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مرکز اطلاعات علمی SID1
اسکوپوس
مرکز اطلاعات علمی SID
ریسرچگیت
strs
Issue Info: 
  • Year: 

    2020
  • Volume: 

    50
  • Issue: 

    1 (91)
  • Pages: 

    31-40
Measures: 
  • Citations: 

    0
  • Views: 

    167
  • Downloads: 

    187
Abstract: 

In this paper an ultra-low power two stage improved operational trans_conductance AMPLIFIER based on folded cascode is designed. The proposed operational trans_conductance AMPLIFIER operates in weak inversion region. The use of two folded branches in the signal amplification path for the first stage and the new feed_forward compensation path with low bias CURRENT on the second stage in this proposed AMPLIFIER increases the DC gain, unity gain frequency, slew rate and decreases the input referred noise. The simulation results in a TSMC 0. 18μ m CMOS technology it shows that the proposed operational trans_conductance AMPLIFIER has unity gain bandwidth of 117 KHz, and consumes 195 nW power from a 0. 6 V supply voltage with DC gain of 101. 4 dB.

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Issue Info: 
  • Year: 

    2014
  • Volume: 

    3
  • Issue: 

    1
  • Pages: 

    1-12
Measures: 
  • Citations: 

    0
  • Views: 

    64405
  • Downloads: 

    13975
Abstract: 

In this paper, analysis, simulation and design of a distributed AMPLIFIER (DA) with 0.13mm CMOS technology in the frequency range of 3-40 GHz is presented. Gain cell is a CURRENT reused circuit which is optimum in gain, noise figure, bandwidth and also power dissipation. To improve the noise performance in the frequency range of interest, a T-matching low pass filter LC network is utilized at the input gate of the designed AMPLIFIER. By this means, the proposed cascaded DA shows about 28% improvements in noise figure and 20% improvement in the gain compared with those of the other well-known configuration. To show the capability of the proposed method we also compared the figure of merit of the proposed AMPLIFIER with those obtained with the other researches and showed that this figure is around 38% higher than that of those achieved by other researchers. The figure of merit includes gain, bandwidth, power consumption and also noise figure.

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Issue Info: 
  • Year: 

    2021
  • Volume: 

    51
  • Issue: 

    1 (95)
  • Pages: 

    49-60
Measures: 
  • Citations: 

    0
  • Views: 

    2970
  • Downloads: 

    3715
Abstract: 

An integrated CMOS, low-power optical communication receiver front-end is designed and presented in this paper for specified applications of 10Gbp/s. The transimpedance AMPLIFIER (TIA) stage and the limiting AMPLIFIER (LA) stage possess an active feedforward network based on CURRENT-mirror topologies and differential topologies, respectively. In order to obtain broadband performance, low-power consumption characteristic and low-occupied area on chip, an active type of inductors are employed in the TIA as well as the LA stage. The performance of the optical system is simulated using 90 Nano-meter CMOS technology parameters, which exhibits power dissipation of only 1. 5mW,-3dB frequency of 6. 92GHz, 24pA/√ Hz input referred noise, and transimpedance gain of 40. 1dB ohm for the TIA stage, while, the whole optical receiver front-end consumes 7. 7m Watt, providing 71. 4dB ohm gain beside acquiring 6. 55GHz frequency bandwidth. Finally, the performance of the presented optical receiver front-end as a low-power, 10Gbps block-diagram is justified.

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گارگاه ها آموزشی
Author(s): 

Ahmadi S. | Azhari S.J.

Issue Info: 
  • Year: 

    2019
  • Volume: 

    16
  • Issue: 

    4
  • Pages: 

    279-284
Measures: 
  • Citations: 

    0
  • Views: 

    1761
  • Downloads: 

    360
Abstract: 

In this paper a novel topology of CMIA based on FDCCII is proposed. Due to benefiting from CURRENT mode signal processing, unlike the most of the previously reported IAs, the proposed FDCCII based structure doesn't need well-matched resistors or active blocks to obtain high CMRR and inherently can improve CMRR, bandwidth, power consumption and it has better frequency performances. On the other side, unlike other CURRENT mode types of this group, using fully differential structure decreases the mismatch effect in electronic blocks. Both of these advantages significantly reduced the structure size and power consumption while improving bandwidth and CMRR and makes it an excellent and an unbeatable choice for integration. In the proposed circuit, CMRR as the most important property of IA has been greatly improved by using a CURRENT subtracting stage. The CMIA has been designed using 0. 18 um CMOS Technology under ± 1 V supply voltages and the performance of the CMIA has been verified using HSPICE software in transistor level. The CMIA has achieved voltage CMRR of 227. 4 dB, voltage CMRR bandwidth of 8. 98 KHz, differential voltage gain bandwidth of 9. 08 MHz and output offset voltage of 2. 23 uV and the IA’ s power dissipation is only 348 uW.

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Author(s): 

rezaei a.r. | cheraghi z.

