Analysis of the common-mode induced differential-mode distortion in Gm-C filters

2010 ◽  
Author(s):  
Terdpun Choogorn ◽  
Jirayuth Mahattanakul ◽  
Apisak Worapishet
Keyword(s):  
Differential Mode ◽  
Common Mode ◽  
The Common

Tunable balanced to balanced filtering power divider with high common-mode suppression

Frequenz ◽  
2020 ◽  
Vol 74 (7-8) ◽  
pp. 263-270
Author(s):  
Cao Zeng ◽  
Xue Han Hu ◽  
Feng Wei ◽  
Xiao Wei Shi
Keyword(s):  
Return Loss ◽  
High Selectivity ◽  
Power Divider ◽  
Center Frequency ◽  
Differential Mode ◽  
Common Mode ◽  
Mode Suppression ◽  
The Common ◽  
Equal Power ◽  
Good Agreement

AbstractIn this paper, a tunable balanced-to-balanced in-phase filtering power divider (FPD) is designed, which can realize a two-way equal power division with high selectivity and isolation. A differential-mode (DM) passband with a steep filtering performance is realized by applying microstrip stub-loaded resonators (SLRs). Meanwhile, six varactors are loaded to the SLRs to achieve the center frequency (CF) and bandwidth adjustment, respectively. U-type microstrip lines integrated with stepped impedance slotline resonators are utilized as the differential feedlines, which suppress the common-mode (CM) intrinsically, making the DM responses independent of the CM ones. A tuning center frequency from 3.2 to 3.75 GHz and a fractional bandwidth (12.1–17.6%) with more than 10 dB return loss and less than 2.3 dB insertion loss can be achieved by changing the voltage across the varactors. A good agreement between the simulated and measured results is observed. To the best of authors' knowledge, the proposed balanced-to-balanced tunable FPD is first ever reported.

Fully Differential Class-AB OTA with Improved CMRR

2017 ◽  
Vol 26 (11) ◽  
pp. 1750169 ◽  
Author(s):  
Francesco Centurelli ◽  
Pietro Monsurrò ◽  
Gaetano Parisi ◽  
Pasquale Tommasino ◽  
Alessandro Trifiletti
Keyword(s):  
Cmos Technology ◽  
Current Mirror ◽  
Differential Mode ◽  
Common Mode ◽  
Common Mode Rejection Ratio ◽  
Class Ab ◽  
Fully Differential ◽  
Rejection Ratio ◽  
Mode Behavior ◽  
The Common

This paper presents a fully differential class-AB current mirror OTA that improves the common-mode behavior of a topology that presents very good differential-mode performance but poor common-mode rejection ratio (CMRR). The proposed solution requires a low-current auxiliary circuit driven by the input signal, to compensate the effect of the common-mode input component. Simulations in 40-nm CMOS technology show a net reduction of common-mode gain of more than 90[Formula: see text]dB without affecting the differential-mode behavior; a sample-and-hold amplifier exploiting the proposed amplifier has also been simulated.

The AMB System’s EMI Analysis of Backup Helium Circulator for HTR-10GT

2013 ◽  
Author(s):  
Yan Zhou ◽  
JingJing Zhao ◽  
Ni Mo ◽  
Zhe Sun ◽  
SuYuan Yu
Keyword(s):  
Power Amplifier ◽  
Theoretical Basis ◽  
Current Source ◽  
Voltage Source ◽  
Differential Mode ◽  
Common Mode ◽  
Turn On ◽  
Conducted Emission ◽  
The Common ◽  
Amb System

With the application in HTR-10GT, the reliability and stability of the AMB system should be studied deeply. Especially EMI analysis on the switch power amplifier is needed to be done, since which one is the main interference source for AMB during the switch turn-on and turn-off. Based on it, a simplified and improved modeling method is listed by dividing the nonlinear transition into several stages, and the models of the voltage source and current source are built in the form of the piece-wise linear way. The conducted emission on the differential mode noise and the common mode is shown by simulation. The result could provide the theoretical basis on the designing the grounding, filter and isolation for the AMB system.

