The Enhanced Power Performance of the Dual-Fed Distributed Amplifier

Aitchison, C.S.; Bukhari, M N; Tang, O.S.A.

doi:10.1109/euma.1989.334002

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…There is no idle gate and drain line terminations in the DFDA, which are the bane of gain and efficiency of the CDA. Early investigations of the DFDA have demonstrated its gain [6] and efficiency [7], [8] advantages over the CDA. The gain of the DFDA is maximized when 180 hybrids are used [9].…”

Section: Introductionmentioning

confidence: 99%

Compact dual-fed distributed power amplifier

Eccleston

2005

IEEE Trans. Microwave Theory Techn.

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Abstract-The dual-fed distributed amplifier (DFDA) allows efficient combining of field-effect transistors (FETs) at the device level without using -way power combiners. However, the FETs must be spaced 180 , resulting in physically large circuits. In this paper, meandered artificial transmission lines (TLs) comprised of microstrip lines periodically loaded with short open-circuit stubs can be used in place of TLs to reduce the size. The approach incorporates FET input and output capacitances with the artificial TLs, thereby eliminating their detrimental effects on bandwidth and performance. Both simulation and experimental results of a class-A three-FET single-ended DFDA designed to operate at 1.8 GHz demonstrate the feasibility of this approach and the validity of the design method. The size reduction is approximately one-third compared to realization using microstrip lines only, and the maximum efficiency is greater than 35% over a bandwidth of 15%.Index Terms-Distributed amplifiers, microstrip circuits, microwave field-effect transistor (FET) amplifiers, microwave power FET amplifiers.

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Section: Introductionmentioning

confidence: 99%

Compact dual-fed distributed power amplifier

Eccleston

2005

IEEE Trans. Microwave Theory Techn.

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“…In similar manner, by adjusting the termination impedance at the drain line, the efficiency is maximized over the entire bandwidth. If in linear conditions super-position is applied [14], it follows that the output due to forward gain from the left to right gate input signal appears at the right hand drain port and similarly the output due to forward gain from the right to the left gate input signal appears at the left hand gain port [15]. These two output signals can be combined to give the total output power.…”

Section: Analysis Of Dual Fed Da With Termination Adjustmentmentioning

confidence: 99%

Dual Fed Distributed Amplifier With Controlled Termination Adjustment

Kumar¹,

Limiti²,

Paoloni³

2013

PIER

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Abstract-A new circuit and technique to extend the bandwidth of the Dual Fed Distributed Amplifier (DFDA) while preserving the improvement on efficiency performance in comparison to conventional distributed amplifiers (DAs) is presented. The theoretical analysis is described in detail, and a test vehicle is realized to demonstrate the effectiveness of the proposed method. Output power of ∼ 29 dBm, gain of 10 dB, covering a bandwidth from 100 to 800 MHz, with a PAE of 20-45% is experimentally demonstrated. The results are compared with measured results of the conventional DA, demonstrating a significant improvement in bandwidth and efficiency.

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“…For the wideband performance, the distributed amplifications have been used because of their flat gain, linear phase, and low return losses. However, their low output power and low efficiency are main disadvantages [3][4][5][6]. To overcome severe limitations, the dual-fed distributed PAs, the tapered drain line distributed PAs, and so on have been suggested [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…It is necessary for the N-way balanced PA to combine the input and output powers of the several transistors using the N-way power divider and combiner. However, the distributed amplification is a method where power combining is performed directly at the device level without the need for N-way combiners [3][4][5][6][7][8]. The conventional distributed PA provides ultra-wide bandwidth, but has low efficiency and some of the transistors are idle [4].…”

Section: Introductionmentioning

confidence: 99%

“…The conventional distributed PA provides ultra-wide bandwidth, but has low efficiency and some of the transistors are idle [4]. As shown in Figure 1(b), the dual-fed distributed amplifier incorporates a pair of transmission lines (TLs) that are periodically coupled by the transistors, a hybrid to drive both ends of the gate (input) line, and another hybrid to combine waves appearing at the ends of the drain (output) line [5][6][7]. Previous literature has investigated the gain and efficiency of the dual-fed distributed PA compared with the conventional distributed PA [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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