A 0.0048mm2 0.43-to-1.0V 0.54-to-1.76GHz Bias-Current-Free PLL in 14nm FinFET CMOS

This paper deals with a well-known problem of the transient DC-bias current occurring during a phase shift transition in dual active bridge (DAB) DC/DC converters. This phenomenon, if not compensated, can cause damage to the converter or deteriorate its performance. One aim of this paper is to present a solution which allows for the elimination of the undesired transient DC-bias component in current waveforms. This solution is the dual rising edge shift (DRES) compensation algorithm. It provides a very simple implementation and fast settling time within the first half of a switching period. Moreover, the solution is independent on any measurements or system parameter values. It is based on the double-sided single phase shift (DSSPS) modulation, which is described in detail along with a converter model in steady-state. Then, the mechanisms leading to the transient DC-bias are explained, and the compensation algorithm is derived. The performance of the algorithm has been tested using a laboratory prototype. A comprehensive set of tests, involving rapid step changes in power flow and frequency sweep, are provided. Finally, the features of the proposed algorithm are briefly discussed.

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Bias current dependent magnetoresistance in CoFeB ultrathin films on p-type Si (100) substrate

10.1063/5.0019035 ◽

2020 ◽

Author(s):

Snehal Mandal ◽

I. Das

Keyword(s):

Ultrathin Films ◽

Bias Current ◽

P Type

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Transient DC Bias Current Reducing for Bidirectional Dual Active Bridge DC-DC Converter by Modifying Modulation

IEEE Transactions on Power Electronics ◽

10.1109/tpel.2021.3077020 ◽

2021 ◽

pp. 1-1

Author(s):

Caiwei Yang ◽

Jian Wang ◽

Chenchen Wang ◽

Xiaojie You ◽

Xu Lei

Keyword(s):

Bias Current ◽

Dual Active Bridge ◽

Dc Bias

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Dependence of frequency chirping on bias current in LD wavelength conversion

IEEE Photonics Technology Letters ◽

10.1109/68.502088 ◽

1996 ◽

Vol 8 (6) ◽

pp. 767-769 ◽

Cited By ~ 4

Author(s):

K. Inoue

Keyword(s):

Wavelength Conversion ◽

Bias Current ◽

Frequency Chirping

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Effect of combining a DC bias current with an AC transport current on AC losses in a high temperature superconductor

IEEE Transactions on Applied Superconductivity ◽

10.1109/77.783481 ◽

1999 ◽

Vol 9 (2) ◽

pp. 1065-1068 ◽

Cited By ~ 2

Author(s):

P. Dolez ◽

B. Des Ligneris ◽

M. Aubin ◽

Wen Zhu ◽

J. Cave

Keyword(s):

High Temperature ◽

High Temperature Superconductor ◽

Bias Current ◽

Transport Current ◽

Ac Losses ◽

Dc Bias

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Preamplifier With Ultra Low Frequency Cutoff for Infrasonic Condenser Microphone

ASME 2012 Noise Control and Acoustics Division Conference ◽

10.1115/ncad2012-1468 ◽

2012 ◽

Author(s):

Rasmus Trock Kinnerup ◽

Arnold Knott ◽

Ole Cornelius Thomsen ◽

Kresten Marbjerg ◽

Per Rasmussen

Keyword(s):

Input Impedance ◽

Dynamic Range ◽

Cutoff Frequency ◽

Low Frequency ◽

Input Resistance ◽

Bias Current ◽

Microphone Signal ◽

Low Frequencies ◽

Pass Filter ◽

Condenser Microphone

Measuring infrasonic sound sets high requirements on the instruments used. Typically the measurement chain consists of a microphone and a preamplifier. As the input resistance of the preamplifier forms a high pass filter with the capacitance of the microphone in the picofarad range, measuring ultra low frequencies becomes a challenge. The electric preamplifier presented in this paper together with a prepolarized condenser microphone form a measurement system. The developed preamplifier connects the microphone signal directly to the input of an operational amplifier with ultra high input impedance. The bias current for the preamplifier further complicates the signal amplification. A configuration of two diode-connected FETs provide the input bias current. The resulting input impedance of nearly 1 TΩ yields a total lower limiting −3 dB cutoff frequency of 8 mHz and a dynamic range of 95 dB. Being able to measure down to ultra low frequencies in the infrasonic frequency range will aid actors in the debate on wind turbine noise. Sonic booms from supersonic flights include frequencies down to 10 mHz and the preamplifier proposed in this paper will aid scientists trying to modify the N-shaped shock wave at high level which prohibits flights in land zones.

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