A Study on High Precision and High Stability Digital Magnet Power Supply Using Second Order Delta-Sigma modulation

2015 ◽  
Vol 29 (3) ◽  
pp. 69-80
Author(s):  
Kum-Su Kim ◽  
Kil-Jin Jang ◽  
Dong-Hee Kim
Keyword(s):  
High Precision ◽  
Power Supply ◽  
High Stability ◽  
Second Order ◽  
Delta Sigma ◽  
Delta Sigma Modulation

Design of High Precision Power Supply for Low-Frequency Vibration Cutting

2004 ◽  
Vol 471-472 ◽  
pp. 494-497
Author(s):  
X.G. Jiang ◽  
D.Y. Zhang
Keyword(s):  
Power Amplifier ◽  
High Precision ◽  
Frequency Band ◽  
Power Supply ◽  
High Stability ◽  
Low Frequency ◽  
Sine Wave ◽  
Vibration Cutting ◽  
Low Frequency Vibration ◽  
Small Band

The frequency of piezoelectric transducer requires high stability and can also be continuously changed. The voltage requires smooth and stable sine wave. To the two problems, a high precision power supply for vibration cutting is designed. It divides the whole frequency band into several small bands. By means of CPLD, the sine wave is digitally fitted individually at each small band. So the sine wave can be always suitable at a wide frequency band. At the power output, OCL power amplifier is adopted. The output sine voltage becomes smooth and stable by adding voltage negative feedback to the power amplifier. The experiment results show its feasibility.

1-bit Feedforward Distortion Compensation Technology for Bandpass Delta-Sigma Modulation

2016 ◽  
Vol E99.B (5) ◽  
pp. 1087-1092 ◽  
Author(s):  
Takashi MAEHATA ◽  
Suguru KAMEDA ◽  
Noriharu SUEMATSU
Keyword(s):  
Distortion Compensation ◽  
Delta Sigma ◽  
Delta Sigma Modulation

Stability of radical anions derived from substituted 5-nitrofurans investigated by ESR spectroscopy

1985 ◽  
Vol 50 (7) ◽  
pp. 1594-1601 ◽  
Author(s):  
Jiří Klíma ◽  
Larisa Baumane ◽  
Janis Stradinš ◽  
Jiří Volke ◽  
Romualds Gavars
Keyword(s):  
Radical Anion ◽  
High Stability ◽  
Esr Spectroscopy ◽  
Reaction Path ◽  
Order Reaction ◽  
Second Order ◽  
Radical Anions ◽  
Second Order Reaction ◽  
Unpaired Electron Density ◽  
The Stability

It has been found that the decay in dimethylformamide and dimethylformamide-water mixtures of radical anions in five of the investigated 5-nitrofurans is governed by a second-order reaction. Only the decay of the radical anion generated from 5-nitro-2-furfural III may be described by an equation including parallel first- and second-order reactions; this behaviour is evidently caused by the relatively high stability of the corresponding dianion, this being an intermediate in the reaction path. The presence of a larger conjugated system in the substituent in position 2 results in a decrease of the unpaired electron density in the nitro group and, consequently, an increase in the stability of the corresponding radical anions.

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