Parallel RF Transceiver Testing Using OFDM Subcarriers
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Solution Overview
Problem
The low parallelism in RF transceiver testing leads to lower throughput and higher test costs due to the scarcity and high cost of RF test resources compared to digital test equipment, limiting the efficiency of manufacturing processes.
Innovation Solution
A test system with a signal terminal, splitter, and multiple test channels, each connected to a DUT, utilizing a shared reference clock and controller to concurrently test transceiver circuits of multiple devices at unique subcarriers of an OFDM signal, allowing high parallel testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single test instrument is used to test multiple RF transceivers, then test cost is reduced and resource utilization is improved, but testing throughput is limited due to the inability to perform concurrent measurements
Solution Approach 1:
The patent segments the frequency spectrum into multiple orthogonal subcarriers within an OFDM signal. Each RF transceiver under test is assigned to a unique subcarrier, allowing the single test instrument to simultaneously measure multiple transceivers by analyzing their respective subcarrier components in the frequency domain, thereby achieving concurrent testing without requiring multiple instruments
Solution Approach 2:
The patent transitions from time-domain sequential testing to frequency-domain parallel testing by utilizing orthogonal frequency-division multiplexing. This dimensional shift from time to frequency allows multiple transceivers to be tested simultaneously on different frequency subcarriers while using a single time-shared instrument, effectively multiplying throughput without increasing instrument count
2Adaptability or versatility
If an RF switch matrix is added to allow series testing of multiple DUTs, then device utilization is improved, but overall test time is not significantly reduced
Solution Approach 1:
The patent enables continuous useful action by allowing the test instrument to simultaneously acquire and process signals from multiple RF transceivers through orthogonal subcarrier separation. Unlike sequential switching methods where the instrument idle-waits between measurements, this approach maintains continuous measurement activity across all transceivers by exploiting frequency domain orthogonality, thereby eliminating wasted time and significantly reducing overall test time
3Productivity
If multiple RF test instruments are used to increase parallelism, then testing throughput is improved, but test cost and resource requirements increase
Solution Approach 1:
The patent makes a single test instrument universal by enabling it to perform multiple simultaneous measurements through OFDM-based frequency multiplexing. The instrument functions as both a single-frequency analyzer and a multi-frequency parallel tester by configuring the test signal as an OFDM waveform with multiple orthogonal subcarriers, allowing one instrument to replace what would traditionally require multiple instruments, thereby maintaining high throughput while reducing cost
Data Source
AI summary
A test system includes a test instrument with a signal terminal, a splitter having a splitter input connected to the signal terminal and multiple splitter outputs, multiple test channels, each including a socket with a socket terminal connected to a respective one of the splitter outputs to couple a transceiver terminal of an installed electronic device under test (DUT) to the respective splitter output, and a controller configured to operate the test instrument to concurrently test transceiver circuits of the installed DUTs at respective unique subcarriers of an OFDM signal at the signal terminal.