approach 2:
The integrated capacitor serves multiple functions simultaneously: it provides impedance matching across wide frequency spectra, supports multiple tuning states through different capacitance combinations, and replaces what would traditionally require separate external components. This multi-functionality achieves full adaptability without proportionally increasing device size.
2Adaptability or versatility
If external components are used in impedance matching networks, then impedance matching is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple passive components (capacitors C1, C2, C3) and switching elements (S1, S2, S3) into a single integrated capacitor structure that can be manufactured as one unit using standard semiconductor fabrication processes. This integration eliminates the need to source, test, and assemble multiple separate external components, significantly reducing manufacturing complexity and cost while maintaining full impedance matching capability.
Solution Approach 2:
The integrated capacitor structure is self-contained and requires no external components or additional assembly steps. All impedance matching functionality is embedded within the single component, making it a plug-and-play solution that simplifies manufacturing workflows and reduces assembly costs.
3Adaptability or versatility
If traditional impedance matching networks are used, then impedance matching is achieved, but power loss increases
Solution Approach 1:
The series capacitor topology with integrated switching elements minimizes the number of discrete components and interconnections, reducing parasitic resistances and energy losses at each interface. By combining multiple functions into fewer integrated elements, the patent reduces cumulative power loss while maintaining full adaptability across frequency spectra and impedance conditions.
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 solution reduces the size and cost of the impedance matching network, enhances Q factors, and supports multiple tuning states without significant size increase, while minimizing power loss and accommodating various impedance settings.
Implementation Method 1
a variable capacitive element comprising a plurality of capacitive elements in series. At least one of the plurality of capacitive elements comprises a switch element comprising a stack of series connected transistors and a combination of the off-capacitances of the transistors provide a capacitance of the capacitive element comprising the switch element
Implementation Method 2
The antenna matching network is designed to improve power transfer between the transceiver and the antenna by matching the impedance of the transceiver to the impedance of the antenna's feed line
Data Source
AI summary
An impedance matching network comprises a first signal terminal configured to receive a signal from a source circuit and a second signal terminal configured to provide the signal to a load circuit. The network further comprises a series branch comprising a variable capacitive component between the first signal terminal and the second signal terminal. The variable capacitive component comprises a plurality of capacitive portions connected in series, wherein at least one of the capacitive portions comprises a switching element comprising a stack of series connected transistors. The impedance matching network also comprises a control component configured to control a capacitance of the variable capacitive component by controlling the at least one of the capacitive portions based on a predetermined algorithm.