| 1. |
- Andrijevic, Goran, et al.
(författare)
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A fully integrated low-IF DVB-T receiver architecture
- 2004
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Ingår i: 2004 INTERNATIONAL SYMPOSIUM ON SYSTEM-ON-CHIP, PROCEEDINGS. - 0780385586 ; , s. 189-192
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Konferensbidrag (refereegranskat)abstract
- We propose a fully integrated DVB-T receiver architecture for low cost CMOS implementation. The receiver uses a dual-IF architecture to cover the receive bands from 170 MHz to 862 MHz and a Low-IF of 4.57 MHz. Key performance values meet the DVB-T requirements with competitive performance (Sensitivity 72.5 dBm, Noise Figure 66 dB, Adjacent Channel Protection Ratio-ACPR=43dB, available SNR=28 dB) and suggest that low cost receivers are realistic in volume for the coming digital broadcasting systems.
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| 2. |
- Andrijevic, Goran, et al.
(författare)
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Multistandard receiver for home networking and digital media
- 2004
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Ingår i: 22ND NORCHIP CONFERENCE, PROCEEDINGS. - NEW YORK : IEEE. - 0780385101 ; , s. 131-134
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Konferensbidrag (refereegranskat)abstract
- We propose a fully integrated multistandard receiver architecture that fulfills coming media and networking needs of homes. The receiver uses a dual-IF architecture to cover receive bands from 170 MHz to 920 MHz and the Industrial, Scientific and Medical (ISM) band at 2.4GHz. Key performance values meet the DVB-T, Zigbee, Bluetooth and 802.11b requirements (Sensitivity -72.5dBm. available SNR=28dB. Noise Figure 6.7dB. Adjacent Channel Protection Ratio-ACPR=-44dB, IIP3 = -11 dBm).
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| 3. |
- Magnusson, Håkan, et al.
(författare)
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A compact dual-band power amplifier driver for 2.4GHz and 5.2GHz WLAN transmitters
- 2007
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Ingår i: Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium. - 9781424405305 ; , s. 83-86
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Konferensbidrag (refereegranskat)abstract
- This paper presents a dual-band power amplifier (PA) driver with matched output operating in the 2.4 GHz and 5.2 GHz ISM bands. The use of tunable differential inductors both in the RF choke and the matching circuit saves significant die-area compared to traditional configurations of integrated PA drivers. The fabricated circuit size is as small as 0.48 mm 2 for the used 0.18 mu m CMOS process, saving about 0.5 mm(2) silicon area. Measurement results show that the circuit achieves 10.4 dB gain and a maximum output power of 13 dBm at 2.4 GHz while the gain is 5.1 dB and maximum output power is 8.7dBm at 5.2 GHz. The circuit dissipates 13mA from a 1.8V supple.
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| 4. |
- Magnusson, Håkan, et al.
(författare)
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A cross-coupled dual-loop feedback power amplifier driver
- 2005
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Ingår i: Proceedings of the 2005 European Conference on Circuit Theory and Design. - 0780390660 - 9780780390669 ; , s. 309-312
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Konferensbidrag (refereegranskat)abstract
- This paper presents a wide-band power amplifier (PA) driver with matched output. A dual-loop cross-coupled feedback is applied on a simple two stage core amplifier. The use of a dual-loop feedback provides a broad-band 50 Ω output match without the use of any area consuming matching networks. The PA driver exhibits a gain higher than 6.4 dB, more than +1.9dBm 1-dB compression point with S22 less than -22 dB at the output, while dissipating 42 mA from a 1.8V supply. The output IP3 is better than +13.9 dBm at 2.4 GHz.
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| 5. |
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| 6. |
- Magnusson, Håkan, et al.
(författare)
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Multiband multi-standard transmitter using a compact power amplifier driver
- 2005
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Ingår i: 2005 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Digest of Papers. - NEW YORK, NY : IEEE. - 0780389832 ; , s. 491-494
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Konferensbidrag (refereegranskat)abstract
- This paper presents a multistandard transmitter solution using a new power amplifier (PA) driver [1] operating in the broadcast, mobile, and the 2&5 GHz ISM bands. The use of dual-loop feedback in the driver provides a matched output without area consuming matching networks. The circuit size is as small as 0.3 mm(2) for the used 0.18 mu m CMOS process, saving about 0.7 mm(2) silicon area. Measurement results show a gain higher than 7.8 dB with a maximum output power of +4 dBm for all bands and using a supply voltage of 1.8V.
