Wireless Receiver Attenuation Override for RF Overvoltage Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless transceivers face reliability issues due to high voltage signals causing saturation and potential damage, especially when the automatic gain controller (AGC) cannot adjust the gain quickly enough or when signals exceed the voltage capacity of components like digital step attenuators (DSAs).
Innovation Solution
A technique that determines a relative reliability threshold based on the present attenuation level, compares the voltage level of received RF signals to this threshold, and overrides the attenuation setting to prevent damage, using a reliability detector module and override value module to adjust the gain dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the AGC adjusts the gain to receive low voltage signals, then the receiver can detect weak signals, but the DSA may be damaged when high voltage signals are received
Solution Approach 1:
The system performs preliminary detection of the received signal voltage level before the DSA processes the signal. By detecting the voltage level in advance and comparing it to a threshold, the system can preemptively prevent high voltage signals from reaching the DSA, thus avoiding damage while allowing low voltage signals to pass through for processing
Solution Approach 2:
The voltage detector and controller act as intermediary components between the received signal and the DSA. The detector monitors the voltage level and the controller adjusts the DSA attenuation setting based on this monitoring, creating a protective intermediary layer that prevents harmful high voltage signals from reaching the vulnerable DSA component
2Reliability
If the AGC reduces the gain to prevent DSA damage, then component reliability is improved, but the ability to receive low voltage signals is reduced
Solution Approach 1:
The system dynamically adjusts the DSA attenuation setting based on the real-time voltage level of the received signal. When the voltage is low, the DSA maintains low attenuation to preserve sensitivity for weak signal reception. When the voltage exceeds the threshold, the system dynamically increases attenuation to protect the DSA, thus adapting the protection level to the actual signal conditions
3Speed
If the AGC adjusts gain quickly to prevent damage, then response time is improved, but system complexity increases
Solution Approach 1:
The voltage detection and threshold comparison are performed in advance before the signal reaches the DSA. This preliminary action allows the system to prepare the appropriate attenuation setting proactively, enabling rapid response to high voltage conditions without requiring complex real-time adjustment mechanisms during signal processing
Data Source
AI summary
Techniques maintaining receiver reliability, including determining a present attenuation level for an attenuator, wherein the attenuation level is set by a gain controller, determining a relative reliability threshold based on the present attenuation level, receiving a radio frequency (RF) signal, determining a voltage level of the received RF signal, comparing the voltage level of the received RF signal to the relative reliability threshold to determine that a reliability condition exists, and overriding, in response to the determination that the reliability condition exists, the present attenuation level set by the gain controller with an override attenuation level based on the present attenuation level.