Variable impedance tuner for MMIC's

Bischof, W.

doi:10.1109/75.294282

Cited by 19 publications

(10 citation statements)

References 4 publications

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“…The measured |G MAX | values are comparable with previously published integrated impedance tuners. Some notable results were: A VSWR of 6 at 27 GHz [4], a VSWR of 12.3 at 27 GHz [5], a VSWR of 32.3 at 30 GHz [6], and a VSWR of 99 at 20 GHz [7]. However, all of the tuners in [4][5][6][7] were quite narrowband as opposed to the wideband designs presented here.…”

Section: Measured |G Max |mentioning

confidence: 77%

“…Figure 20 also shows that the intermodulation products are higher at 17 GHz than at 8 GHz as predicted in Ref 15. Also, the IIP3 increases as (Df) 4 , and therefore it can be expected to be > þ60 dBm for a Df of 1 MHz. This is so low that it is simply unmeasurable in most experimental setups.…”

Section: Intermodulation Measurementsmentioning

confidence: 98%

“…Typically, these are mechanical devices with either coaxial or waveguide structures, and use motors for automatic control. Tuners are also made using diodes and transistors, but these designs are lossy and result in a limited impedance coverage [4,5]. Also, they add electronic noise which makes accurate noise measurements more challenging.…”

Section: Introductionmentioning

confidence: 99%

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RF MEMS impedance tuners for 6–24 GHz applications

Vähä-Heikkilä

Caekenberghe

Varis

et al. 2007

Int J RF and Microwave Comp Aid Eng

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RF MEMS tuners with wide impedance coverage have been developed for 6-24 GHz noise parameter and load-pull measurement systems. The tuners are based on triple-, double-, and single-stub topologies loaded with switched MEMS capacitors. Several designs are presented, and they use 10-13 switched MEMS capacitors to produce 1024-8192 (2 10 -2 13 ) different impedances. The measured impedance coverage agrees well with simulations and it is the widest ever measured impedance coverage from any planar tuner to-date.

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Section: Measured |G Max |mentioning

confidence: 77%

Section: Intermodulation Measurementsmentioning

confidence: 98%

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RF MEMS impedance tuners for 6–24 GHz applications

Vähä-Heikkilä

Caekenberghe

Varis

et al. 2007

Int J RF and Microwave Comp Aid Eng

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show abstract

“…These are often intended for frequencies below 30 MHz and power levels from 1 W to 1 kW. Other systems either use MEMS switches [3][4][5][6] or are designed for millimeter wave frequencies [7]. ATUs do not alter the physical antenna; instead, they conjugate match the impedance on one side of the unit with the impedance on the other.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a CMOS impedance tuning unit for DVB-H

Sjöblom

Sjöland

2007

Analog Integr Circ Sig Process

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The use of reconfigurable matching has become more and more desirable as mismatches between such interfaces as antenna and receiver increase. The present paper investigates reconfigurable matching by measurements of a CMOS Impedance Tuning Unit (ITU) designed for Digital Video Broadcasting for Handheld devices (DVB-H). The ITU consists of switched capacitors arranged in three capacitor banks, with inductors between them, thus creating a reconfigurable ladder matching network. It is demonstrated that any mismatch up to VSWR = 8 can be transformed to a mismatch better than VSWR = 2, that IIP2 = 7 dBm and IIP3 = 0.5 dBm, and that loss is 2.1 dB.

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“…In the last decade, several authors have proposed the use of transmission lines loaded by switches in series or in parallel to realize tunable impedance transformers [3,4,5]. These first devices demonstrated the impedance transformer principle but they cover a small part of the Smith chart.…”

mentioning

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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Variable impedance tuner for MMIC's

Cited by 19 publications

References 4 publications

RF MEMS impedance tuners for 6–24 GHz applications

RF MEMS impedance tuners for 6–24 GHz applications

Characterization of a CMOS impedance tuning unit for DVB-H

A compact semi-lumped tunable complex-impedance transformer

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