Compact Dual Diode RF Power Detector for Integrated Amplifiers
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Solution Overview
Problem
Conventional RF power detectors for integrated power amplifiers increase MMIC die size and cost due to the need for additional components like directional couplers and coupling lines, leading to increased circuit size and insertion loss.
Innovation Solution
A compact dual diode RF power detector design that integrates directional couplers and detectors within the power amplifier footprint, using a symmetrical dual diode configuration and quarter-wavelength transmission lines to minimize size and cost, while maintaining performance by combining power detection signals independently of load phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional directional coupler based power detector is integrated at the output RF port of a power amplifier, then power measurement is achieved, but the circuit size and insertion loss increase
Solution Approach 1:
The patent combines the power detection function with the existing power combiner/impedance transformer structure. The directional couplers are integrated within the power amplifier footprint by utilizing the existing output structure, merging multiple functions (power combining, impedance transformation, and power detection) into a single integrated circuit without requiring separate detection components
Solution Approach 2:
The output structure of the power amplifier serves multiple functions: it acts as both a power combiner/impedance transformer and as the integration point for the power detector. The directional couplers are embedded within this multi-functional structure, allowing the same physical space to perform both power amplification and power measurement functions
2Measurement precision
If a conventional directional coupler based power detector is integrated at the output RF port of a power amplifier, then power measurement is achieved, but additional cost is incurred
Solution Approach 1:
The power detection components are merged with the existing power amplifier structure, eliminating the need for separate detection circuits. This integration reduces component count and simplifies the manufacturing process, thereby reducing additional costs associated with conventional separate power detector implementations
3Measurement precision
If a conventional directional coupler based power detector is integrated at the output RF port of a power amplifier, then power measurement is achieved, but insertion loss increases
Solution Approach 1:
The directional couplers are integrated within the existing power amplifier output structure rather than being added as separate external components. This integration minimizes additional signal path length and reduces the number of discrete connections, thereby minimizing insertion loss while maintaining accurate power measurement capability
4Area of stationary object
If a compact dual diode RF power detector is integrated within the power amplifier footprint, then die size is minimized, but device complexity increases
Solution Approach 1:
The power detection function is segmented into two separate but symmetrical detector paths, each handling one half of the differential signal. This segmentation allows for simplified individual detector designs that can be easily integrated within the power amplifier footprint, reducing overall die size while maintaining manageability of the detection structure
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 solution allows for accurate power detection without increasing the power amplifier's die size or cost, maintaining performance and enabling integration within the existing footprint of the power combiner/impedance transformer.
Implementation Method 1
A coupled port of the first directional coupler is coupled to the first detector. A coupled port of the second directional coupler is coupled to the second detector.
Implementation Method 2
using a symmetrical dual diode configuration and quarter-wavelength transmission lines to minimize size and cost
Data Source
AI summary
An apparatus includes a first directional coupler, a second directional coupler, a first detector, and a second detector. A through port of the first directional coupler is coupled to a through port of the second directional coupler. An isolated port of the first directional coupler is coupled to an isolated port of the second directional coupler. A coupled port of the first directional coupler is coupled to the first detector. A coupled port of the second directional coupler is coupled to the second detector. A detected power signal is generated by combining an output of the first detector and an output of the second detector.