The design and performance of a fully- integrated wideband 638.1 mm delay TTD chip is presented. ... more The design and performance of a fully- integrated wideband 638.1 mm delay TTD chip is presented. This MMIC integrates 9-bits time-delays, where the least significant hit is 1.3 mm and large significant bit is 320 mm. The MMIC is realized using the 0.25pm PHEMT (edO2ah) OMMlC process. One application in mind is broadband active phased array SAWTI with the sensor
A novel frequency tunable X-band MMIC filter design based on a balanced cascaded second order rec... more A novel frequency tunable X-band MMIC filter design based on a balanced cascaded second order recursive active filter topology is presented together with simulation results. The simulated results indicate that this filter design can achieve a performance adequate for future advanced on-chip radar receivers
2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278)
In this paper, we evaluate a new design of a previously presented (second order) tunable active X... more In this paper, we evaluate a new design of a previously presented (second order) tunable active X-band MMIC filter. By using a two-stage low noise amplifier in each filter section a higher filter gain and selectivity as well as a lower filter noise figure can be achieved at the expense of a smaller filter tuning range. The filter is tunable to eight different center frequencies between 7.6-8.6GHz. Typical measured data for all eight tuning states show a maximum gain that varies between 13-26dB, a 4-5dB noise figure and a spurious-free dynamic range of 58-67dB. The presented filter could potentially be utilized as an important building block to realize agile compact on-chip receiver front-ends for future adaptive X-band radar array antennas, for example.
Ultra wideband reconfigurable be a informing, and in particular aspects of using frequency depend... more Ultra wideband reconfigurable be a informing, and in particular aspects of using frequency dependent aperture area, are discussed. A schematic beamformer is proposed, and two key MMIC components, a reconfigurable power splitter/combiner and a 9-bits time delay, are presented
The M-AESA program is a joint IT-SE initiative for the development of a capability driven MRFS co... more The M-AESA program is a joint IT-SE initiative for the development of a capability driven MRFS concept. The goal of the program is to develop and demonstrate the feasibility of a reconfigurable architecture for a new platform driven family of systems, capable to exploit the most relevant operational functions (Radar, EW, Comm.psilas) according to the operational scenarios. The program, which
Modern digital beamforming antenna array systems require broadband performance for multifunction ... more Modern digital beamforming antenna array systems require broadband performance for multifunction use and electronic warfare applications. A mixer is an essential part of the system. Design considerations and limitations for a broadband performing image rejection mixer are treated. Requirements such as constant image rejection and conversion loss over the desired frequency band, linearity and choice of intermediate frequency. An image rejection mixer for X-band operation and intermediate frequency of 1 GHz has been designed and simulated according to the above design considerations.
1997 IEEE MTT-S International Microwave Symposium Digest
This paper presents a novel design technique that allows the noise figure of active recursive mic... more This paper presents a novel design technique that allows the noise figure of active recursive microwave filters to be reduced to a level approaching that of low-noise amplifiers (LNA). The measured noise figure of a MESFET-based 10 GHz first order MMIC filter is 4.3 dB, less than 1 dB higher than that of the LNA included in the filter. The
2000 5th International Symposium on Plasma Process-Induced Damage (IEEE Cat. No.00TH8479), 2000
The impact of plasma damage on the flicker noise properties of Ti/p-Si and Ti/p-Sil-,Ge, (with x ... more The impact of plasma damage on the flicker noise properties of Ti/p-Si and Ti/p-Sil-,Ge, (with x = 0.05) Schottky junctions is investigated in this work. Two abnormal peaks are observed in the l/f noise spectra at around 500 Hz and 10 kHz which are the characteristics of the plasma damage. These peaks are shown to be independent of the applied bias and Ge concentration. From the noise experimental data, the introduced noise during the plasma etching process is attributed to the recombination generation noise.