Common mode interference reduction in seismic recording

Geophysics ◽  
1982 ◽  
Vol 47 (12) ◽  
pp. 1672-1680 ◽  
Author(s):  
Miles A. Smither ◽  
Arnold Pater
Keyword(s):  
Poor Quality ◽  
Seismic Signals ◽  
Recording Instrument ◽  
Differential Mode ◽  
Notch Filters ◽  
Common Mode ◽  
Interference Reduction ◽  
Seismic Recording ◽  
The Common ◽  
Mode Interference

In spite of the prevalence of high common mode rejection ratio (CMRR) input amplifiers, notch filters are routinely used in seismic recording operations to reduce common mode induced interference. An electrical model of the recording environment which predicts the degradation in system CMRR caused by cable imperfections such as imbalance and leakage is described in this paper. System CMRRs as low as 20 dB can be caused by poor quality cables. A new method of controlling common mode interference has been developed which has none of the disadvantages of notch filters. The method minimizes the correlation between the common mode and differential mode signals at the recording instrument. This process has no effect on the desired seismic signals, has minimal effect on the system noise, and typically results in a system CMRR in excess of 100 dB.

scholarly journals Separation of the common-mode- and differential-mode-conducted EMI noise

1996 ◽  
Vol 11 (3) ◽  
pp. 480-488 ◽  
Author(s):  
Ting Guo ◽  
D.Y. Chen ◽  
F.C. Lee
Keyword(s):  
Differential Mode ◽  
Common Mode ◽  
The Common ◽  
Conducted Emi

scholarly journals Reliability of Boost PFC Converters with Improved EMI Filters

Electronics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 413 ◽  
Author(s):  
Haoqi Zhu ◽  
Dongliang Liu ◽  
Xu Zhang ◽  
Feng Qu
Keyword(s):  
Electromagnetic Interference ◽  
High Frequency ◽  
Power Converter ◽  
Differential Mode ◽  
Conduction Path ◽  
Common Mode ◽  
Class B ◽  
The Common ◽  
Emi Filter ◽  
Stability Issues

The switching device in a power converter can produce very serious electromagnetic interference (EMI). In order to solve this problem and the associated reliability and stability issues, this article aimed to analyze and model the boost power factor correction (PFC) converter according to the EMI conduction path. The sources of common-mode (CM) and differential-mode (DM) noise of the boost PFC converter were analyzed, and the DM and CM equivalent circuits were deduced. Furthermore, high-frequency modeling of the common-mode inductor was developed using a precise model, and the EMI filter was designed. According to the Class B standard for EMI testing, it is better to restrain the EMI noise in the frequency range (150 kHz to 30 MHz) of the EMI conducted disturbance test. Using this method, a 2.4-kW PFC motor driving supply was designed, and the experimental results validate the analysis.

scholarly journals Simple Setup for Measuring the Response to Differential Mode Noise of Common Mode Chokes

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 381 ◽  
Author(s):  
Pablo González-Vizuete ◽  
Carlos Domínguez-Palacios ◽  
Joaquín Bernal-Méndez ◽  
María A. Martín-Prats
Keyword(s):  
High Frequency ◽  
Electromagnetic Compatibility ◽  
Differential Mode ◽  
Common Mode ◽  
Low Frequencies ◽  
High Frequencies ◽  
Natural Modes ◽  
Magnetic Couplings ◽  
The Common ◽  
Conducted Emissions

This work presents a technique to measure the attenuation of differential mode noise provided by common mode chokes. The proposed setup is a simpler alternative to the balanced setup commonly employed to that end, and its main advantage is that it avoids the use of auxiliary circuits (baluns). We make use of a modal analysis of a high-frequency circuit model of the common mode choke to identify the natural modes actually excited both in the standard balanced setup and in the simpler alternative setup proposed here. This analysis demonstrates that both setups are equivalent at low frequencies and makes it possible to identify the key differences between them at high frequencies. To analyze the scope and interest of the proposed measurement technique we have measured several commercial common mode chokes and we have thoroughly studied the sensitivity of the measurements taken with the proposed setup to electric and magnetic couplings. We have found that the proposed setup can be useful for quick assessment of the attenuation provided by a common mode choke for differential mode noise in a frequency range that encompasses the frequencies where most electromagnetic compatibility regulations impose limits to the conducted emissions of electronic equipment.

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