Beamforming IC Impedance Tuners for Millimeter-Wave RF Testing
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Solution Overview
Problem
Conventional load-pull measurement setups for RF amplifiers are unsuitable for high frequencies like millimeter waves due to precision limitations and errors from external impedance tuners, which are bulky and prone to calibration issues.
Innovation Solution
Employing beamforming integrated circuits (ICs) as impedance tuners within an electronic testing setup, utilizing an RF coupler and controllable transmit channels to provide impedance tuning, eliminating the need for external tuners and reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external impedance tuners are used in conventional load-pull measurement setups, then impedance tuning capability is provided, but the setup becomes bulky, expensive, and prone to calibration errors at high frequencies
Solution Approach 1:
The patent merges the impedance tuning function with the beamforming IC by utilizing its existing controllable transmit channels and RF coupler, eliminating the need for separate external impedance tuners. This integration reduces device complexity while maintaining measurement precision at high frequencies
Solution Approach 2:
The beamforming IC is made multi-functional by using its controllable transmit channels not only for their primary beamforming purpose but also as impedance tuning elements. This universal usage reduces the need for dedicated external impedance tuning components, simplifying the overall testing setup
2Adaptability or versatility
If external impedance tuners are used, then impedance adjustment is possible, but cost and size of the testing setup increase
Solution Approach 1:
The impedance adjustment capability is merged into the beamforming IC structure by utilizing its integrated RF coupler and controllable transmit channels. This eliminates the need for bulky external impedance tuners, reducing the overall size and weight of the testing setup while preserving adaptability
3Measurement precision
If external impedance tuners are used, then impedance tuning is achieved, but errors from losses and calibration issues increase
Solution Approach 1:
By merging the impedance tuning function into the beamforming IC, the patent eliminates external connections and interfaces that cause losses and calibration errors. The integrated approach improves both measurement precision and reliability by reducing error sources
4Speed
If conventional testing setups are used, then basic testing is possible, but testing at high frequencies like millimeter waves is limited
Solution Approach 1:
The patent changes the operating parameters of the beamforming IC's transmit channels to enable high-frequency operation. By utilizing the IC's inherent high-frequency capabilities and controlling gain/phase at these frequencies, the system achieves both high frequency capability and measurement precision
Data Source
AI summary
Apparatus and methods for electronic testing using beamforming integrated circuits (ICs) as impedance tuners are disclosed herein. In certain embodiments, an electronic testing setup for a device-under-test (DUT) includes a radio frequency (RF) coupler including a through line connected to an output of the DUT, a first coupled line coupled to the through line, and a second coupled line coupled to the through line. Additionally, the electronic testing setup includes a beamforming IC including a first transmit channel having an output connected to the first coupled line, and a second transmit channel having an output connected to the second coupled line. A gain and a phase of the first transmit channel and a gain and a phase of the second transmit channel are each controllable to provide impedance tuning at the output of the DUT.