Adaptive Electrical Balance Duplexer for Power-Dependent Isolation
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Solution Overview
Problem
Transceivers face degraded signal quality and isolation due to varying power amplifier output powers, which affect the performance of electrical balance duplexers, particularly in cellular devices with higher power amplifier output.
Innovation Solution
Implementing an adaptive power equalizing electrical balance duplexer with a power equalizer control to adjust attenuation and impedance, maintaining the average voltage swing of the impedance tuner within a desired range, thereby maintaining signal isolation across different power amplifier output levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power amplifier output power is increased to improve transmission range and signal strength, then the transmission capability is improved, but the isolation between transmission signal and received signal degrades
Solution Approach 1:
The patent implements dynamic adjustment of the impedance tuner parameters based on the power amplifier output power level. The system transitions from a static impedance matching network to a dynamic one that adapts its characteristics in real-time according to the operating power conditions, thereby maintaining optimal isolation across varying power levels.
Solution Approach 2:
The patent changes the electrical parameters (impedance, capacitance, inductance) of the impedance tuner circuit in response to power amplifier output power variations. By adjusting these parameters dynamically, the system compensates for the degradation in signal isolation that occurs at higher power levels, thus resolving the contradiction between transmission power and signal isolation.
2Adaptability or versatility
If the output power of the power amplifier varies under different operating conditions, then the transceiver can adapt to different communication ranges, but the performance of the impedance tuner degrades
Solution Approach 1:
The patent implements a feedback mechanism where the system monitors the power amplifier output power and uses this information to adjust the impedance tuner parameters accordingly. This closed-loop control ensures that the impedance tuner maintains optimal performance across varying operating conditions, preventing degradation despite power variations.
Solution Approach 2:
The patent transforms the static impedance tuner into a dynamic component that can adapt its characteristics in real-time. By making the impedance tuner parameters variable rather than fixed, the system maintains reliable performance across different power output conditions, resolving the contradiction between adaptability and reliability.
3Power
If the voltage swing of the impedance tuner increases with higher power amplifier output power, then the transmission power is improved, but the isolation between signals degrades
Solution Approach 1:
The patent changes the electrical parameters of the impedance tuner circuit in response to power amplifier output power variations. By adjusting these parameters dynamically, the system compensates for the degradation in signal isolation that occurs at higher power levels, thus resolving the contradiction between transmission power and signal isolation.
Data Source
AI summary
The representative embodiments discussed in the present disclosure relate to techniques in which isolation between transmission signals and received signals in a transceiver may be maintained across a range of transceiver operating conditions, such as across range of output powers of a power amplifier of the transceiver. More specifically, an electrical balance duplexer may be implemented to include an adaptive power equalizer and a power equalizer control such that the attenuation of the electrical balance duplexer may be adjusted based on the transceiver operating conditions. For instance, a method may be employed to determine the output power of the power amplifier and to adjust the attenuation of the adaptive power equalizer based in part on the output power to maintain isolation between the transmission signals and the received signals.