14.7 A Modular Hybrid LDO with Fast Load-Transient Response and Programmable PSRR in 14nm CMOS Featuring Dynamic Clamp Tuning and Time-Constant Compensation

2019 ◽  
Author(s):  
Xiaosen Liu ◽  
Harish K. Krishnamurthy ◽  
Taesik Na ◽  
Sheldon Weng ◽  
Khondker Z. Ahmed ◽  
...  
Keyword(s):  
Time Constant ◽  
Transient Response ◽  
Dynamic Clamp

Transient Response Control of Two-Mass System via Polynomial Approach

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Yue Qiao ◽  
Junyi Cao ◽  
Chengbin Ma
Keyword(s):  
Time Constant ◽  
Transient Response ◽  
Controller Design ◽  
Polynomial Method ◽  
Transient Responses ◽  
Mass System ◽  
Response Control ◽  
Characteristic Ratio ◽  
Starting Point ◽  
Generalized Time

This paper discusses the application of polynomial method in the transient response control of a benchmark two-mass system. It is shown that transient responses can be directly addressed by specifying the so-called characteristic ratios and the generalized time constant. The nominal characteristic ratio assignment (CRA) is a good starting point for controller design. And the characteristic ratios with lower indices have a more dominant influence. Two practical low-order control configurations, the integral-proportional (IP) and modified-integral-proportional-derivative (m-IPD) controllers are designed. The primary design strategy of the controllers is to guarantee the lower-index characteristic ratios to be equal to their nominal values, while the higher-index characteristic ratios are determined by the interaction with the generalized time constant and the limits imposed by zeros, a specific control configuration, etc. The demonstrated relationship between the transient responses and the assignments of characteristic ratios and generalized time constant in simulation and experiments explains the effectiveness of the polynomial-method-based controller design.

Transient electromagnetic response of a polarizable ground

Geophysics ◽  
1981 ◽  
Vol 46 (7) ◽  
pp. 1037-1041 ◽  
Author(s):  
T. Lee
Keyword(s):  
Time Constant ◽  
Transient Response ◽  
Induced Polarization ◽  
Electromagnetic Response ◽  
Relaxation Model ◽  
Reverse Polarity ◽  
Transient Electromagnetic ◽  
Show Evidence ◽  
Positive Time

When a uniform ground has a conductivity which may be described by a Cole‐Cole relaxation model with a positive time constant, then the transient response of such a ground will show evidence of induced polarization (IP) effects. The IP effects cause the transient initially to decay quite rapidly and to reverse polarity. After this reversal the transient decays much more slowly, the decay at this stage being about the same rate as a nonpolarizable ground.

scholarly journals Analytical modelling of the transient response of thermopile-based MEMS sensors

2016 ◽  
Vol 19 (2) ◽  
pp. 70
Author(s):  
D.V. Randjelović ◽  
A.G. Kozlov ◽  
O.M. Jakšić ◽  
M.M. Smiljanić ◽  
P.D. Poljak
Keyword(s):  
Thermal Conductivity ◽  
Ambient Temperature ◽  
Analytical Model ◽  
Time Constant ◽  
Transient Response ◽  
Analytical Approach ◽  
Mems Devices ◽  
Mems Sensors ◽  
Transient Behaviour ◽  
Different Gases

This work presents an analytical model dedicated to study of the transient response of multipurpose MEMS devices based on thermopile sensors. In general, thermopile sensors response depends on ambient temperature, thermal conductivity of the gas inside the housing and the pressure of the gas. The presented model takes into account all these parameters. This model was sucessfully implemented for the study of transient behaviour of our multifunctional sensors with p+Si/Al thermocouples and a bulk micromachined bilayered membrane. Simulations were performed for different gases of interest and conclusions were deduced regarding the influence of relevant parameters on the thermal time constant. This analytical approach is general and flexible enough to be implemented for analysis of the transient behaviour of thermopile-based sensors when used for different applications.

Transient electromagnetic response of a thin conducting plate embedded in conducting host rock

Geophysics ◽  
1985 ◽  
Vol 50 (8) ◽  
pp. 1342-1349 ◽  
Author(s):  
S. S. Rai
Keyword(s):  
Time Constant ◽  
Transient Response ◽  
Onset Time ◽  
Electromagnetic Response ◽  
Late Time ◽  
Host Medium ◽  
Transient Electromagnetic ◽  
Conducting Plate ◽  
Free Air ◽  
Em Method

The transient response of a thin, rectangular conducting plate in a conductive host medium is presented for a horizontal‐loop electromagnetic (EM) system considering both a step and pulse EM method (PEM) excitation. For a shallow plate‐like conductor, the current‐gathering effect is preceded by a blanking effect. However, for deeper plates, current gathering was not observed. The effect of increasing plate depth, the ratio of the time constant of the plate to that of the host, and the plate time constant on the temporal characteristics of blanking and current gathering are investigated. The onset time for current gathering is independent of the plate time constant and is essentially a property of the host medium. At later observations (⩾5 ms) the decay of the plate in the host resembles the decay of the plate in free air. An interpretation scheme is proposed to determine plate parameters for Crone PEM measurements using the responses in two relatively late time channels.

scholarly journals High-Resolution Micro-Pirani Pressure Sensor With Transient Response Processing and Time-Constant Evaluation

2012 ◽  
Vol 12 (10) ◽  
pp. 3090-3097 ◽  
Author(s):  
Olivier Legendre ◽  
Hervé Bertin ◽  
Olivier Garel ◽  
Ming Zhang ◽  
Hervé Mathias ◽  
...  
Keyword(s):  
High Resolution ◽  
Time Constant ◽  
Transient Response ◽  
Pressure Sensor

scholarly journals Influence of System Parameters on Fuse Protection Use in Regenerative DC Drives

