GNSS Receiving Module With Switchable Front and Rear Filtering
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Solution Overview
Problem
Existing GNSS receivers face limited application scenarios due to the need for discrete or integrated filters that occupy significant space and are not adaptable to devices with or without cellular communication functions, limiting their flexibility and miniaturization.
Innovation Solution
A receiving module with a dual-mode amplifying unit and filtering unit that can switch between front and rear filtering modes, allowing the same module to be used in devices with or without cellular communication, by controlling the flow direction of signals through transistors and switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discrete filter is provided at the input end of the LNA to suppress out-of-band interference, then the LNA can be protected from blocking due to high-power signals, but the device occupies a relatively large space
Solution Approach 1:
The patent combines the filter and LNA into a single integrated device, where the filter is formed within the same package as the LNA. This merging reduces the overall space occupied while maintaining the protective filtering function against high-power signal blocking
Solution Approach 2:
The integrated filter-LNA device can function in multiple modes: as a front filter when cellular communication is enabled, and as a rear filter or simple LNA when cellular communication is disabled. This multi-functionality allows a single device to replace what would traditionally require separate components
2Area of stationary object
If the filter is integrated with the LNA to reduce space occupied by the device, then the packaging area is reduced, but the filter is applicable as either a front application or a rear application, therefore application scenarios are relatively limited
Solution Approach 1:
The patent introduces a switching mechanism that dynamically changes the operating mode of the integrated device based on whether cellular communication function is enabled. The filter can switch between front-filter mode, rear-filter mode, or being bypassed entirely, allowing the same integrated structure to adapt to different application scenarios and maintain versatility
Data Source
AI summary
This application provides a receiving module, a packaging structure, a printed circuit board, and an electronic device, which can mitigate a problem that application scenarios of a front-end receiving module of an existing GNSS receiver are limited. The receiving module includes a first filtering unit, an amplifying unit, and a control element. When the amplifying unit operates in a first mode, the first end of the amplifying unit acts as a signal input end, and in this way, the first filtering unit acts as a front filtering unit. When the amplifying unit operates in a second mode, the first end of the amplifying unit acts as a signal output end, and in this way, the first filtering unit acts as a rear filtering unit.