Compact Analog Phase Shifters using Thin-Film (Ba,Sr)TiO3 Varactors

Chen, L.-Y.V.; Forse, R.; Cardona, A. H.; Watson, T.C.; York, R.A.

doi:10.1109/mwsym.2007.380008

Cited by 21 publications

(12 citation statements)

References 8 publications

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“…In contrast, the bandwidth for the phase shift is quite narrow. To improve the bandwidth for phase shift, one may cascade multiple stages of all-pass phase shifters that are designed at different frequencies [3,4,6,7]. Based on this idea, a multi-stage all-pass phase shifter is simulated using the measured S parameters of the single-stage all-pass phase shifter presented in Section 3.…”

Section: Multi-stage All-pass Phase Shiftermentioning

confidence: 99%

“…capacitively loaded transmission line [1], reflection-type [2], etc. Among them, all-pass network has been used to realize both digital [3,4] and analog phase shifters [5,6]. The advantages of all-pass phase shifter include excellent return loss and flat insertion loss responses over wide bandwidth and large phase shift under low capacitance tuning ratio [3].…”

Section: Introductionmentioning

confidence: 99%

“…Although large phase shift can be obtained, the phase shift is however quite narrowband. Cascading multiple stages of all-pass networks has been proposed to provide a constant (equal-ripple) phase shift over a wide frequency range [3,4,6,7]. Nevertheless, the phase error reported in previous work is still large.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the phase error reported in previous work is still large. For example, phase error of at least ±15ﾟ is observed for both the digital all-pass phase shifter in [3] and analog all-pass phase shifter in [6].…”

Section: Introductionmentioning

confidence: 99%

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Broadband analog phase shifter based on multi-stage all-pass networks

Chen

2013

IEICE Electron. Express

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All-pass phase shifters using ferroelectric varactors are designed, fabricated, and measured. The design equations for the allpass phase shifter are presented. The fabrication process of the ferroelectric varactors is described. Measurement results of singlestage all-pass phase shifters show that phase shift greater than 85ﾟ can be achieved under 10-V bias. At the frequency where maximum phase shift occurs, the insertion loss is less than 2 dB and the return loss is greater than 12 dB. Simulations based on the measured S parameters of the single-stage phase shifters show that, by cascading four stages of individually biased single-stage phase shifters, maximum phase shift of 180ﾟ can be achieved with a phase error as low as ±3ﾟ between 2.1 GHz and 3.25 GHz, corresponding to a 43% bandwidth.

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Section: Multi-stage All-pass Phase Shiftermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Broadband analog phase shifter based on multi-stage all-pass networks

Chen

2013

IEICE Electron. Express

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“…Several voltage controlled tunable circuits have been developed, such as varactors, impedance matching circuits, analog phase shifters, and RF tunable filters [2][3]. They have a large operating frequency range that extends from below 1 OOMHz to over 40G Hz.…”

Section: Introductionmentioning

confidence: 99%

Tunable BaSrTiO<inf>3</inf> applications for the RF front end

Cardona¹

2011

2011 IEEE MTT-S International Microwave Symposium

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This article presents the design and performance of tunable components and circuits for mobile device antennas based on Agile's barium strontium titanate (SST) thin film technology. A novel capacitor array has been designed utilizing a nonlinear SST capacitance model and a capacitor array "stacking" technique. Measurements on mobile devices demonstrate extended bandwidth coverage for LTE, cellular, and pes bands while maintaining TRP and TIS, and in some cases improvement over fixed solutions.

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Broadband complementary metal‐oxide semiconductor phase shifter with 6‐bit resolution based on all‐pass networks

2015

IET Microwaves, Antennas & Propagation

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Multi‐stage all‐pass networks can be used to realise broadband phase shifters with low phase error. In this study, single‐stage and two‐stage all‐pass networks with internal switched capacitors are investigated. Potentials and limitations of using the all‐pass networks with internal switched capacitors for phase shifter design are examined. On the basis of the single‐stage and two‐stage all‐pass networks, a fully‐differential digital phase shifter with 6‐bit resolution is designed. The digital phase shifter is implemented using a 0.18‐μm complementary metal‐oxide semiconductor process. The chip area is 2.80 × 1.75 mm2. Measurement results show that minimum root‐mean‐square phase error of 2° is achieved from 2.19 to 2.82 GHz, which translates into a bandwidth (BW) of 25%. The average insertion loss is 14.6 dB at the design frequency of 2.4 GHz. Over the entire BW, the return loss is greater than 9.2 dB and the amplitude error is within ±1 dB.

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Compact Analog Phase Shifters using Thin-Film (Ba,Sr)TiO3 Varactors

Cited by 21 publications

References 8 publications

Broadband analog phase shifter based on multi-stage all-pass networks

Broadband analog phase shifter based on multi-stage all-pass networks

Tunable BaSrTiO<inf>3</inf> applications for the RF front end

Broadband complementary metal‐oxide semiconductor phase shifter with 6‐bit resolution based on all‐pass networks

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