A comparison of three phased array concepts that can be used to reduce the frequency dependence o... more A comparison of three phased array concepts that can be used to reduce the frequency dependence of the radiation characteristics of very wideband phased arrays is presented. The three concepts consist of a multiband array, a frequency tapered array and an array with varying element sizes and element distances. Parameters such as aperture area, number of elements, gain, effective radiated
Computational results are presented for circular cylindrical antenna arrays consisting of bicone,... more Computational results are presented for circular cylindrical antenna arrays consisting of bicone, semi bicone and bowtie elements. The presented data show that the performance of the three circular antenna arrays is very similar, and that each array covers the frequency range 6-15 GHz. For this array we can therefore use bowtie elements instead of bicone elements. This simplifies the manufacturing
2007 International Bhurban Conference on Applied Sciences & Technology, 2007
Tomas Boman and Börje Carlegrim. • My parents for their love and support. They have always prayed... more Tomas Boman and Börje Carlegrim. • My parents for their love and support. They have always prayed for my success. My brother Nadeem Mohsin for being a great friend. • Finally, I am grateful for the patience, love, and support from my soul mate Nazia Siddique, and remarkable cooperation from my sweet daughter Maheen Fatima. This thesis is dedicated to them.
2010 IEEE International Symposium on Phased Array Systems and Technology, 2010
The Multi-function Phased Array (M-AESA) program is a joint SE-IT initiative for the development ... more The Multi-function Phased Array (M-AESA) program is a joint SE-IT initiative for the development of a capability driven multifunction phased array system concept. This paper will present the progress the M-AESA research and development program has made over the last three years and it follows the paper “New concepts for MRFS evolutionary trends. The M-AESA program: A joint IT-SE capability
The authors study possibilities of implementing flexible and programmable components for the RF f... more The authors study possibilities of implementing flexible and programmable components for the RF front-ends of wideband multi-functional phased arrays using GaAs MMIC and RF MEMS technologies. The use of MEMS reconfigurable matching networks in tunable bandpass LNAs is proposed to achieve wider tuning ranges (e.g. 6.5-9.9GHz is obtained according to simulations) and adequate performance of such LNAs. The potential for
(not more than 200 words) Mobile and flexible nodes are key features of a future Network Centric ... more (not more than 200 words) Mobile and flexible nodes are key features of a future Network Centric Warfare concept. Important factors when operating an efficient and robust network will be access to secure communication channels, reliable sensor information, and a possibility to dynamically change the roles allocated to different nodes within the network. Microwave-based reconfigurable multifunction systems, capable of performing different functions regarding e.g. radar, electronic warfare, communications and navigation/positioning will be cost-effective alternatives to dedicated systems. If factors such as weight, volume, radar cross section, cooling etc. are considered, the advantages are even bigger, especially for small, mobile platforms. In this report, the pros and cons of multifunction systems are discussed from a tactical/operational perspective as well as a technical and functionality perspective. An example of a concept for a multifunction front-end system is also presented. A simulation model for a multifunction system has been developed in a first version. The tool is implemented in Matlab 6, and is capable of handling a test scenario where jamming and communication functions are to be maintained. As a basis for further development, general design principles for such a simulator have been compiled. These cover objectives of simulation, the structure of the model and implementation aspects. The work described in this report has been funded within the Strategic research cores.
1997 IEEE MTT-S International Microwave Symposium Digest
This paper presents a novel design technique that allows the noise figure of active recursive mic... more This paper presents a novel design technique that allows the noise figure of active recursive microwave filters to be reduced to a level approaching that of low-noise amplifiers (LNA). The measured noise figure of a MESFET-based 10 GHz first order MMIC filter is 4.3 dB, less than 1 dB higher than that of the LNA included in the filter. The
2000 5th International Symposium on Plasma Process-Induced Damage (IEEE Cat. No.00TH8479), 2000
The impact of plasma damage on the flicker noise properties of Ti/p-Si and Ti/p-Sil-,Ge, (with x ... more The impact of plasma damage on the flicker noise properties of Ti/p-Si and Ti/p-Sil-,Ge, (with x = 0.05) Schottky junctions is investigated in this work. Two abnormal peaks are observed in the l/f noise spectra at around 500 Hz and 10 kHz which are the characteristics of the plasma damage. These peaks are shown to be independent of the applied bias and Ge concentration. From the noise experimental data, the introduced noise during the plasma etching process is attributed to the recombination generation noise.
