Dynamic Amplifier Linearity Control for Receiver Interference
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Solution Overview
Problem
Electronic devices with wireless communications circuitry face challenges in mitigating radio-frequency interference, which can adversely affect the performance of sensitive wireless receivers due to overlapping communication bands and noise sources.
Innovation Solution
The implementation of adjustable-linearity amplifiers in electronic devices, controlled by control circuitry that analyzes transmit frequencies and powers to dynamically adjust the amplifier's linearity, increasing it when interference is detected to reduce noise and conserve power when interference is not present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the linearity of the amplifier is increased to reduce interference, then the receiver performance is improved, but the power consumption increases
Solution Approach 1:
The amplifier's linearity is made dynamically adjustable rather than fixed. The control circuitry changes the amplifier's operating mode based on real-time detection of transmit signals, allowing the system to optimize between linearity and power consumption depending on interference conditions.
Solution Approach 2:
The physical parameter of amplifier linearity is changed based on operational conditions. The control circuitry detects transmit frequencies and powers, then adjusts the amplifier's linearity parameter accordingly - increasing linearity when interference is detected and reducing it when no interference is present.
2Object-affected harmful factors
If the linearity of the amplifier is increased to minimize mixing products, then the interference is reduced, but the power consumption increases
Solution Approach 1:
The harmful mixing products are extracted or eliminated by adjusting the amplifier's linearity. The control circuitry detects when transmit frequencies create potential interference and increases linearity specifically to eliminate the mixing products that would otherwise fall into the receive band.
Solution Approach 2:
The system uses feedback from the control circuitry that continuously monitors transmit frequencies and powers. This feedback loop allows the amplifier linearity to be adjusted in response to actual interference conditions, eliminating mixing products only when necessary rather than operating at high linearity continuously.
3Reliability
If the amplifier operates at high linearity continuously, then the receiver performance is maintained, but the power consumption increases
Solution Approach 1:
Instead of continuous high linearity operation, the system employs periodic detection and adjustment. The control circuitry periodically checks for transmit signals and adjusts amplifier linearity only when needed, creating a rhythm of high and low linearity states that reduces average power consumption while maintaining performance when required.
Data Source
AI summary
An electronic device may include antenna structures. Wireless transmitter circuitry such as cellular telephone transmitter circuitry and wireless local area network circuitry may transmit signals using the antenna structures. A wireless receiver may receive signals from the antenna structures through an adjustable-linearity amplifier. The wireless receiver may operate in a receive band such as a satellite navigation system receive band. During operation of the electronic device, control circuitry in the device may analyze the frequencies and powers of the transmitted signals to determine whether there is a potential for interference for the receive band to be generated in the adjustable-linearity amplifier. In response to determining that there is a potential for interference, the control circuitry may increase the linearity of the adjustable-linearity amplifier.