PA Impedance Tuning for Harmonic Interference Suppression
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Solution Overview
Problem
Existing electronic devices in wireless communication systems face challenges in effectively removing harmonic components that cause interference to other frequency bands, as conventional notch filters alone are insufficient, and reducing transmit power to mitigate this interference leads to performance degradation in the service frequency band.
Innovation Solution
The implementation of an electronic device with a Power Amplifier (PA) and an impedance tuner, where the impedance tuner can be controlled by a processor to switch between different impedance states, coupled with notch filters at the input and output stages of the PA, to manage harmonic output levels and minimize interference across frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a notch filter is used to remove harmonic components, then interference to other frequency bands is reduced, but the filter alone cannot sufficiently remove the interference
Solution Approach 1:
The patent combines a notch filter with an impedance tuner to create a composite solution. The notch filter removes harmonic components at the PA output, while the impedance tuner adjusts the antenna impedance to reduce harmonic generation at the source. This merging of two different mechanisms achieves superior interference removal compared to either component alone.
Solution Approach 2:
The impedance tuner acts as an intermediary component between the Power Amplifier and the antenna. By adjusting the impedance matching, it mediates the harmonic signal transmission, reducing the amplitude of harmonic components before they reach the antenna and potentially causing interference to other bands.
2Object-affected harmful factors
If transmit power is decreased to reduce harmonic interference, then interference to other frequency bands is reduced, but performance in the service frequency band deteriorates
Solution Approach 1:
The impedance tuner applies localized impedance adjustment specifically针对 the harmonic frequency components while maintaining proper impedance matching for the service frequency band. This allows the system to selectively reduce harmonic interference without compromising the transmit power and performance in the intended service band.
Solution Approach 2:
The system dynamically changes the impedance parameters of the tuner based on operating conditions. By adjusting impedance values, the system can optimize harmonic suppression while maintaining service band performance, avoiding the need to reduce overall transmit power.
3Object-affected harmful factors
If the impedance tuner is adjusted to reduce harmonic output, then interference to other frequency bands is reduced, but the device complexity increases
Solution Approach 1:
The impedance tuner serves multiple functions: it provides impedance matching for maximum power transfer to the antenna and simultaneously acts as a harmonic suppressor by adjusting impedance at harmonic frequencies. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The impedance tuner dynamically adjusts its impedance values based on operating conditions and frequency content. This dynamic adjustment allows a single component to adaptively suppress harmonics across different operating scenarios without requiring multiple fixed-value components or complex switching mechanisms.
Data Source
AI summary
According to various embodiments, an electronic device in a wireless communication system may include a Power Amplifier (PA) for a first frequency band, a Low Noise Amplifier (LNA) for a second frequency band at least partially overlapping a frequency band which is twice the first frequency band, and an impedance tuner which is in a first impedance state or a second impedance state under the control of the processor. The PA and the impedance tuner may be electrically coupled. A harmonic output level of the PA in the first impedance state may be greater than a harmonic output level of the PA in the second impedance state. The processor may be configured to control the impedance tuner to be in the second impedance state when communication is performed both in the first frequency band and the second frequency band, and control the impedance tuner to be in the first impedance state when communication is performed only in the first frequency band.