On Design and Performance of Lossy Match GaAs MESFET Amplifiers

Niclas, K.B.

doi:10.1109/tmtt.1982.1131341

Cited by 34 publications

(14 citation statements)

References 10 publications

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“…Three main techniques have been proposed: (i) the matchedfeedback amplifier, (ii) the lossy equalised amplifier, and (iii) the distributed amplifier. It is not clear which amplifier shows the best performance since all of them are compact and simple to construct [5,6]. However, the final aim of integrating the amplifier in an antenna and equalising the antenna impedance at the same time has led us to propose the lossy-equalised-amplifier technique as the most suitable.…”

Section: Resistive Equalized Broadband Amplifiermentioning

confidence: 99%

“…Conventional implementation of the MoM requires an O(N 3 ) operation and O(N 2 ) computermemory storage. Two fast numerical methods have been used: the sparse-matrix canonical-grid method (SMCG) [1][2][3][4] and the fastmultipole method (FMM) [5,6]. Recently, a characteristic basis function was also used to solve volume-scattering problems [7].…”

Section: Introductionmentioning

confidence: 99%

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An active broadband‐transmitting patch antenna for GSM‐1800 and UMTS

Segovia-Vargas

González-Posadas

Vázquez

et al. 2004

Micro & Optical Tech Letters

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This paper presents an active broadband‐transmitting patch antenna, which works in the 1650–2300‐MHz band to provide GSM‐1800 and UMTS services. An increase of the reflection bandwidth of the referenced passive antenna has been achieved due to the resistively equalized broadband‐amplifying active antenna. An increase in equivalent isotropic radiated power (EIRP) of 11–12 dB compared to the passive antenna, with a ripple lower than ±0.5 dB, has also been achieved. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 350–354, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20139

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Section: Resistive Equalized Broadband Amplifiermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An active broadband‐transmitting patch antenna for GSM‐1800 and UMTS

Segovia-Vargas

González-Posadas

Vázquez

et al. 2004

Micro & Optical Tech Letters

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“…Less than 100 K NAG Library optimisation program 6 One of the authors (K. Anvari) would like to thank the University of Leicester, and especially Professor G.D.S. MacLellan, Head of the Department of Engineering, for the use of the facilities of the University during his visit between October 1984 and March 1985.…”

Section: Program Detailsmentioning

confidence: 99%

“…Among the various amplifier configurations available, single-ended amplifiers using parallel or series feedback and lossy matching networks appear to have been the most popular. A number of analytical design techniques for single-ended amplifiers [2][3][4][5] with or without lossy equalisers [5,6] have been reported. Despite the fact that application of conventional matching network theory simplifies these techniques, a good design requires considerable network synthesis, or trial and error using the Smith chart, even though computer optimisation [7] is used.…”

Section: Introductionmentioning

confidence: 99%

Computer-aided design of microwave amplifiers by the random addition of new components

Anvari

Fuller

1986

IEE Proc. H Microw. Antennas Propag. UK

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A new technique for the optimisation of microwave transistor amplifiers has been developed, whereby the computer program removes components or adds new components and nodes to the circuit, in a systematic but apparently random manner, in order to approach specified performance targets. Although the assessment of a large number of possible alternative circuits consumes a large amount of computer time, two examples show that acceptable circuits are produced with very little operator interaction. The program optimises for gain, noise figure, input and output VSWR and stability. It is suitable for integrated circuit design. Examples are given of a single-stage amplifier with feedback and a two-stage amplifier with lossy matching networks but without feedback operating over the frequency band 8-12 GHz.

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“…In order for the amplifier to be absolutely stable for an arbitrary passive load impedance, it is required that K t 1 and |'| < 1 (where ' = S 11 S 22 S 12 S 21 ) [26]. When a conditionally stable amplifier is designed under the condition K < 1, there are the following techniques: 1 The active device is terminated with an impedance located in the stable region instead of a conjugate match [7,8], and 2 with a resistive load or a negative feedback, the amplifier is designed in such a way that the stability factor is K t 1 and |'| < 1 [9,10]. In method 1 , the return loss is degraded, while in method 2 the gain, noise figure, and output characteristic are degraded.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of millimeter‐wave multistage amplifier using amplitude‐and‐phase setting circuits

Uchida

Nakahara

Takeuchi

et al. 2001

Electron Comm Jpn Pt II

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SUMMARYThis paper derives the conditions to be satisfied by the amplifier in each stage of a multistage amplifier in order for it to be absolutely stable. It is shown that the stability factor K of each stage need not be larger than unity except for the initial and last stages. By means of this condition, it is possible to improve the gain in comparison to the conventional method in which the amplifiers in all stages are made K > 1 and then are cascaded. In the millimeter wave range, where device performance deteriorates, the gain reduction due to stable design is significant. Therefore, the present conclusion is extremely effective for the design of multistage amplifiers in the millimeter wave range. Further, in this paper, a new design method is presented that assures absolute stability of a multistage amplifier that consists of unit amplifiers, each of which has a stability factor K of less than 1. In this method, an amplitude-and-phase setting circuit consisting of transmission lines and resistors is connected at the output of each stage and the transmission amplitude and phase are adjusted in such a way that the stability condition derived in this paper is satisfied. It is shown that there exists an optimum transmission phase maximizing the gain of the multistage amplifier. Finally, the proposed method is applied to the design of a U-band four-stage low-noise amplifier. © 2001 Scripta Technica, Electron Comm Jpn Pt 2, 84(12): 2636, 2001

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On Design and Performance of Lossy Match GaAs MESFET Amplifiers

Cited by 34 publications

References 10 publications

An active broadband‐transmitting patch antenna for GSM‐1800 and UMTS

An active broadband‐transmitting patch antenna for GSM‐1800 and UMTS

Computer-aided design of microwave amplifiers by the random addition of new components

Stabilization of millimeter‐wave multistage amplifier using amplitude‐and‐phase setting circuits

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