Energies ◽  
2009 ◽  
Vol 2 (2) ◽  
pp. 411-426 ◽  
Author(s):  
Mohammed Redha Qader ◽  
Hedaia Al-Asooly ◽  
Isa Salman Qamber
Keyword(s):  
Time Constant ◽  
Transient Response ◽  
Semiconductor Devices ◽  
Difficult Case ◽  
System Parameters ◽  
Current Limiting ◽  
Commutation Failure ◽  
In Series ◽  
Dc Drive ◽  
Drive Systems

Current limiting fuses are widely used to protect the thyristors in DC drive systems. One very important problem is the choice of the correct voltage rating for fuses protecting regenerative DC drives, where many types of fault may occur, which makes fuse protection difficult. In the event of a commutation failure while regenerating, the fuses need to interrupt the loop supplied by the AC and DC voltages acting in series, which is the most difficult case for protection by fuses. In this paper a detailed study of the complete interruption process has been investigated by modeling of arcing process of the fuse protection against the regenerative circuit internal commutation fault. The effect of varying the motor time constant, supply impedance, number of fuses used to clear the fault and DC machine rating on the total transient response is studied. The model of a 200 A fuse is employed in this study. Fuses in series with both the semiconductor devices (F1) and fuses in AC lines (F2) are considered. Comparison was made between arc energy produced for fuses protecting the regenerative circuit if failure occurs, with the arc energy produced in a standard AC test in order to investigate the required voltage rating for the fuse.

scholarly journals Activation of Ih and TTX-sensitive sodium current at subthreshold voltages during CA1 pyramidal neuron firing

2015 ◽  
Vol 114 (4) ◽  
pp. 2376-2389 ◽  
Author(s):  
Jason Yamada-Hanff ◽  
Bruce P. Bean
Keyword(s):  
Action Potential ◽  
Time Constant ◽  
Pyramidal Neurons ◽  
Sodium Current ◽  
Hippocampal Slices ◽  
Input Resistance ◽  
Hcn Channels ◽  
Dynamic Clamp ◽  
Ca1 Neurons ◽  
Ca1 Pyramidal Neurons

We used dynamic clamp and action potential clamp techniques to explore how currents carried by tetrodotoxin-sensitive sodium channels and HCN channels ( Ih) regulate the behavior of CA1 pyramidal neurons at resting and subthreshold voltages. Recording from rat CA1 pyramidal neurons in hippocampal slices, we found that the apparent input resistance and membrane time constant were strongly affected by both conductances, with Ih acting to decrease apparent input resistance and time constant and sodium current acting to increase both. We found that both Ih and sodium current were active during subthreshold summation of artificial excitatory postsynaptic potentials (EPSPs) generated by dynamic clamp, with Ih dominating at less depolarized voltages and sodium current at more depolarized voltages. Subthreshold sodium current—which amplifies EPSPs—was most effectively recruited by rapid voltage changes, while Ih—which blunts EPSPs—was maximal for slow voltage changes. The combined effect is to selectively amplify rapid EPSPs. We did similar experiments in mouse CA1 pyramidal neurons, doing voltage-clamp experiments using experimental records of action potential firing of CA1 neurons previously recorded in awake, behaving animals as command voltages to quantify flow of Ih and sodium current at subthreshold voltages. Subthreshold sodium current was larger and subthreshold Ih was smaller in mouse neurons than in rat neurons. Overall, the results show opposing effects of subthreshold sodium current and Ih in regulating subthreshold behavior of CA1 neurons, with subthreshold sodium current prominent in both rat and mouse CA1 pyramidal neurons and additional regulation by Ih in rat neurons.

scholarly journals A STUDY ON DYNAMIC CH AMIC CHARACTERISTICS OF A NEW REMO TERISTICS OF A NEW REMOTE TRANSFORMER CURRENT CONVERTER WITHOUT COMPENSA COMPENSATING CAP TING CAPACITOR

2021 ◽  
Vol 2021 (3) ◽  
pp. 32-40
Author(s):  
Аmirov Sultan ◽  
◽  
Nargisa Babanazarova ◽  
Nurilla Yuldashev ◽  
◽  
...  
Keyword(s):  
Time Constant ◽  
Transient Response ◽  
Magnetic Circuit ◽  
Monitoring And Control ◽  
Secondary Circuit ◽  
Idle Mode ◽  
Current Converter ◽  
Monitoring And Control Systems ◽  
And Control ◽  
Primary Current

In this research paper, analytical equations of the transient characteristics of a new remote transformer current converter without a compensating capacitor have been obtained when a stepwise, linearly increasing, sinusoidal and sinusoidal with a damped amplitude of effects was applied to their input. It has been shown that the developed current converter can be represented in the structural schemes of monitoring and control systems in the form of a series-connected real ifferentiating link without statism and inertial (aperiodic) link of the first order, and in the case of neglecting active losses in the magnetic circuit and when the converter is operating in idle mode, i.e in the form of ideal differentiating link.It has been established that the transient response of the developed current transducer has an aperiodic character when a surge primary current is fed to its input, and with a relatively very large value of the time constant of the secondary circuit compared to the time constant of the magnetic circuit, transient response approaches transient response of a real differentiating link.

A Universal Modular Hybrid LDO With Fast Load Transient Response and Programmable PSRR in 14-nm CMOS Featuring Dynamic Clamp Strength Tuning

2021 ◽  
pp. 1-1
Author(s):  
Xiaosen Liu ◽  
Harish K. Krishnamurthy ◽  
Taesik Na ◽  
Sheldon Weng ◽  
Khondker Z. Ahmed ◽  
...  
Keyword(s):  
Transient Response ◽  
Dynamic Clamp
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