In this paper we discuss tuning properties of recursive active filters. Two different types of tu... more In this paper we discuss tuning properties of recursive active filters. Two different types of tuneable microwave monolithic integrated (MMIC) filters working at X-band have been implemented for evaluation. The first filter type uses an analog transmission-type phase shifter as tuning element resulting in a tuneable bandwidth of 9% and an instantaneous filter bandwidth of only 1.2%. The second filter
The design and performance of a fully- integrated wideband 638.1 mm delay TTD chip is presented. ... more The design and performance of a fully- integrated wideband 638.1 mm delay TTD chip is presented. This MMIC integrates 9-bits time-delays, where the least significant hit is 1.3 mm and large significant bit is 320 mm. The MMIC is realized using the 0.25pm PHEMT (edO2ah) OMMlC process. One application in mind is broadband active phased array SAWTI with the sensor
A novel frequency tunable X-band MMIC filter design based on a balanced cascaded second order rec... more A novel frequency tunable X-band MMIC filter design based on a balanced cascaded second order recursive active filter topology is presented together with simulation results. The simulated results indicate that this filter design can achieve a performance adequate for future advanced on-chip radar receivers
2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278)
In this paper, we evaluate a new design of a previously presented (second order) tunable active X... more In this paper, we evaluate a new design of a previously presented (second order) tunable active X-band MMIC filter. By using a two-stage low noise amplifier in each filter section a higher filter gain and selectivity as well as a lower filter noise figure can be achieved at the expense of a smaller filter tuning range. The filter is tunable to eight different center frequencies between 7.6-8.6GHz. Typical measured data for all eight tuning states show a maximum gain that varies between 13-26dB, a 4-5dB noise figure and a spurious-free dynamic range of 58-67dB. The presented filter could potentially be utilized as an important building block to realize agile compact on-chip receiver front-ends for future adaptive X-band radar array antennas, for example.
Ultra wideband reconfigurable be a informing, and in particular aspects of using frequency depend... more Ultra wideband reconfigurable be a informing, and in particular aspects of using frequency dependent aperture area, are discussed. A schematic beamformer is proposed, and two key MMIC components, a reconfigurable power splitter/combiner and a 9-bits time delay, are presented
The M-AESA program is a joint IT-SE initiative for the development of a capability driven MRFS co... more The M-AESA program is a joint IT-SE initiative for the development of a capability driven MRFS concept. The goal of the program is to develop and demonstrate the feasibility of a reconfigurable architecture for a new platform driven family of systems, capable to exploit the most relevant operational functions (Radar, EW, Comm.psilas) according to the operational scenarios. The program, which
Modern digital beamforming antenna array systems require broadband performance for multifunction ... more Modern digital beamforming antenna array systems require broadband performance for multifunction use and electronic warfare applications. A mixer is an essential part of the system. Design considerations and limitations for a broadband performing image rejection mixer are treated. Requirements such as constant image rejection and conversion loss over the desired frequency band, linearity and choice of intermediate frequency. An image rejection mixer for X-band operation and intermediate frequency of 1 GHz has been designed and simulated according to the above design considerations.
1997 IEEE MTT-S International Microwave Symposium Digest
This paper presents a novel design technique that allows the noise figure of active recursive mic... more This paper presents a novel design technique that allows the noise figure of active recursive microwave filters to be reduced to a level approaching that of low-noise amplifiers (LNA). The measured noise figure of a MESFET-based 10 GHz first order MMIC filter is 4.3 dB, less than 1 dB higher than that of the LNA included in the filter. The
2000 5th International Symposium on Plasma Process-Induced Damage (IEEE Cat. No.00TH8479), 2000
The impact of plasma damage on the flicker noise properties of Ti/p-Si and Ti/p-Sil-,Ge, (with x ... more The impact of plasma damage on the flicker noise properties of Ti/p-Si and Ti/p-Sil-,Ge, (with x = 0.05) Schottky junctions is investigated in this work. Two abnormal peaks are observed in the l/f noise spectra at around 500 Hz and 10 kHz which are the characteristics of the plasma damage. These peaks are shown to be independent of the applied bias and Ge concentration. From the noise experimental data, the introduced noise during the plasma etching process is attributed to the recombination generation noise.
