A monolithic reconfigurable tuner with ohmic contact MEMS switches for efficiency optimization of X-band power amplifiers

Zheng, Guoxing; Kirby, P.L.; Pajic, S.; Pothier, A.; Blondy, Pierre; Papapolymerou, John; Popovic, Z.B.

doi:10.1109/smic.2004.1398192

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…With the MEMS switches and MEMS varactors development, other designs based on single-stub [10], double-stub [11, 12, 13] or triple-stub topologies [14, 15] have also been realized. Most of these devices need lots of MEMS switches or varactors complicating the bias commands.…”

Section: Introductionmentioning

confidence: 99%

A compact semi-lumped tunable complex-impedance transformer

Perrier¹,

Duchamp²,

Exshaw³

et al. 2009

Int. J. Microw. Wireless Technol.

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-This article describes the design and performance of a compact tunable impedance transformer. The structure is based on a transmission line loaded by varactor diodes. Using only two pairs of diodes, the circuit is very small with a total length of only λ/10. Both the frequency range and the load impedance can be tuned by varying the varactor bias voltages. Our design provides a tunable operating frequency range of ± 40% and an impedance match ranging from 20 Ω to 90 Ω at 0.8 GHz and from 30 Ω to 170 Ω at 1.5 GHz. In addition, a new approach that considers losses for the simulation and measurement of this impedance transformer was investigated. The measured performance of a 1 GHz prototype design confirmed the validity of this new approach.

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