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Technical Paper
A Calibration Technique for Simultaneous Estimation of Actual Sensing Matrix Coefficients on Modulated Wideband Converters
| Author | Systems Design Lab, School of Engineering, University of Tokyo Zolboo Byambadorj others |
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| Summary | The Modulated Wideband Converter (MWC) is one of the promising sub-Nyquist sampling architectures for sparse wideband signal sensing applications. Its frequency support detection and the reconstruction ability is well-defined through compressed sensing theory. However, the reconstruction performance of the MWC is strictly limited by the non-ideal components in practical implementations. Previous calibration methods exploit sequential single-tone signals to estimate the actual transfer function of the MWC, which is fairly timeconsuming. We propose a new calibration method that estimates the actual sensing matrix coefficients of the MWC only with a single measurement based on a pilot multi-tone signal. The feasibility of the proposed calibration method is demonstrated in terms of normalized mean square error (NMSE) and image rejection ratio (IRR) of the reconstructed original signal |
| Key Words | Modulated wideband converter, Compressed sensing, Sparse wideband signal spectrum sensing, Calibration method, Practical implementation |
High-speed measurement of Piezoelectric MEMS equivalent circuit parameters by Swept-sine and PRBS signals
| Author | A&P Section 3, T2000 SE Department, System Solution Division, Sales Group Mitsuo Matsumoto others |
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| Summary | We have developed a method of applying swept-sine signals to DUTs with the objective of achieving high-speed measurement of the equivalent-circuit pa-rameters (four elements: Ls, Cs, Rs, and Cp) of piezoe-lectric MEMS(micro-electromechanical systems). Based on this development, we propose a solution that makes use of a PRBS (pseudo-random binary sequence) pattern that reduces test costs by utilizing an inexpensive digitalpin resource from among the measurement re-sources for ATE (automated test equipment). |
| Key Words | MEMS, Piezoelectric MEMS, Piezoelectric oscillator, Swept-sine, PRBS |
Over-the-Air (OTA) Test Socket and Handler Integration Technology for 5G Mass Production Testing
| Author | Advanced Technology Development Section, DT Development Department, DH Development Division, DH Business Group Natsuki Shiota others |
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| Summary | This paper presents the integration of socket, measurement antenna and handler for over-the-air (OTA) testing of antennain- package (AiP) devices using automated test equipment (ATE) for 5G applications. The design and characteristics of sockets for performing OTA testing in the radiating near field are also discussed. The paper also describes the structure of OTA handler integration using these sockets, and presents an example of device measurement using the OTA test unit prototype. |
| Key Words | Not Specified |
Application
An MCU+Wi-Fi (802.11n) EVM measurement method with correction of IQ skew imbalance
| Author | ADC, 93000 SE Department, System Solution Division, Sales Group Nobuhiro Shimizu others |
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| Summary | By correcting IQ skew imbalance with a T2000 general purpose waveform generator digitizer module (GPWGD), we were able to achieve the IEEE 802.11n (802.11n) 20MHz bandwidth residual EVM of 1% or less required for measuring devices. This paper presents correction methods for the arbitrary waveform generator (AWG) and digitizer (DGT) side, as well as measurement results. |
| Key Words | Not Specified |