Movable Noncontact RF Current Measurement on a PCB Trace

Qiu, Haimi; Fang, Wenxiao; En, Yunfei; Huang, Yun; Liu, Yuan; Peng, Lai; Chen, Yiqiang; Shi, Chuang

doi:10.1109/tim.2017.2698900

Cited by 40 publications

(5 citation statements)

References 13 publications

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“…The first situation is when the useful signal and crosstalk signal input the nonlinear circuits, the amplitude of the useful signal is usually known. The second situation is when the strong and weak signals input the nonlinear circuits, the amplitude of the strong signal can be measured with the online current or voltage measurement method in [27], [28]. Therefore, there are only N + 1 unknowns.…”

Section: The Proposed Approachmentioning

confidence: 99%

A New Electromagnetic Emission Source Frequency and Factor Identification Approach for Nonlinear Circuits From the Output Spectrum Data

Yang

et al. 2020

IEEE Access

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For the practical nonlinear circuits, a number of new frequencies are generated in the output spectrum, which makes electromagnetic interference location quite challenging. To mitigate this problem, an approach is proposed to identify the electromagnetic emission source frequencies and nonlinear factors from the output spectrum of nonlinear circuits. The amplitude of the output spectrum with the input of two sine signals is first calculated based on the power series. Then, the Order Image (OI) is defined to reveal the output spectrum features, and its symmetry characteristic has been comprehensively analyzed. Results show that the maximum symmetry index is observed when the reference frequencies are equal to the excitation frequencies. Based on this observation, the electromagnetic emission source frequencies can be obtained. In addition, a Backward Algorithm (BA) has been introduced to extract nonlinear factors. The proposed approach only requires the output spectrum and the amplitude of one excitation. Compared with other techniques, like the Support Vector Machines and the Recurrent Neural Network, it needs much less prior information. Finally, several examples are carried out to verify the effectiveness of the proposed approach. Results show that the emission source frequencies and nonlinear factors can be accurately extracted. Therefore, the proposed approach shows great potential in electromagnetic interference location and characteristic analysis for nonlinear circuits. INDEX TERMS Electromagnetic emission sources, identification, nonlinear circuits, Order Image, power series.

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Section: The Proposed Approachmentioning

confidence: 99%

A New Electromagnetic Emission Source Frequency and Factor Identification Approach for Nonlinear Circuits From the Output Spectrum Data

Yang

et al. 2020

IEEE Access

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“…Near‐field measurement 1–8 are widely applied to electromagnetic (EM) interference analysis, 9–11 reconstruction of equivalent emission sources, 12,13 faults location, 13,14 shielding analysis, 15 radio frequency (RF) current and voltage measurement, 16,17 and so forth. The near‐field probe is a key tool for near‐field measurement, so the design and characterization of the probe are essential for the above applications 1–3,18–28 …”

Section: Introductionmentioning

confidence: 99%

De‐embedding calibration for an electromagnetic dual probe using GCPW

Li,

Shao,

Tian

et al. 2023

Micro & Optical Tech Letters

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An ultrawideband de‐embedding calibration method (DCM) for a dual probe is proposed in this paper. Different from the conventional calibration method (CCM), in which a microstrip calibrator and the dual probe form a three‐port calibration network, the proposed calibration system is a four‐port network. By using two different lengths of grounded coplanar waveguide (GCPW) calibrators, namely line‐kit and through‐kit, the de‐embedded ‐parameter model of the calibration network is obtained. Measured results show that the ripple of the DCM with GCPW reduced by 59% of the CCM with the microstrip calibrator, and the phase delay has been almost compensated. In addition, the proposed method reduces the attenuation by approximately 0.7 dB at 10 GHz and 1.15 dB at 20 GHz. The calibration results indicate that the working frequency of the DCM is up to 22 GHz.

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“…A near-field probe can efficiently solve this problem through point-by-point scanning on the surface of the device under test (DUT) [6][7][8]. Traditionally, passive probes have been able to pick up most noise signals.…”

Section: Introductionmentioning

confidence: 99%

Design of Miniature Ultrawideband Active Magnetic Field Probe Using Integrated Design Idea

Zhou

Yan

et al. 2023

Sensors

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This article presents a miniature ultrawideband active magnetic probe which is composed of a passive structure and an active amplification circuit structure. The active circuit mainly contains two chips, specifically an amplification chip (HMC797APM5E) and a power management chip (HMC980LP4E). The maximum size of the probe is no more than 64 × 41.5 mm2. Compared with the passive probe with the same-sized loop, the sensitivity of the proposed probe is enhanced by 25 dB through the active circuit design. The working frequency bandwidth of the proposed probe can cover 9 kHz to 18 GHz. Additionally, the flatness is about ±4 dB in terms of |S21| in the stable working bandwidth. It is efficient for high-frequency near-field scanning.

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Movable Noncontact RF Current Measurement on a PCB Trace

Cited by 40 publications

References 13 publications

A New Electromagnetic Emission Source Frequency and Factor Identification Approach for Nonlinear Circuits From the Output Spectrum Data

A New Electromagnetic Emission Source Frequency and Factor Identification Approach for Nonlinear Circuits From the Output Spectrum Data

De‐embedding calibration for an electromagnetic dual probe using GCPW

Design of Miniature Ultrawideband Active Magnetic Field Probe Using Integrated Design Idea

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