Querying the Validity of Small-Signal Amplifier Conception

2012 ◽  
Vol 433-440 ◽  
pp. 2774-2779
Author(s):  
Zeng Min Yuan ◽  
Xu Jin Yuan
Keyword(s):  
Negative Feedback ◽  
Input Signal ◽  
Output Voltage ◽  
Small Signal ◽  
Signal Source ◽  
Output Resistance ◽  
Signal Amplifier ◽  
Extent Condition

Signal source output resistance and negative feedback resistance all contribute to restrain transistor non-linearity and improve amplifier linearity. Amplifier sine output voltage and transistor emitting junction non-sine voltage coexist. Transistor emitting junction non-sine voltage is a by-product and doesn’t affect amplifier function. It was proved by experiment and in theory that the input signal magnitude in the basic common-emitter amplifier is not limited with small signal extent condition Ubem≤10mV, and output range is not limited with Ubem≤10mV. It was proved that small signal amplifier conception does not accord with the facts and might be not suitable.

135GHz CMOS small-signal amplifier with power-efficient bias method

2013 ◽  
Author(s):  
Mizuki Motoyoshi ◽  
Kyoya Takano ◽  
Kosuke Katayama ◽  
Minoru Fujishima
Keyword(s):  
Small Signal ◽  
Power Efficient ◽  
Signal Amplifier

LOW-NOISE SMALL-SIGNAL AMPLIFIER

1963 ◽  
Author(s):  
D. NEUF ◽  
P. LOMBARDO
Keyword(s):  
Low Noise ◽  
Small Signal ◽  
Signal Amplifier

Development of Robust Excitation Controller for Synchronous Generator

2014 ◽  
Vol 573 ◽  
pp. 328-333
Author(s):  
R. Ramya ◽  
K. Selvi ◽  
M. Tamilvanan
Keyword(s):  
Output Voltage ◽  
Closed Loop ◽  
Synchronous Generator ◽  
Local Mode ◽  
Small Signal ◽  
Closed Loop System ◽  
Robust Controller ◽  
Sensitivity Approach ◽  
Single Machine Infinite Bus ◽  
The Stability

This paper deals with the design and evaluation of robust excitation controller for a single-machine infinite-bus power system. The design of the regulator guarantees the stability of the closed loop system and ensures the output voltage is maintained within an acceptable threshold. In addition, it damps out local mode oscillations for small signal disturbances. The designed robust controller is also analyzed under change in step input and disturbance, which limits the heavy oscillations on the speed ω and voltage. Glover-McFarlane loop shaping algorithm is applied in designing the robust excitation controller. Two different techniques such as Optimal control and mixed sensitivity approach is used in this paper. The performance of the AVR was analyzed and compared with IEEE type2 Exciter.

Study on Electrical Automation with Design of Programmable Control Voltage/Current Source

2013 ◽  
Vol 703 ◽  
pp. 273-277
Author(s):  
Yu Wen Zhai ◽  
Wei Liu ◽  
Xiao Yang
Keyword(s):  
Current Source ◽  
Control Voltage ◽  
Signal Source ◽  
Digital Display ◽  
Dc Voltage ◽  
Standard Signal ◽  
Signal Amplifier ◽  
Dc Current

The design of programmable control voltage/current source based on MCU C8051F410 is introduced. The system mainly consists of D/A converter with PWM, voltage/current conversion circuit and digital display circuit. It can provide with DC voltage within the ranges of 0 to 200mV, 0 to 2V, -10V to +10V; and provide with DC current within the range of 4 to 20 mA. The programmable control voltage/current source can be used as the standard signal source for thermodynamic instrumentation, especially for the adjusting and testing for ADC or precise litter signal amplifier in the field of electrical automation.

scholarly journals Average and Small Signal Modeling of Negative-Output KY Boost Converter in CCM Operation

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Faqiang Wang ◽  
Jing Li ◽  
Xikui Ma
Keyword(s):  
Output Voltage ◽  
Averaging Method ◽  
Transfer Functions ◽  
Boost Converter ◽  
Small Signal ◽  
Signal Model ◽  
Boost Converters ◽  
Small Signal Model ◽  
Small Signal Modeling ◽  
Negative Output

Negative-output KY Boost converter, which can obtain the negative output voltage and could be driven easily, is a good topology to overcome traditional Boost and Buck-Boost converters and it is believed that this converter will be widely used in engineering applications in the future. In this study, by using the averaging method and geometrical technique, the average and small signal model of the negative-output KY Boost converter are established. The DC equilibrium point and transfer functions of the system are derived and analyzed. Finally, the effectiveness of the established model and the correctness of the theoretical analysis are confirmed by the circuit experiment.

scholarly journals Basic Characteristics of IEC Flickermeter Processing

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Jarosław Majchrzak ◽  
Grzegorz Wiczyński
Keyword(s):  
Input Signal ◽  
Standard Test ◽  
Signal Frequency ◽  
Signal Source ◽  
Short Term ◽  
Voltage Fluctuations ◽  
Input Signal Frequency ◽  
A Value ◽  
Bandwidth Limitation ◽  
Basic Characteristics

Flickermeter is a common name for a system that measures the obnoxiousness of flicker caused by voltage fluctuations. The output of flickermeter is a value of short-term flicker severity indicator, . This paper presents the results of the numerical simulations that reconstruct the processing of flickermeter in frequency domain. With the use of standard test signals, the characteristics of flickermeter were determined for the case of amplitude modulation of input signal, frequency modulation of input signal, and for input signal with interharmonic component. For the needs of simulative research, elements of standard IEC flickermeter signal chain as well as test signal source and tools for acquisition, archiving, and presentation of the obtained results were modeled. The results were presented with a set of charts, and the specific fragments of the charts were pointed out and commented on. Some examples of the influence of input signal’s bandwidth limitation on the flickermeter measurement result were presented for the case of AM and FM modulation. In addition, the diagrams that enable the evaluation of flickermeter’s linearity were also presented.

scholarly journals A New Buck-Boost AC/DC Converter with Two-Terminal Output Voltage for DC Nano-Grid

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3808 ◽  
Author(s):  
Xiangkun Li ◽  
Weimin Wu ◽  
Houqing Wang ◽  
Ning Gao ◽  
Henry Shu-hung Chung ◽  
...  
Keyword(s):  
Steady State ◽  
Output Voltage ◽  
Operating Principle ◽  
Small Signal ◽  
Grid System ◽  
Power Sources ◽  
Steady State Analysis ◽  
Dc Power ◽  
Signal Modelling ◽  
Conduction Mode

Due to the development and deployment of renewable DC power sources and their inherent advantages for DC loads in applications, the DC nano-grid has attracted more and more research attentions; especially the topologies of AC/DC converters are increasingly studied. When designing an AC to DC converter for a DC nano-grid system, the grounding configuration, which determines the costs, the efficiency as well as the safety, plays an important role. A three-terminal output AC to DC converter based on united grounding configuration has been presented for DC nano-grid. However, it has to be pointed out that the three-terminal output DC nano-grid is not as popular as the two-terminal DC output one, due to the infrastructure consideration. This paper proposes a new Buck-Boost AC to DC converter with two-terminal output voltage for DC nano-grid. The operating principle, the steady-state analysis, and the small signal modelling for the proposed converter working in continuous conduction mode are presented in detail. A 220 V/50 Hz/800 W prototype was fabricated to verify the effectiveness of the proposed converter.

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