Low voltage and low frequency current mirror using a two-MOS subthreshold OP-Amp

1996 ◽  
Vol 32 (7) ◽  
pp. 605 ◽  
Author(s):  
K. Tanno ◽  
O. Ishizuka ◽  
Z. Tang
Keyword(s):  
Low Voltage ◽  
Low Frequency ◽  
Current Mirror ◽  
Op Amp ◽  
Frequency Current

scholarly journals Design and PVT Analysis of Robust, High Swing Folded Cascode Operational Amplifier

2019 ◽  
Vol 9 (2) ◽  
pp. 114-118
Keyword(s):  
Power Dissipation ◽  
Operational Amplifier ◽  
Low Voltage ◽  
Cmos Technology ◽  
Current Mirror ◽  
Op Amp ◽  
Multistage Amplifiers ◽  
Pvt Variations ◽  
Folded Cascode ◽  
Voltage Swing

The folded cascode operational amplifier (FCOA) designed in this paper is the single-pole operational amplifier (op amp). In this design, the conventional current mirror is replaced with wide swing current mirror to overcome the essential drawback of cascode configuration. In this paper, negative feedback is used to improve the small-signal gain and to ensure better stability than multistage amplifiers. This paper also aims at improving the output voltage swing, power dissipation and robustness of the op amp. The designed FCOA is proficient in achieving 67.44dB gain and 1.77V output swingat typical voltage for 180nm CMOS technology. The FCOA is highly stable with phase margin of 62.58º while dissipating 0.5mW power. This amplifier is further verified for variability analysis for Process, Voltage and Temperature (PVT) variations to check robustness. All together testing is done at 45 different PVT combinations and results are tabulated accordingly. At each corner temperature and voltage are varied for all together nine combinations to properly address the effect of PVT variations. The results shows that the op amp exhibits desired response at four corners (FF, TT, SS, and FS) of process, over -40º to 125º C temperature range. Also it is capable of operating at very low voltage up to 0.9V adequately showing reduction in power dissipation. Thus the designed op amp is low power, high swing and robust towards process, voltage and temperature variations.

Fault Detection for Low-Voltage Residential Distribution Systems With Low-Frequency Measured Data

2020 ◽  
Vol 14 (4) ◽  
pp. 5265-5273
Author(s):  
Mehdi Shafiei ◽  
Faranak Golestaneh ◽  
Gerard Ledwich ◽  
Ghavameddin Nourbakhsh ◽  
Hoay Beng Gooi ◽  
...  
Keyword(s):  
Fault Detection ◽  
Distribution Systems ◽  
Low Voltage ◽  
Low Frequency ◽  
Measured Data ◽  
Residential Distribution

scholarly journals Low-frequency current variability at the Straits of Crete, eastern Mediterranean

1997 ◽  
Vol 102 (C11) ◽  
pp. 25005-25020 ◽  
Author(s):  
M. N. Tsimplis ◽  
A. F. Velegrakis ◽  
A. Theocharis ◽  
M. B. Collins
Keyword(s):  
Eastern Mediterranean ◽  
Low Frequency ◽  
Frequency Current

Intermittency in low frequency current oscillations in semi-insulating GaAs

2003 ◽  
Vol 17 (2-3) ◽  
pp. 249-253 ◽  
Author(s):  
V. Samuilov ◽  
T. Veselova ◽  
A. Cenys ◽  
K.G. Kyritsi ◽  
A.N. Anagnostopoulos ◽  
...  
Keyword(s):  
Low Frequency ◽  
Current Oscillations ◽  
Frequency Current

scholarly journals Novel neuronal and astrocytic mechanisms in thalamocortical loop dynamics

2002 ◽  
Vol 357 (1428) ◽  
pp. 1675-1693 ◽  
Author(s):  
Vincenzo Crunelli ◽  
Kate L. Blethyn ◽  
David W. Cope ◽  
Stuart W. Hughes ◽  
H. Rheinallt Parri ◽  
...  
Keyword(s):  
Low Voltage ◽  
Electrical Coupling ◽  
Low Frequency ◽  
Network Activity ◽  
Thalamic Neuron ◽  
Cellular Mechanisms ◽  
Brain Areas ◽  
Sensory Stimuli ◽  
Loop Dynamics ◽  
Intracellular Ca

In this review, we summarize three sets of findings that have recently been observed in thalamic astrocytes and neurons, and discuss their significance for thalamocortical loop dynamics. (i) A physiologically relevant ‘window’ component of the low–voltage–activated, T–type Ca 2+ current ( I Twindow ) plays an essential part in the slow (less than 1 Hz) sleep oscillation in adult thalamocortical (TC) neurons, indicating that the expression of this fundamental sleep rhythm in these neurons is not a simple reflection of cortical network activity. It is also likely that I Twindow underlies one of the cellular mechanisms enabling TC neurons to produce burst firing in response to novel sensory stimuli. (ii) Both electrophysiological and dye–injection experiments support the existence of gap junction–mediated coupling among young and adult TC neurons. This finding indicates that electrical coupling–mediated synchronization might be implicated in the high and low frequency oscillatory activities expressed by this type of thalamic neuron. (iii) Spontaneous intracellular Ca 2+ ([Ca 2+ ] i ) waves propagating among thalamic astrocytes are able to elicit large and long–lasting N –methyl–D–aspartate–mediated currents in TC neurons. The peculiar developmental profile within the first two postnatal weeks of these astrocytic [Ca 2+ ] i transients and the selective activation of these glutamate receptors point to a role for this astrocyte–to–neuron signalling mechanism in the topographic wiring of the thalamocortical loop. As some of these novel cellular and intracellular properties are not restricted to thalamic astrocytes and neurons, their significance may well apply to (patho)physiological functions of glial and neuronal elements in other brain areas.

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