RF Antenna Testing via DC Voltage Conversion
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Solution Overview
Problem
Testing semiconductor devices and integrated circuits with RF antennas is challenging due to inconsistent antenna placement, requiring expensive and complex setups, especially when antennas are mounted on the opposite side of the package, leading to issues with signal transmission and reception.
Innovation Solution
A testing system with small flexible receiving antennas that convert RF signals to DC voltages, allowing for the reconstruction of antenna patterns, using a calibrated 'golden unit' to set performance limits, and an enclosure made of radome-like materials to minimize signal loss, enabling efficient and cost-effective testing of RF antennas with beam steering capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional testing methods with waveguide or probe systems are used, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical testing systems (waveguide, probe systems) with an electromagnetic field-based measurement system. The system uses receiving antennas to capture RF signals radiated by the device under test, and RF-to-DC conversion circuits to measure signal strength, eliminating the need for mechanical contact and complex positioning mechanisms while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces receiving antennas and RF-to-DC conversion circuits as intermediary elements between the transmitting antenna and the measurement system. These intermediaries capture and convert the RF signals into measurable DC voltages, providing a simplified interface for measurement without requiring direct mechanical or electrical contact with the device under test.
2Measurement precision
If custom setups are used for each chip antenna placement, then measurement precision is improved, but productivity decreases due to reconfiguration time
Solution Approach 1:
The patent creates a universal testing system with multiple receiving antennas positioned at different locations. This single system can measure antennas with various placements (top, bottom, sides) by selecting appropriate receiving antennas, eliminating the need for custom setups for each chip design and enabling high-volume production testing.
Solution Approach 2:
The patent implements a dynamic selection mechanism where the system can choose which receiving antenna to use based on the antenna placement on the device under test. This dynamic adaptability allows the same physical system to handle different antenna configurations without reconfiguration, maintaining measurement precision while improving productivity.
3Adaptability or versatility
If antennas are mounted on the opposite side of the package from I/O ports, then device integration is improved, but ease of operation worsens due to signal transmission difficulties
Solution Approach 1:
The patent transitions from a two-dimensional planar testing approach to a three-dimensional volumetric measurement approach. By positioning receiving antennas in three-dimensional space around the device under test and using RF signal propagation through the air, the system can access antennas mounted on any surface (top, bottom, or sides) without requiring physical access from a specific direction, thus solving the signal transmission problem for oppositely-mounted antennas.
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
This solution allows for accurate and rapid performance measurement of RF antennas, reducing testing costs and time by using DC voltage levels to determine if antennas meet performance requirements, without the need for expensive waveguide or probe systems.
Implementation Method 1
a receiving antenna in the enclosure to receive the RF output from the transmitting antenna
Implementation Method 2
a circuit that converts the RF signals into direct current (DC) voltages where the DC voltage level is proportionate to the RF output signal level
Data Source
AI summary
A testing system and method for testing integrated circuits with radio frequency (RF) antennas is disclosed. The system includes an alignment plate for receiving a device under test (DUT) having an RF transmitting antenna, an enclosure surrounding but separated from the transmitting antenna, a receiving antenna in a telescopic enclosure, and a conversion circuit connected to the receiving antenna. The conversion circuit is configured to convert an RF output from the DUT to a direct current (DC) voltage. The DC voltage is used as a proxy for the RF output to test the DUT. When testing chips with RF ports, the chip or ports are surrounded by the enclosure which is non-radio reflective and includes antennas for receiving RF outputs disbursed around the enclosure, or a single antenna. If multiple receiving antennas are used, sequential testing can also detect directional transmission patterns to confirm that the direction is correctly calibrated.