RF Amplifier Power Detection With Impedance Isolation
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Solution Overview
Problem
Existing amplification devices suffer from increased insertion loss and reduced linearity due to the use of couplers and log power detectors, which impair signal quality and power measurement accuracy.
Innovation Solution
The amplification device incorporates an amplification unit, impedance unit, and log power detector with parallel or cascade structures to minimize loading effects, using impedance units to adjust impedance and include temperature compensation mechanisms to stabilize power signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a coupler is coupled to the power amplifiers to detect signal power, then the signal power can be measured, but the insertion loss increases and signal quality deteriorates
Solution Approach 1:
The patent introduces an impedance unit as an intermediary component between the power amplifier and the log power detector. This impedance unit acts as a mediator that transforms the detected signal while maintaining proper impedance matching, thereby enabling power measurement without the signal quality degradation and insertion loss associated with direct coupler connection.
2Measurement precision
If a log power detector is directly coupled to the power amplifiers to measure input signal power, then the power measurement can be performed, but the loading effect worsens the linearity between input and output signals
Solution Approach 1:
The impedance unit serves as a buffering intermediary that isolates the log power detector from the power amplifier. This intermediary structure prevents the loading effect of the detector from directly impacting the amplifier's linearity, while still enabling accurate power measurement through the transformed signal.
Solution Approach 2:
The impedance unit transforms the signal parameters (voltage, current, impedance) between the power amplifier and the log power detector. By changing these parameters appropriately, the system maintains the linearity of the power amplifier while enabling the detector to operate in its optimal range for accurate power measurement.
Data Source
AI summary
An amplification device includes an amplification unit, an impedance unit and a log power detector. The amplification unit includes an input terminal for receiving a radio-frequency signal, an output terminal for outputting an amplified radio-frequency signal, and a detected terminal for outputting a detected signal related to the radio-frequency signal. The impedance unit is used to provide an impedance. The impedance unit includes an input terminal coupled to the detected terminal of the amplification unit for receiving the detected signal, and an output terminal for outputting a power signal. The log power detector is used to generate a power indication signal according to the power signal. The log power detector includes an input terminal coupled to the output terminal of the impedance unit, and an output terminal for outputting the power indication signal.