| 1. |
- Norling, Martin, 1981, et al.
(författare)
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A 2 GHz oscillator using a monolithically integrated AlN TFBAR
- 2008
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Ingår i: IEEE MTT-S International Microwave Symposium Digest. - 0149-645X. - 9781424417803 ; 1:1, s. 843-846
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Konferensbidrag (refereegranskat)abstract
- A 2 GHz oscillator based on a solidly mounted AlN thin-film bulk acoustic resonator (TFBAR) is reported. The oscillator is realised as a silicon-on-silicon multi-chip module (MCM) where all passive elements, including the TFBAR, are monolithically integrated on a high-resistivity silicon (HRS) carrier. SiGe transistors are flip-chip mounted on the MCM carrier. Measurements of the oscillators reveal a best phase-noise of -125 dBc/Hz at 100 kHz offset.
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| 2. |
- Abbasi, Morteza, 1982, et al.
(författare)
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A Broadband 60-to-120 GHz single-chip MMIC multiplier chain
- 2009
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Ingår i: IEEE MTT-S International Microwave Symposium Digest. - 0149-645X. ; , s. 441-444
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Konferensbidrag (refereegranskat)abstract
- This paper presents a single-chip 60 GHz to 120 GHz frequency multiplier chain based on 0.1 ?m GaAs mHEMT. The MMIC can deliver 3 to 5 dBm of output power from 110 GHz to 130 GHz with 2 dBm input power and consumes only 65 mW of DC power. The signal at the fundamental frequency is suppressed more than 20 dB over the band of interest. The impedance matching networks are realized using coupled transmission lines.
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| 3. |
- Deleniv, Anatoli, 1969
(författare)
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Analysis of trcuncated 2D periodic structures
- 2005
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Ingår i: IEEE MTT-S International Microwave Symposium Digest. - 0149-645X. ; , s. 1071-1074
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Tidskriftsartikel (refereegranskat)abstract
- A multiport admittance/impedance matrix for the truncated 2D periodic structure is derived via expansion of node voltages and currents in terms of Floquet`s waves. It is shown that for uniaxial propagation, the structure comprised of a finite number of columns/rows is identical to multicoupled lines with properly defined parameters. The 4x4 unit cell array fed at different sides is analyzed using the developed formulation. The results are then verified with a rigorous Sonnet simulation, thereby confirming the validity of the presented approach
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| 4. |
- Deleniv, Anatoli, 1969, et al.
(författare)
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Experimental characterization of the 3rd order nonlinearities in thin film parallel-plate ferroelectric varactors
- 2007
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Ingår i: IEEE MTT-S International Microwave Symposium Digest. - 0149-645X. - 1424406889 ; 2, s. 683-686
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Konferensbidrag (refereegranskat)abstract
- The 3rd order nonlinearities in parallel-plate ferroelectric varactors based on thin Ba0.25Sr0.75TiO3 epitaxial films are characterized in wide temperature range. Both, the generated 3rd order harmonic and 3rd order intermodulation products are measured experimentally. The 3rd harmonic IP3 at room temperature is measured to be 35dBm and is favorable as compared to semiconductor competitors. The good agreement between harmonic balance simulation and measured data indicate that the measured low frequency C-V is adequate for accurate design of nonlinear components.
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| 5. |
- Deleniv, Anatoli, 1969, et al.
(författare)
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LTCC compatible ferroelectric phase shifters
- 2005
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Ingår i: IEEE MTT-S International Microwave Symposium Digest. - 0149-645X. ; 1, s. 599-602
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Tidskriftsartikel (refereegranskat)abstract
- Two phase shifters with novel topologies are presented. The phase shifters are based on LTCC compatible ferroelectric films with er=200, and tand=0.04 at 10 GHz. A Ku-band phase shifter is designed to provide DC bias independent matching in the wide frequency range. It has microstrip design where ferroelectric film is used as a substrate and requires relatively low DC bias voltages. The phase shifter showed -15dB matching in 50% bandwidth and 15deg/dB figure of merit. In X-band phase shifter the ferroelectric film is deposited on the low permittivity substrate. Using such two layered substrate a loaded line phase shifter based on coplanar-plate varactors is realized. The varactors are included in the circuit ground and are connected with the microstrip using vias. This designed allows reduction of overall loss due to more efficient use of ferroelectric. The figure of merit of this phase shifter is 20deg/dB at 10 GHz
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| 6. |
- Deleniv, Anatoli, 1969, et al.
(författare)
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Resonance technique for accurate on-wafer characterization of ferroelectric varactors
- 2007
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Ingår i: IEEE MTT-S International Microwave Symposium Digest. - 0149-645X. - 1424406889 ; 3, s. 2063-2066
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Konferensbidrag (refereegranskat)abstract
- A resonance technique for on-wafer characterization of ferroelectric varactors at microwave frequencies is proposed and experimentally verified. The approach is targeted on accurate assessment of the varactors losses if traditional approaches using planar transmission lines can not be used. A number of varactors based on 0.55um thick BSTO film are measured using the proposed approach and results are compared to those obtained with the broadband reflection type measurement. It is demonstrated that the resonance technique is more accurate and reliable.
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| 7. |
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| 8. |
- Fager, Christian, 1974, et al.
(författare)
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Improvement of Oscilloscope Based RF Measurements by Statistical Averaging Techniques
- 2006
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Ingår i: IEEE MTT-S International Microwave Symposium Digest. - 0149-645X. ; , s. 1460-1463
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Konferensbidrag (refereegranskat)abstract
- This paper demonstrates a method for accurate characterization of modulated microwave signals using a digital storage oscilloscope (DSO). Repeated measurements of the modulated signal are used with statistical averaging techniques to significantly improve the dynamic range. The performance of the method is evaluated by residual EVM and RF spectrum measurements. AM/AM measurements using two DSO channels are used to demonstrate the ability to perform synchronous input/output PA characterization.
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| 9. |
- Gustavsson, Ulf, 1975, et al.
(författare)
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A general method for passband quantization noise suppression in pulsed transmitter architectures.
- 2009
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Ingår i: Microwave Symposium Digest, 2009. MTT '09. IEEE MTT-S International.. - 0149-645X. ; , s. 1529 - 1532
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Tidskriftsartikel (refereegranskat)abstract
- In this paper we describe a novel method for selective bandpass cancellation of the quantization-noise that occurs in pulsed transmitter architectures, where the signal is partially or completely quantized. A carrier bursting transmitter architecture, where the amplitude part is quantized and then recombined with a phase-modulated RF carrier, is used as a general example to demonstrate the principles of the method proposed. Measurements on a high efficiency 10 W LDMOS PA working at 1 GHz are used to verify the theoretical results.
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| 10. |
- Mashad Nemati, Hossein, 1980, et al.
(författare)
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Characterization of switched mode LDMOS and GaN power amplifiers for optimal use in polar transmitter architectures
- 2008
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Ingår i: IEEE MTT-S International Microwave Symposium Digest. - 0149-645X. - 9781424417810 ; , s. 1505-1508
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Konferensbidrag (refereegranskat)abstract
- In this paper, switched mode power amplifiers with different classes of operation and device technologies are characterized versus input power and output supply voltage. The results are used to identify optimal control schemes for use in polar transmitter architectures. Then the effects of different control schemes on the requirements for the power amplifier, and the envelope amplifier, as the main building blocks of this architecture, are investigated.
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