Consolidated Acoustic Transformer for Low-Loss Multi-Band RF Filtering
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Solution Overview
Problem
Existing transmitter chains in mobile communication devices face challenges in achieving proper amplification and filtering of RF signals, particularly in managing impedance mismatch and out-of-band rejection, which often result in increased insertion loss and complexity.
Innovation Solution
Incorporating a consolidated acoustic transformer and tunable ferroelectric network elements in the transmitter chain, which converts differential signals to single-ended signals and uses negative capacitance for enhanced out-of-band rejection, allowing for reduced insertion loss and flexible filter design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional transformers and filters are used in the transmitter chain, then impedance matching and signal filtering can be achieved, but insertion loss increases and design flexibility decreases
Solution Approach 1:
The patent combines the transformer and filter into a single integrated acoustic device. The acoustic transformer includes input electrodes, output electrodes, and acoustic wave resonators that simultaneously perform impedance transformation and signal filtering functions, eliminating the need for separate transformer and filter components.
Solution Approach 2:
The acoustic transformer is designed to perform multiple functions: impedance transformation between differential and single-ended signals, frequency filtering, and signal coupling. This multi-functional design reduces the overall component count and simplifies the transmitter chain architecture.
2Adaptability or versatility
If multiple transformer-filter pairs are used for multi-band operation, then frequency flexibility is improved, but device complexity and insertion loss increase
Solution Approach 1:
The patent implements tunable ferroelectric network elements within the acoustic transformer that allow dynamic adjustment of the operating frequency. This enables a single transformer-filter pair to operate across multiple frequency bands by electronically tuning the resonant frequency, eliminating the need for multiple fixed-frequency pairs.
Solution Approach 2:
The acoustic transformer uses variable capacitance elements and tunable resonators that can change their electrical parameters to adapt to different frequency bands. This allows the same physical structure to serve multiple frequency ranges by modifying its electrical characteristics rather than using separate hardware for each band.
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 improves impedance matching and out-of-band rejection, reducing insertion loss and enabling more efficient filter design with greater flexibility across multiple bands.
Implementation Method 1
an acoustic transformer coupled to an acoustic filter. The acoustic transformer provides a single-ended output signal
Implementation Method 2
an acoustic filter comprising a tunable ferroelectric network element
Data Source
AI summary
An acoustic transformer in a transmitter chain is disclosed. In one aspect, a differential power amplifier may produce a differential signal that is provided to an acoustic transformer coupled to an acoustic filter. The acoustic transformer provides a single-ended output signal for use by the acoustic filter. To facilitate operation in multiple bands, multiple acoustic transformer-acoustic filter pairs may be provided with a switching network used to route the amplified signal to the appropriate transformer-filter pair.