Shared Mixer Receiver Layout to Minimize Band-Group Parasitic Load
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Solution Overview
Problem
Conventional receivers face performance issues due to parasitic loads when sharing mixers between band groups, leading to degraded signal quality and receiver performance.
Innovation Solution
A receiver design where each band group is coupled to a mixer via a switch, allowing only one band group to connect at a time, minimizing parasitic loads and improving signal quality by using capacitors to isolate bias voltages and optimize switch placement for better performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two band groups are coupled to the mixer input terminal via switches, then the mixer can be shared between band groups, but the parasitic load from the switches degrades the receiver performance
Solution Approach 1:
The invention divides the band selection mechanism into separate segments: one switch per band group, with each switch located at the output of its respective band group rather than at the mixer input. This segmentation isolates the parasitic load of each switch to its own band path, preventing the cumulative effect of multiple switches at the mixer input terminal.
Solution Approach 2:
The invention introduces individual switches as intermediary elements between each band group and the mixer. These switches act as mediators that enable band selection while isolating the parasitic effects to local paths rather than affecting the entire mixer input terminal.
2Object-affected harmful factors
If two band groups are directly connected to the mixer input terminal, then the parasitic load from switches is eliminated, but the parasitic load from both band groups accumulates at the mixer input
Solution Approach 1:
The invention segments the load management by placing individual switches at each band group output. This segmentation ensures that each band group's load is independently controlled and does not accumulate at the mixer input terminal, eliminating the need for complex co-design of band group loads.
3Device complexity
If a single switch is used at the mixer input to select between band groups, then the structure is simplified, but the parasitic load from the single switch affects both band groups simultaneously
Solution Approach 1:
The invention segments the switch placement so that each band group has its own switch located at its output. This segmentation ensures that the parasitic load of each switch only affects its own band path, not both band groups simultaneously, thereby improving signal quality while maintaining reasonable structural complexity.
Data Source
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AI summary
The present invention provides a receiver including a first band group, a second band group and a mixer. The first band group includes at least one LNA, wherein the first band group is configured to select one first LNA to receive a first input signal to generate an amplified first input signal. The second band group includes at least one LNA, wherein the second band group is configured to select one second LNA to receive a second input signal to generate an amplified second input signal. The first band group and the second band group are coupled to a first input terminal and a second input terminal of the mixer, respectively, and the mixer receives one of the amplified first input signal and the amplified second input signal to generate an output signal.