A comparison of three phased array concepts that can be used to reduce the frequency dependence o... more A comparison of three phased array concepts that can be used to reduce the frequency dependence of the radiation characteristics of very wideband phased arrays is presented. The three concepts consist of a multiband array, a frequency tapered array and an array with varying element sizes and element distances. Parameters such as aperture area, number of elements, gain, effective radiated
Computational results are presented for circular cylindrical antenna arrays consisting of bicone,... more Computational results are presented for circular cylindrical antenna arrays consisting of bicone, semi bicone and bowtie elements. The presented data show that the performance of the three circular antenna arrays is very similar, and that each array covers the frequency range 6-15 GHz. For this array we can therefore use bowtie elements instead of bicone elements. This simplifies the manufacturing
2007 International Bhurban Conference on Applied Sciences & Technology, 2007
Tomas Boman and Börje Carlegrim. • My parents for their love and support. They have always prayed... more Tomas Boman and Börje Carlegrim. • My parents for their love and support. They have always prayed for my success. My brother Nadeem Mohsin for being a great friend. • Finally, I am grateful for the patience, love, and support from my soul mate Nazia Siddique, and remarkable cooperation from my sweet daughter Maheen Fatima. This thesis is dedicated to them.
2010 IEEE International Symposium on Phased Array Systems and Technology, 2010
The Multi-function Phased Array (M-AESA) program is a joint SE-IT initiative for the development ... more The Multi-function Phased Array (M-AESA) program is a joint SE-IT initiative for the development of a capability driven multifunction phased array system concept. This paper will present the progress the M-AESA research and development program has made over the last three years and it follows the paper “New concepts for MRFS evolutionary trends. The M-AESA program: A joint IT-SE capability
The authors study possibilities of implementing flexible and programmable components for the RF f... more The authors study possibilities of implementing flexible and programmable components for the RF front-ends of wideband multi-functional phased arrays using GaAs MMIC and RF MEMS technologies. The use of MEMS reconfigurable matching networks in tunable bandpass LNAs is proposed to achieve wider tuning ranges (e.g. 6.5-9.9GHz is obtained according to simulations) and adequate performance of such LNAs. The potential for
(not more than 200 words) Mobile and flexible nodes are key features of a future Network Centric ... more (not more than 200 words) Mobile and flexible nodes are key features of a future Network Centric Warfare concept. Important factors when operating an efficient and robust network will be access to secure communication channels, reliable sensor information, and a possibility to dynamically change the roles allocated to different nodes within the network. Microwave-based reconfigurable multifunction systems, capable of performing different functions regarding e.g. radar, electronic warfare, communications and navigation/positioning will be cost-effective alternatives to dedicated systems. If factors such as weight, volume, radar cross section, cooling etc. are considered, the advantages are even bigger, especially for small, mobile platforms. In this report, the pros and cons of multifunction systems are discussed from a tactical/operational perspective as well as a technical and functionality perspective. An example of a concept for a multifunction front-end system is also presented. A simulation model for a multifunction system has been developed in a first version. The tool is implemented in Matlab 6, and is capable of handling a test scenario where jamming and communication functions are to be maintained. As a basis for further development, general design principles for such a simulator have been compiled. These cover objectives of simulation, the structure of the model and implementation aspects. The work described in this report has been funded within the Strategic research cores.
1997 IEEE MTT-S International Microwave Symposium Digest
This paper presents a novel design technique that allows the noise figure of active recursive mic... more This paper presents a novel design technique that allows the noise figure of active recursive microwave filters to be reduced to a level approaching that of low-noise amplifiers (LNA). The measured noise figure of a MESFET-based 10 GHz first order MMIC filter is 4.3 dB, less than 1 dB higher than that of the LNA included in the filter. The
2000 5th International Symposium on Plasma Process-Induced Damage (IEEE Cat. No.00TH8479), 2000
The impact of plasma damage on the flicker noise properties of Ti/p-Si and Ti/p-Sil-,Ge, (with x ... more The impact of plasma damage on the flicker noise properties of Ti/p-Si and Ti/p-Sil-,Ge, (with x = 0.05) Schottky junctions is investigated in this work. Two abnormal peaks are observed in the l/f noise spectra at around 500 Hz and 10 kHz which are the characteristics of the plasma damage. These peaks are shown to be independent of the applied bias and Ge concentration. From the noise experimental data, the introduced noise during the plasma etching process is attributed to the recombination generation noise.
In this paper we discuss tuning properties of recursive active filters. Two different types of tu... more In this paper we discuss tuning properties of recursive active filters. Two different types of tuneable microwave monolithic integrated (MMIC) filters working at X-band have been implemented for evaluation. The first filter type uses an analog transmission-type phase shifter as tuning element resulting in a tuneable bandwidth of 9% and an instantaneous filter bandwidth of only 1.2%. The second filter
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