Band-Shared Receiver Mixer Inputs to Isolate Parasitic Loads

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Solution Overview

Problem

Conventional receivers face performance issues due to parasitic loads when sharing mixers between band groups, leading to suboptimal signal quality and performance.

Innovation Solution

A receiver design where each band group is coupled to a mixer via a switch and capacitor, ensuring each signal path experiences only its own parasitic load, thereby improving signal quality and reducing interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If two band groups are coupled to an input terminal of the mixer via switches, then mixer sharing between band groups is achieved, but the input terminal of the mixer experiences additional parasitic load from the switches

Engineering Contradiction:

Improvemixer sharing capabilityVSAvoidparasitic load at mixer input terminal

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the single mixer input terminal into two separate input terminals, allowing each band group to connect to its own dedicated terminal. This segmentation eliminates the accumulation of parasitic loads from multiple switches at a single terminal, while still enabling mixer sharing between band groups through the switched LNA connections.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If two band groups are directly connected to the input terminal of the mixer, then the structure is simplified, but the input terminal of the mixer experiences parasitic load from both band groups causing worse receiver performance

Engineering Contradiction:

Improveconnection structureVSAvoidreceiver performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent segments the mixer input terminal into two separate terminals, with each band group connecting to its own terminal. This maintains relatively simple structure while eliminating the parasitic load accumulation problem, thereby preserving receiver performance without requiring complex additional components.

Inventive Principle:

Principle #1Segmentation

3Area of stationary object

If a single mixer is shared by two band groups, then chip area is reduced, but the mixer input terminal experiences increased parasitic load

Engineering Contradiction:

Improvechip areaVSAvoidparasitic load at mixer input terminal

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent segments the mixer input terminal into two separate terminals, allowing each band group to have its own dedicated connection point. This maintains the chip area savings from mixer sharing while eliminating the parasitic load accumulation that would otherwise occur at a shared terminal.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10756686B2Band sharing technique of receiver

Publication Date: 2020.08.25 MEDIATEK INC

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.