RF Receiver Blocking Module Oscillation Interference
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Solution Overview
Problem
Radio frequency transceivers face interference issues due to significant differences in signal strength between transmitted and received signals, leading to susceptibility of receivers to interference from the transmitted signal, which existing blocking circuits struggle to effectively attenuate.
Innovation Solution
A blocking module that generates an oscillation corresponding to the frequency of the blocking signal and filters the amplified inbound RF signal to substantially attenuate the blocking signal component while passing the desired RF signal component, using a combination of low noise amplifiers and a subtraction module to isolate the desired signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a duplexer is used to block interference from transmitted signal to receiver, then isolation between transmitter and receiver is improved (50-60 dB), but the inductors and capacitors required are large and must be implemented off-chip, increasing device complexity and size
Solution Approach 1:
The patent extracts the blocking function from the traditional duplexer architecture and implements it as a separate blocking circuit with adjustable attenuation. This allows the blocking function to be integrated on-chip while maintaining effective interference rejection, eliminating the need for large off-chip inductors and capacitors.
Solution Approach 2:
The patent employs an adjustable attenuation mechanism that can dynamically change the blocking level based on operating conditions. By varying attenuation parameters, the system can adapt to different interference levels and frequency conditions, providing effective blocking without requiring fixed large passive components.
2Object-affected harmful factors
If traditional blocking circuits are used to attenuate blocking signal, then interference reduction is achieved, but the circuits have issues locking on to the blocking signal, reducing reliability
Solution Approach 1:
The patent implements a feedback mechanism where the blocking circuit continuously monitors the received signal to identify and lock onto the blocking signal characteristics. This feedback loop ensures reliable tracking of the blocking signal even when its characteristics change, maintaining effective interference rejection throughout operation.
Solution Approach 2:
The blocking circuit is designed with dynamic adjustment capabilities that allow it to adapt to changing blocking signal conditions. The circuit can dynamically adjust its blocking characteristics to maintain optimal performance, ensuring reliable operation under varying interference conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces interference by locking onto and attenuating the blocking signal, improving the signal-to-noise ratio and reducing unwanted signal contamination in radio frequency transceivers.
Implementation Method 1
A blocking module that generates an oscillation corresponding to the frequency of the blocking signal and filters the amplified inbound RF signal
Implementation Method 2
filters the amplified inbound RF signal to substantially attenuate the blocking signal component while passing the desired RF signal component
Implementation Method 3
The low noise amplifier receives inbound RF signals via the antenna and amplifies then
Implementation Method 4
using a combination of low noise amplifiers and a subtraction module to isolate the desired signal
Data Source
AI summary
A radio frequency (RF) receiver includes an amplifier stage, a blocking module, and a down conversion module. The amplifier stage amplifies an inbound RF signal (includes a desired component and a blocking component) to produce an amplified inbound RF signal. The blocking module generates an oscillation corresponding to a frequency of the blocking component and filters the amplified inbound RF signal based on the oscillation to substantially attenuate the blocking component and to pass, substantially unattenuated, the desired component. The down conversion module converts the desired RF signal component into a baseband or near baseband inbound signal.