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| 7. |
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A wide-band RF front-end for multiband multistandard high-linearity low-IF wireless receivers
- 2002
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Ingår i: IEEE Journal of Solid-State Circuits. - 0018-9200 .- 1558-173X. ; 37:9, s. 1162-1168
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Tidskriftsartikel (refereegranskat)abstract
- A wide-band radio-frequency (RF) front-end is designed with a balanced combined low-noise amplifier and a switching mixer (a low-noise converter) in RF Si-bipolar process with an f(T) of 25 GHz. The circuit achieves 20-dB conversion gain, higher than -4.5-dBm RF-to-IF IIP3 (+15.5-dBm OIP3) and less than 3.8-dB double-side-band noise figure in 900-MHz (e.g., GSM) and 1.9-GHz (e.g., WCDMA) frequency bands. The -1-dB compression point is -20 dBm at 13-mA dc current consumption from a single 5-V supply. The local-oscillator leakage to the input is less than -56 dBm in the 900-MHz band and less than -63 dBm in the 1.9-GHz band. The -3-dB bandwidth of the amplifier is larger than 3 GHz and a wide-band matching at the input with - 10 to -41-dB S-11 is achieved in the frequency bands of interest by applying a dual-loop wide-band active feedback. The die area is 0.69 x 0.9 mm(2). The circuit is suitable for area-efficient multiband multistandard low-IF receivers.
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| 8. |
- Abdalmoaty, Mohamed, 1986-
(författare)
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Learning Stochastic Nonlinear Dynamical Systems Using Non-stationary Linear Predictors
- 2017
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The estimation problem of stochastic nonlinear parametric models is recognized to be very challenging due to the intractability of the likelihood function. Recently, several methods have been developed to approximate the maximum likelihood estimator and the optimal mean-square error predictor using Monte Carlo methods. Albeit asymptotically optimal, these methods come with several computational challenges and fundamental limitations.The contributions of this thesis can be divided into two main parts. In the first part, approximate solutions to the maximum likelihood problem are explored. Both analytical and numerical approaches, based on the expectation-maximization algorithm and the quasi-Newton algorithm, are considered. While analytic approximations are difficult to analyze, asymptotic guarantees can be established for methods based on Monte Carlo approximations. Yet, Monte Carlo methods come with their own computational difficulties; sampling in high-dimensional spaces requires an efficient proposal distribution to reduce the number of required samples to a reasonable value.In the second part, relatively simple prediction error method estimators are proposed. They are based on non-stationary one-step ahead predictors which are linear in the observed outputs, but are nonlinear in the (assumed known) input. These predictors rely only on the first two moments of the model and the computation of the likelihood function is not required. Consequently, the resulting estimators are defined via analytically tractable objective functions in several relevant cases. It is shown that, under mild assumptions, the estimators are consistent and asymptotically normal. In cases where the first two moments are analytically intractable due to the complexity of the model, it is possible to resort to vanilla Monte Carlo approximations. Several numerical examples demonstrate a good performance of the suggested estimators in several cases that are usually considered challenging.
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| 9. |
- Alejano, L. R., et al.
(författare)
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Rock engineering design and the evolution of Eurocode 7
- 2013
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Ingår i: ISRM International Symposium - EUROCK 2013. - : International Society for Rock Mechanics. - 9781138000803 ; , s. 777-782
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Konferensbidrag (refereegranskat)abstract
- The Eurocode for Geotechnical Design, EN-1997-1:2004, informally known as Eurocode 7 or EC7, was fully implemented within the European Union in 2010. This Eurocode is intended to apply to all geotechnical engineering design, including rock engineering. In recognition that all codes must continue to evolve in order to remain applicable, and the long time that such evolution takes, work is already underway under the auspices of the European Committee for Standardisation, CEN, to identify how the code should develop for future revisions. This paper presents a summary of the maintenance procedures for Eurocodes in general and the specific maintenance work currently being undertaken on EC7 in respect of rock engineering design. It also highlights potential future development of EC7, and the need for enthusiastic involvement by the European rock engineering community to direct these developments.
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| 10. |
- Bagger, Reza, 1962-, et al.
(författare)
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RF Power Amplifier IC with Low Memory Effect, Reduced Low Frequency Gain Peak and Isolated Temperature Tracking Circuitry
- 2008
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Ingår i: 2008 IEEE CSIC Symposium. - : IEEE. - 9781424419395 ; , s. 60-63
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Konferensbidrag (refereegranskat)abstract
- A highly linear wideband power amplifier IC with low memory effect for W-CDMA applications is presented utilizing Si LDMOS process technology. The IC was optimized to reduce typical low frequency gain peak often observed in LDMOS power devices. Topology of the interstage matching contributes to reduction of the electrical memory effect to specification level of maximum 2 dB imbalance over power between upper and lower Adjacent Channel Power Ratio when using II-tone wideband modulated signal. The on-chip temperature compensation circuitry tracks the active device temperature characteristic without degradation of the linearity or worsens the memory effect. The measured gain of the IC was 28.5 dB and 3-dB bandwidth of 600 MHz around 2100 MHz was achieved. The IC attained -50 dBc ACPR at 5 W output power. At power level of 45 W and IMD3 = -30dBc (two-tone) the IC exhibited power densities in excess of 469 mW/mm, in which matching losses were included. The IC demonstrated state-of-the-art RF power performance in terms of good linearity, low memory effects, well-suppressed low frequency gain peak and temperature tracking without linearity and IMD balance degradation.
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