Split RF Matching Network With On-Chip Tuning for Wideband Switching
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Solution Overview
Problem
Existing RF power amplifiers face challenges in achieving simultaneous good tunability, design flexibility, wide bandwidth, high efficiency, low loss, easy adjustability, and cost-effectiveness, while also requiring faster time-to-market due to limitations in current impedance matching network (IMN) architectures.
Innovation Solution
The architecture splits the final stage IMN into off-chip and on-chip components, with an on-chip tuner integrated close to the selector switch, allowing for tunability and flexibility across frequency bands, and enabling efficient impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed impedance matching network is used, then the circuit structure is simple, but the bandwidth is insufficient to cover the desired operating frequency range
Solution Approach 1:
The patent applies dynamics by making the impedance matching network tunable through variable capacitors that can be adjusted via control signals. This allows the matching network to adapt its characteristics dynamically across different frequency ranges, resolving the contradiction between simple fixed structure and wide bandwidth adaptability.
Solution Approach 2:
The patent changes the electrical parameters of the matching network by incorporating variable capacitors whose capacitance values can be modified through control signals. This enables the network to maintain optimal impedance matching across a wide frequency range, achieving both simplicity and versatility.
2Adaptability or versatility
If a wideband impedance matching network is designed, then the bandwidth is improved, but the performance at the edges of frequency bands deteriorates
Solution Approach 1:
The patent uses dynamically tunable capacitors controlled by control signals to adjust the matching network characteristics. This allows optimal performance to be maintained across the entire frequency range including band edges, rather than being fixed for a specific frequency point.
Solution Approach 2:
The patent segments the frequency operating range into multiple bands, with each band having optimized capacitor configurations. This segmentation allows the network to deliver high performance at frequency band edges while maintaining wide overall bandwidth coverage.
3Adaptability or versatility
If tunable components are added to improve bandwidth, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent implements a universal control mechanism where control signals simultaneously manage multiple variable capacitors in the matching network. This multi-functional approach allows a single control system to optimize the entire network across wide bandwidth, minimizing additional complexity while maximizing adaptability.
4Reliability
If more design parameters are considered, then the performance is improved, but the difficulty of synthesizing a fixed IMN increases
Solution Approach 1:
The patent transforms the difficult fixed-parameter synthesis problem into a dynamic parameter adjustment problem. By using variable capacitors controlled by external signals, the network can be tuned to satisfy multiple performance parameters simultaneously without requiring complex fixed circuit synthesis.
Data Source
AI summary
An improved architecture for a radio frequency (RF) power amplifier, impedance matching network, and selector switch. One aspect of embodiments of the invention is splitting the functionality of a final stage impedance matching network (IMN) into two parts, comprising a base set of off-chip IMN components and an on-chip IMN tuning component. The on-chip IMN tuning component may be a digitally tunable capacitor (DTC). In one embodiment, an integrated circuit having a power amplifier, an on-chip IMN tuner, and a selector switch is configured to be coupled to an off-chip set of IMN components. In another embodiment, an integrated circuit having an on-chip IMN tuner and a selector switch is configured to be coupled through an off-chip set of IMN components to a separate integrated circuit having an RF power amplifier.