Romanian Journal of Information Science and Technology (ROMJIST)

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ROMJIST is a publication of Romanian Academy,
Section for Information Science and Technology

Editor – in – Chief:
Academician Dan Dascalu

Secretariate (office):
Adriana Neagu
Adress for correspondence: romjist@romjist.ro

Editing of the printed version: Mihaela Marian (Publishing House of the Romanian Academy, Bucharest)

Sponsor: National Institute
for R & D in Microtechnology
(IMT Bucharest)

ROMJIST Volume 20, No. 4, 2017, pp. 331-341, Paper no. 569/2017
 

Stefan Simion, Giancarlo Bartolucci
Distributed Amplifier Based Broadband and Low Spurious Frequency Doubler

ABSTRACT: A circuit topology for a frequency doubler consisting of a distributed amplifier working under nonlinear regime is analyzed analytically and characterized experimentally. Fully-distributed circuit topologies for the phase shifter used to realize the gate and drain artificial transmission lines of the distributed amplifier are proposed. For these types of phase shifters, it is shown that efficient rejection of the output odd harmonics is possible, but also low ripple of the output power level on the output second harmonic is obtained. The proposed frequency doubler has been designed for central input frequency equal to 5 GHz, and the designed circuit has been fabricated, too. The experimental conversion loss for the fabricated frequency doubler is less than 4 dB and 7 dB, when the power level to the input is imposed to -1 dBm and 5 dBm, respectively, while the input frequency is between 4 and 6 GHz.

KEYWORDS: Frequency doubler, distributed topology, artificial transmission lines

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