RF Circuit Filter Layout for Triple Beat Distortion Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Triple beat distortion occurs when two component carriers (CCs) in a first band and one CC in a second band are simultaneously transferred, leading to deterioration of reception sensitivity due to overlapping frequency components entering the reception path.
Innovation Solution
A radio frequency circuit design that includes specific power amplifiers, low-noise amplifiers, switches, and filters connected in a manner that attenuates and isolates triple beat distortion components, ensuring high isolation between transmission and reception paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two CCs in the first band and one CC in the second band are simultaneously transferred, then bandwidth utilization is improved, but triple beat distortion occurs causing reception sensitivity deterioration
Solution Approach 1:
The patent divides the RF circuit into separate transmission and reception paths with dedicated filters for each band. The first filter handles the first band (Band 40/41) and the second filter handles the second band (Band 1/3), preventing interference between simultaneous transmissions and receptions in different bands.
Solution Approach 2:
The patent introduces filters as intermediary components between the power amplifiers and low-noise amplifiers. These filters act as mediators that selectively pass desired frequencies while blocking unwanted triple beat distortion components, enabling simultaneous multi-band operation without mutual interference.
2Reliability
If filters are added to attenuate triple beat distortion, then reception sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent designs filters that serve multiple functions: they attenuate triple beat distortion components, pass desired signal frequencies, and provide band separation. The first filter (for Band 40/41) and second filter (for Band 1/3) each perform multiple roles in managing interference and maintaining signal integrity across different operational modes.
Solution Approach 2:
The patent applies different filter characteristics to different bands based on their specific requirements. The first filter is optimized for Band 40/41 operations while the second filter is optimized for Band 1/3 operations, allowing each filter to address the specific distortion issues of its designated band with tailored performance characteristics.
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 design reduces deterioration of reception sensitivity by effectively attenuating and isolating triple beat distortion, maintaining high reception sensitivity even when three signals in two bands are simultaneously transferred.
Implementation Method 1
a first filter having a passband that includes at least a portion of a first band
Implementation Method 2
a second filter having a passband that includes at least a portion of a second band
Implementation Method 3
a third filter having a passband that includes a third band for time division duplex; and a fourth filter having a passband that includes the third band
Implementation Method 4
a first power amplifier; a second power amplifier
Implementation Method 5
a first low-noise amplifier
Data Source
AI summary
A radio frequency circuit includes: first and second power amplifiers; a low-noise amplifier; first and second switches; a first filter for a first band; a second filter for a second band; and third and fourth filters for a third band for time division duplex. Triple beat distortion that occurs due to two signals in the first band and a signal in the second band overlaps the third band. The first filter is connected between the first power amplifier and the second switch, the second power amplifier is connected to the first switch, the second filter is connected between the first and second switches, the third filter is connected between the first and second switches, and the fourth filter is connected between the low-noise amplifier and the second switch.