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input-impedance-matching
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Wideband LNA using active inductor with multiple feed-forward noise reduction paths
, Article IEEE Transactions on Microwave Theory and Techniques ; Volume 60, Issue 4 , 2012 , Pages 1069-1078 ; 00189480 (ISSN) ; Sharif Bakhtiar, M ; Sharif University of Technology
2012
Abstract
In this paper, an area-efficient LNA with on-chip input matching circuit utilizing an active inductor is presented. The active inductor is implemented based on the gyrator structure and its noise is improved by employing a feed-forward path (FFP). The overall low-noise performance of the LNA is achieved by cancelling the inductor noise through an additional FFP. It is shown that the proposed LNA circuit is capable of achieving low-noise performance with wideband tuning at the input in a small die area. A 0.32- to 1-GHz LNA has been designed and fabricated in a standard 0.18-μm CMOS technology. The LNA occupies a die area of less than 0.1 mm 2. The measured results show noise figure of...
Wideband 1-30 GHz Low Noise Amplifier Design with Input Impedance Matching Circuit
, M.Sc. Thesis Sharif University of Technology ; Fakharzadeh Jahromi, Mohammad (Supervisor)
Abstract
With the expansion of wireless communication technology and the advent of the fifth generation of mobile communication, there is a growing need for broadband systems. Consequently, RF engineers are currently focusing their attention on broadband transceiver systems. The low noise amplifier (LNA) is a critical component in the receiver of a telecommunication system. In this research, the design of a broadband LNA in the K and Ka frequency band (18 ~ 40 GHz) is presented. The main challenge in designing a broadband LNA lies in achieving simultaneous power matching and noise matching through the input impedance matching network. Various types of broadband impedance matching networks have been...
Noise Analysis and LNA Design in Microwave Band
, M.Sc. Thesis Sharif University of Technology ; Medi, Ali (Supervisor)
Abstract
In recenet years the use of microwave integrated circuits for military and commercial applications has gained much more attention. The advent of monolithic microwave integrated circuits, which provide the possibility of fabrication of amplifiers in large number, sufficient accuracy an affordable price has accelerated this process. Low noise amplifiers as the first blocks in the receiver modules are such circuits that are highly regarded in this field. This block is a key block in the receiver which its noise figure and gain directly affect the sensitivity and dynamic range of the receiver. As a result, a low noise amplifier with low noise figure, high gain, good return loss, low power...
Design of a printed non-planar dual-polarised log-periodic dipole array
, Article IET Microwaves, Antennas and Propagation ; Volume 11, Issue 4 , 2017 , Pages 490-494 ; 17518725 (ISSN) ; Ahmadi Boroujeni, M ; Arbabi, E ; Mohammadpour Aghdam, K ; Sharif University of Technology
Abstract
An efficient and low cost approach to realise a non-planar dual-polarised log-periodic dipole array antenna (LPDA) using printed circuit board technology is proposed which achieves a high bandwidth and operational frequency. The proposed antenna utilises a very short transition from a coaxial cable to a balanced four-conductor transmission line to realise an ultra-wide bandwidth balun and input impedance matching. An analysis of the utilised four-conductor transmission line alongside its comparison to two-conductor transmission line of a planar LPDA is also presented. Two prototypes of the antenna operating over the frequency ranges of 1-13 GHz and 1-18 GHz were designed, fabricated, and...
Analysis and design of multi-stage wideband LNA using simultaneously noise and impedance matching method
, Article Microelectronics Journal ; Volume 86 , 2019 , Pages 97-104 ; 00262692 (ISSN) ; Medi, A ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
An analytical approach for design optimization of multi-stage LNAs with common source topology is developed. This paper reviews and analyses simultaneous noise and input impedance matching in three different topologies including common source amplifier with inductive degeneration, resistive feedback and dual feedback in order to achieve maximum available gain and minimum possible noise figure (NF). A study on multi-stage LNAs is performed to calculate optimum input impedance of each stage for minimum overall NF while considering the gain and NF of that stage in addition to the effect of noise of the following stages. MATLAB was used to calculate the starting point of design optimization in a...