RF Receiver Filter Bypass Using SNR Feedback
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Solution Overview
Problem
Mobile devices' RF receivers consume significant power due to the channel selection filter's operation, which is inefficient in terms of power management, especially when the communication environment is good.
Innovation Solution
A method involving a transimpedance amplifier, a capacitor selectively connected in parallel, a channel selection filter unit, and a variable gain amplification unit, where the capacitor is disconnected and the channel selection filter is bypassed when the signal-to-noise ratio is above a threshold, and reconnected when the ratio falls below the threshold, to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the channel selection filter operates continuously to filter interference and noise, then signal quality is improved, but power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the channel selection filter's operation state changeable between active and bypassed states based on communication environment conditions. The filter is dynamically activated when signal-to-noise ratio falls below a threshold and bypassed when the ratio exceeds the threshold, allowing the system to adapt its power consumption to actual needs while maintaining signal quality when necessary.
2Use of energy by moving object
If the channel selection filter is bypassed to reduce power consumption, then power efficiency is improved, but signal filtering capability deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the signal-to-noise ratio and using this information to control the channel selection filter's operation state. The measured signal-to-noise ratio is fed back to the control logic, which adjusts the filter's activation status accordingly, ensuring that filtering capability is maintained when signal quality degrades while allowing power savings when conditions are good.
3Reliability
If the capacitor is connected in parallel with the transimpedance amplifier, then signal processing performance is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the capacitor's connection state changeable based on communication environment assessment. The capacitor is connected in parallel with the transimpedance amplifier when signal-to-noise ratio indicates good conditions, and disconnected when conditions deteriorate, allowing the system to optimize between performance and power consumption dynamically.
Data Source
AI summary
A method is provided for operating a radio frequency (RF) receiver including a transimpedance amplifier, a capacitor selectively connected in parallel with the transimpedance amplifier, a channel selection filter unit connected to an output terminal of the transimpedance amplifier, and a variable gain amplification unit selectively connected in parallel with the channel selection filter unit. The method includes measuring signal-to-noise ratio from an output of the RF receiver, and comparing the measured signal-to-noise ratio with a reference signal-to-noise ratio. When the measured signal-to-noise ratio is greater than the reference signal-to-noise ratio, the capacitor is electrically disconnected from being connected in parallel with the transimpedance amplifier and a variation in the measured signal-to-noise ratio is measured. When the measured variation is in tolerance, the channel selection filter is bypassed to select the variable gain amplification unit.