RF Front End Circuit Noise Suppression via Coupling Module
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Solution Overview
Problem
Existing MIMO RF front end circuits face increased costs due to the need for additional noise suppression circuits to handle narrow band interference and jamming noise, which affects communication quality.
Innovation Solution
A RF front end circuit with a processor-controlled architecture that includes a main path, an adjustment path, and a coupling module, allowing for switching between normal and adjustment modes to suppress noise by coupling adjustment signals to the main path, utilizing components like low-noise amplifiers, attenuators, synthesizers, and digital signal processing modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extra noise suppression circuit is added to each receiving path, then noise suppression capability is improved, but device cost increases
Solution Approach 1:
The patent combines the noise suppression function with the existing receiving path by introducing a coupling module that merges the adjustment path signal with the main receiving path signal. Instead of adding a completely separate noise suppression circuit, the system utilizes the existing receiving path infrastructure while injecting noise cancellation signals through the coupling module, thereby reducing overall device complexity and cost.
Solution Approach 2:
The receiving path is designed to serve multiple functions: it simultaneously handles normal signal reception and noise suppression operations. The coupling module enables the same receiving path to function in both modes by selectively combining signals, eliminating the need for dedicated separate noise suppression circuits for each receiving path.
2Reliability
If a noise suppression circuit with detector and filter is added, then communication quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the noise suppression functionality into the existing receiving path architecture. The coupling module combines the adjustment path (which contains noise suppression signals) with the main receiving path, allowing the same physical circuit to perform both signal reception and noise suppression without requiring entirely separate detector and filter circuits for each function.
Solution Approach 2:
The system dynamically switches between normal reception mode and noise suppression mode using controllable coupling switches. The coupling module can selectively connect or disconnect the adjustment path signal with the main receiving path signal based on operational requirements, enabling the circuit to adapt its function dynamically rather than requiring fixed separate circuits for each mode.
Data Source
AI summary
A RF front end circuit includes a processor, a main receiving (Rx) path and an adjustment path connected between the processor and an external antenna array in parallel, and a coupling module coupled with the main Rx path. The adjustment path includes an adjustment transmitting (Tx) path, an adjustment Rx path, and a DSP. The adjustment Tx path includes a coupling switch. When the circuit operates in an adjustment mode, the switch is connected to the coupling module, the adjustment Rx path receives and demodulates a first analog signal, the DSP converts the first analog signal to a digital signal, clipping a peak of the digital signal, and converts the digital signal to a second analog signal, the adjustment Tx path modulates and reverses the phase of the second analog signal, and the coupling module couples the second analog signal to the main Rx path to counteract noise received thereby.