Load-Insensitive RF Power Detection Without Couplers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power detectors for power amplifiers are load-sensitive, requiring large area and are inefficient, making it difficult to accurately determine power output under varying load conditions, and the use of couplers is not cost-effective for shrinking device size.
Innovation Solution
A load-insensitive power detector that combines voltage and current sampling circuits with a current-to-voltage converter to generate a detector voltage independent of load, utilizing shared elements with the output matching network to reduce size and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coupler-based power detectors are used, then power detection function is provided, but device area increases
Solution Approach 1:
The patent combines voltage sampling and current sampling circuits into a single integrated power detector that shares components with the output matching network. This merging eliminates the need for separate coupler-based detection circuits, achieving accurate power measurement while minimizing additional area requirements.
Solution Approach 2:
The output matching network elements serve dual purposes: impedance matching for power amplifier operation and power detection through voltage and current sampling. This multi-functionality eliminates dedicated detection components, reducing overall device area while maintaining detection accuracy.
2Measurement precision
If conventional power detectors are used, then power measurement is provided, but load sensitivity causes measurement errors
Solution Approach 1:
The power detector uses feedback from both voltage sampling and current sampling circuits to calculate incident power. By measuring both voltage and current and using their product to determine power, the system compensates for load variations and achieves load-independent power measurement.
Solution Approach 2:
The detector measures both voltage and current parameters and uses their relationship to calculate power. By changing from single-parameter detection to dual-parameter detection, the system achieves immunity to load impedance variations while maintaining measurement accuracy.
3Ease of operation
If power detector is added to adjust power amplifier output, then power control capability is improved, but device complexity increases
Solution Approach 1:
The same output matching network components are used for both impedance matching and power detection functions. This eliminates the need for separate detection hardware, reducing circuit complexity while maintaining full power control capability through the integrated detector.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The power detector achieves at least four times improvement in measurement accuracy and reduces size compared to coupler-based detectors, providing load-independent power detection and enabling precise adjustment of RF signal power.
Implementation Method 1
a voltage sampling circuit in electrical communication with a collector of a power amplifier and configured to sample a first voltage from the power amplifier
Implementation Method 2
a current sampling circuit in electrical communication with the collector of the power amplifier and configured to sample an output current from the power amplifier
Implementation Method 3
a current-to-voltage converter connected between the voltage sampling circuit and an output of the load-insensitive power amplifier power detector. The current-to-voltage converter may be configured to convert the output current to obtain a second voltage
Implementation Method 4
a phase shifter configured to adjust a phase of the third voltage to obtain the first voltage. The phase shifter may adjust the phase of the third voltage to match a phase of the second voltage
Implementation Method 5
The current sampling circuit may include a transformer. The transformer may be formed from a first inductor of an output matching network that is aligned with a second inductor that is separate from the output matching network
Data Source
AI summary
A load-insensitive power amplifier power detector that excludes the use of couplers is disclosed. The load-insensitive power amplifier power detector may include a voltage sampling circuit in electrical communication with a collector of a power amplifier and configured to sample a first voltage from the power amplifier. The load-insensitive power amplifier power detector may include a current sampling circuit in electrical communication with the collector of the power amplifier and configured to sample an output current from the power amplifier. Further, the load-insensitive power amplifier power detector may include a current-to-voltage converter connected between the voltage sampling circuit and an output of the load-insensitive power amplifier power detector. The current-to-voltage converter may be configured to convert the output current to obtain a second voltage. Moreover, a combination of the first voltage and the second voltage may form a detector voltage corresponding to an incident power of the power amplifier.