Tee-Filter RF Input Matching for Out-of-Band Blocker Rejection
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Solution Overview
Problem
Existing RF amplification circuits face challenges in efficiently amplifying wideband signals while rejecting interfering frequencies, particularly in high-frequency bands such as 5 GHz and 6 GHz, which can lead to amplifier saturation and signal distortion.
Innovation Solution
The implementation of a tee-filter configuration using a multi-tap spiral inductor and a notch filter, which provides wideband input matching and rejects interfering frequencies by resonating at specific center frequencies, thereby enhancing the input bandwidth and reducing circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RF amplification circuits are used to amplify wideband signals, then signal amplification is achieved, but interfering frequencies cause amplifier saturation and signal distortion
Solution Approach 1:
The patent segments the bandwidth into multiple narrower bands, each handled by a dedicated amplifier stage with its own input filter. This segmentation allows each amplifier to operate within a specific frequency range where it can maintain linearity and avoid saturation from out-of-band interferers, thereby improving overall signal quality while rejecting harmful frequencies through the filtered input paths.
2Object-affected harmful factors
If multiple amplifiers are used to handle different frequency bands, then interference rejection is improved, but device complexity increases
Solution Approach 1:
The patent employs dynamic band-selective switching that allows a single amplifier to be selectively tuned to different frequency bands based on the incoming signal requirements. This dynamic configuration enables the system to achieve multi-band interference rejection without permanently duplicating amplifier circuits, thereby reducing overall device complexity while maintaining the ability to reject interfering frequencies in each band.
3Object-affected harmful factors
If band-selective amplification is implemented, then interference rejection is improved, but input bandwidth is reduced
Solution Approach 1:
The patent designs amplifiers and input filters with multi-functional capabilities that allow a single amplifier stage to serve multiple frequency bands through selective activation. The universal amplifier architecture can be dynamically configured to amplify signals across different bands sequentially or simultaneously, maintaining wide overall input bandwidth while providing targeted interference rejection for each specific band through the multi-functional amplifier stages.
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 effectively amplifies wideband RF signals exceeding 1.5 GHz while minimizing the impact of interfering frequencies, thereby preventing amplifier saturation and improving signal quality and throughput in wireless communication systems.
Implementation Method 1
a notch filter, which provides wideband input matching and rejects interfering frequencies by resonating at specific center frequencies
Implementation Method 2
The implementation of a tee-filter configuration using a multi-tap spiral inductor and a notch filter, which provides wideband input matching
Data Source
AI summary
Wide-band matching in out-of-band blocker rejection filters is provided. A device includes a first inductor. The device includes a second inductor magnetically coupled with the first inductor and with an amplifier. The device includes a notch filter electrically coupled between the first inductor and the second inductor. The amplifier can be configured to amplify a plurality of radio frequency signals. A bandwidth of the radio frequency signals can exceed 1.5 gigahertz (GHz).