Analog tunable matching network using integrated thin-film BST capacitors

Chen, L.-Y. Vicki; Forse, R.; Chase, D.; York, R.A.

doi:10.1109/mwsym.2004.1335862

Cited by 58 publications

(6 citation statements)

References 8 publications

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“…Barium strontium titanate (Ba 1-x Sr x TiO 3 , BST) is an intensively studied and well-known solid solution for various electronic applications such as capacitors [1,2], positive temperature coefficient resistors [3], phase shifters [4], and gas sensors [5]. BST compounds are synthesized through a variety of methods like coprecipitation [6,7], sol-gel synthesis [8], hydrothermal [9], and solid-state [10] reactions.…”

Section: Introductionmentioning

confidence: 99%

Colossal permittivity and low losses in Ba1–Sr TiO3– reduced nanoceramics

Dupuis

Sulekar

Kim

et al. 2016

Journal of the European Ceramic Society

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The oxalate route offers a controlled approach to synthesize pure Ba 1-x Sr x TiO 3 (BST) (0 ≤ x ≤ 1) nanoparticles (≈ 150 nm in diameter). Reduced BST dense nanoceramics were obtained by spark plasma sintering (SPS) and then annealed for a short time to reach colossal permittivity (′ r = 10 5) with low dielectric losses (tan ı = 0.03) at 1 kHz and 300 K. The effects of Ba-Sr substitution on structural, microstructural and electrical properties were analyzed. Comprehensive analysis of the electrical properties indicates that polaron hopping, mediated by Ti 3+ ions and oxygen vacancies is the main contributing mechanism to colossal permittivity in Ba-rich BST compounds. Substitution of Ba by Sr reduced the contribution of polaron hopping and led to a decrease of real and imaginary parts of permittivity, while preserving interfacial polarization and yielding better temperature stability. The lowest temperature coefficient of capacitance, or TCC (variation of capacitance between 310 K and 450 K) value, i.e., 44 ppm K −1 , is obtained for SrTiO 3 .

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Section: Introductionmentioning

confidence: 99%

Colossal permittivity and low losses in Ba1–Sr TiO3– reduced nanoceramics

Dupuis

Sulekar

Kim

et al. 2016

Journal of the European Ceramic Society

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“…For instance, barium strontium titanate based electric field tunable devices have been successfully used as key elements of phase shifters, delay lines, filters, and matching networks. [1][2][3][4][5] In optimized Ba 0.45 Sr 0.55 TiO 3 (BST) devices, the high dielectric constant tunability, g ¼ [(e max À e min )/e max ] Â 100%, and moderately small rf dielectric loss can be concurrently realized, which is crucial for the microwave applications.…”

Section: Introductionmentioning

confidence: 99%

Stoichiometry and phase purity control of radio frequency magnetron sputter deposited Ba0.45Sr0.55TiO3 thin films for tunable devices

Alema

Reinholz

Pokhodnya

2013

Journal of Applied Physics

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Articles you may be interested inEffect of concurrent Mg/Nb-doping on dielectric properties of Ba0.45Sr0.55TiO3 thin films Dielectric properties and microstructure of nano-MgO dispersed Ba 0.3 Sr 0.7 Ti O 3 thin films prepared by sputter deposition Effect of oxygen to argon ratio on properties of (Ba,Sr)TiO 3 thin films prepared by radio-frequency magnetron sputteringThe systematic study of the oxygen partial pressure (OPP) and total chamber gas pressure (TGP) effects on the stoichiometry and crystal structure of rf sputtered Ba 0.45 Sr 0.55 TiO 3 (BST) films and their phase purity allowed identifying close to optimal sputtering parameters for BST single phase polycrystalline film. The film with a Ba/Sr ratio equal to that of the source target and (Ba þ Sr)/Ti ratio close to unity demonstrated the enhanced permittivity value of 553 and tunability of 69%. It was confirmed that the increase of TGP enables better match of the film and target stoichiometry. However, using O 2 /Ar ratio as a parameter should be utilized cautiously since exceeding a threshold OPP (2 mTorr in our case) may facilitate secondary phase formation. Relatively large dielectric losses were observed in both films sputtered at high (30 mTorr) and low (5 mTor) TGPs. The presence of oxygen vacancies was identified as a probable cause of losses, which is indirectly confirmed by the deviation of the film lattice constant from that of the bulk target. V C 2013 AIP Publishing LLC. [http://dx.

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“…To the authors' knowledge, the impact of using tunable matching networks on amplifier efficiency and linearity has not been investigated previously. Although there are many tunable matching network designs, [2,15,25,28,32,33,35,38,39] examples of complete tunable amplifier modules are not many [6,8,11,18,37]. Most of the tunable amplifiers presented in the literature are designed for frequencies between 10-40 GHz and provide up to 10% tunability.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Frequency-Tunable Amplifiers using Varactor Diode Topologies

Nesimoğlu

2011

Circuits Syst Signal Process

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The design of frequency-tunable amplifiers is investigated and the tradeoff between linearity, efficiency and tunability is revealed. Several tunable amplifiers using various varactor diode topologies as tunable devices are designed by using loadpull techniques and their performances are compared. The amplifier using anti-series distortion-free varactor stack topology achieves 38% power added efficiency and it may be tuned from 1.74 to 2.36 GHz (about 35% tunable range). The amplifier using anti-series/anti-parallel topology is tunable from 1.74 to 2.14 GHz (about 23% tunable range) and provides 42% power added efficiency. It is demonstrated that tunable amplifiers using distortion-free varactor stack topologies provide better power added efficiency than the tunable amplifiers using reverse biased varactor diodes and their linearity is similar to that of a conventional amplifier. These amplifiers may facilitate the realization of frequency agile radio frequency transceiver front-ends and may replace several parallel connected amplifiers used in conventional multimode radios.

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Analog tunable matching network using integrated thin-film BST capacitors

Cited by 58 publications

References 8 publications

Colossal permittivity and low losses in Ba1–Sr TiO3– reduced nanoceramics

Colossal permittivity and low losses in Ba1–Sr TiO3– reduced nanoceramics

Stoichiometry and phase purity control of radio frequency magnetron sputter deposited Ba0.45Sr0.55TiO3 thin films for tunable devices

Design and Analysis of Frequency-Tunable Amplifiers using Varactor Diode Topologies

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