Journal: 

JOURNAL OF RADAR

Issue Info: 
  • Year: 

    2018
  • Volume: 

    5
  • Issue: 

    4
  • Pages: 

    39-48
Measures: 
  • Citations: 

    0
  • Views: 

    476
  • Downloads: 

    268
Keywords: 
Abstract: 

This article describes the first stage in designing and realizing three 100W C-band power AMPLIFIER alternatives based on the GaAs-technology for use in TT&C-transmitters. The operational frequency range spanned from 4. 3GHz to 4. 5GHz. A Gysel power divider was used to feed each branch in the second stage. The AMPLIFIERs were capable of delivering 100W output power. This distributed design of the microwave SSPA results in built in redundancy and graceful degradation of output power should any individual PA section fail. Each branch includes a CURRENT sense alarm indication which is monitored and fed to the RF SSPA controller. The amplified outputs of all the symmetric branches are summed up in a passive combing network which routes the resultant high power to the output of the RF SSPA.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    1
  • Issue: 

    2
  • Pages: 

    17-23
Measures: 
  • Citations: 

    0
  • Views: 

    533
  • Downloads: 

    255
Abstract: 

Thermal effects induced in Nd: Glass laser disks after optical pumping, have been studied by means of an optical interferometer. For this mean, two configurations with seven and one laser disks at Brewster angle pumped with four flash lamps and a total charging energy 3.1 kJ and 1.8 kJ, respectively. The investigation of interferometer fringes indicated that three regions exist in time domain: vibration and radiation absorption until the ending of optical pumping, vibration and heat conduction until ceasing of  mechanical vibration generated from  the flash lamps shock waves, and finally, disks heating and cooling by convection and conduction mechanisms. The regions terminate 1 ms, 10 ms and at least 1 minute after initiation of the flash lamps discharge CURRENT. The first region, depends on the flash lamps discharge circuit, and for the two other regions, vibration and heating are the main mechanisms which depend on thermal properties of the glass disks, installation techniques and cooling.

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strs
Issue Info: 
  • Year: 

    2021
  • Volume: 

    8
  • Issue: 

    2 (21)
  • Pages: 

    33-43
Measures: 
  • Citations: 

    0
  • Views: 

    21765
  • Downloads: 

    19588
Abstract: 

Different factors such as nonlinear phenomena and mode instability affect the output of the high-power fiber lasers and AMPLIFIERs. Since these devices have many applications in the industry, medicine, and military facilities, the study of the various factors’ effects on their output is directly reflected on the design of high-power lasers and AMPLIFIERs. In the present paper, the mode instability which is the major limiting factor on the output of high power lasers and AMPLIFIERs has been studied, simulated, and investigated. In these high-power devices, the temperature increases due to quantum defects, background loss, and light scattering, which change the refractive index of the fiber material. Variation of the refractive index is the main reason of mode instability in high power fiber lasers and AMPLIFIERs. Mode instability causes the coupling of the fundamental mode to the upper-mode and thus decreases the fundamental mode’ s energy. In this paper, different factors that affect the threshold of the mode instability and power transfer from the fundamental mode to the upper mode have been investigated.

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Journal: 

ELECTRONIC INDUSTRIES

Issue Info: 
  • Year: 

    2016
  • Volume: 

    7
  • Issue: 

    3
  • Pages: 

    77-89
Measures: 
  • Citations: 

    0
  • Views: 

    1035
  • Downloads: 

    356
Abstract: 

To have both high efficiency and linearity in power AMPLIFIERs linearization techniques should be used. One structure with the ability of cancelling the inherent limitations of the LINC linearization techniques is proposed in this article. The gain and phase imbalances in LINC technique has been compensated using optimization algorithms. According to the analysis a feedback path has been added in the conventional LINC transmitter that calibrates any phase and gain mismatches adaptively; using optimization algorithms. Many simulations have been performed to validate the structure functionality and extracted relations. In this paper M68749 power AMPLIFIER is used at 390MHz frequency with output power of 5 watt. Simulations show that power spectral density of proposed architecture has 40dB/Hz improvement in spreading to adjacent channels.

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Author(s): 

ZHUO W. | LI X. | SHEKHAR S.H.K.

Issue Info: 
  • Year: 

    2005
  • Volume: 

    54
  • Issue: 

    12
  • Pages: 

    875-879
Measures: 
  • Citations: 

    744
  • Views: 

    17335
  • Downloads: 

    13879
Keywords: 
Abstract: 

Yearly Impact:

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Author(s): 

MIRJALILI B. | BAMONIRI A.

Issue Info: 
  • Year: 

    2004
  • Volume: 

    17
  • Issue: 

    3 (TRANSACTIONS A: BASICS)
  • Pages: 

    0-0
Measures: 
  • Citations: 

    0
  • Views: 

    56943
  • Downloads: 

    24092
Abstract: 

A novel technique for a self-equalized distributed AMPLIFIER is presented by showing the analogy between transversal filters and distributed AMPLIFIER topologies. The appropriate delay and gain coefficients of AMPLIFIER circuit are obtained by a Fourier expansion of the raised cosine spectrum in the frequency range of 0-40GHz.

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