Sivers IMA AB

Kista, Sweden

Sivers IMA AB

Kista, Sweden
SEARCH FILTERS
Time filter
Source Type

Chen J.,Ericsson AB | Chen J.,Chalmers University of Technology | He Z.,Chalmers University of Technology | Bao L.,Ericsson AB | And 6 more authors.
European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 7th European Microwave Integrated Circuits Conference, EuMIC 2012 | Year: 2012

A millimeter-wave radio test-bed is implemented which demonstrates 16QAM transmission over 70/80 GHz band for data rate up to 10 Gbps. Performance of the 16QAM transmitter and receiver is evaluated in a loop-back lab set-up. With the proposed 10 Gbps on single carrier system architecture, it is possible to achieve 40 Gbps over a 5 GHz bandwidth when combined with polarization and spatial multiplexing. © 2012 European Microwave Assoc.


Yan Y.,Chalmers University of Technology | Karandikar Y.B.,Chalmers University of Technology | Gunnarsson S.E.,Chalmers University of Technology | Gunnarsson S.E.,Sivers IMA AB | And 8 more authors.
IEEE Transactions on Microwave Theory and Techniques | Year: 2011

This paper presents the design and characterization of two resistive mixers integrated with a double-slot antenna in a 100-nm GaAs mHEMT technology. With RF frequency varying from 185 to 202 GHz, a typical conversion loss (L c) of 8.0 dB is measured for the single-ended mixer and a typical L c of 12.2 dB is obtained from one of the two IF outputs for the single-balanced mixer. Each mixer is integrated with a double-slot antenna and mounted on an Si lens. Incorporating the antenna gain and the conversion loss of the mixer, a typical receiver gain of 15.4 dB is achieved for the integrated antenna with single-ended mixer, and a typical receiver gain of 11.2 dB is obtained for the integrated antenna with single-balanced mixer by measuring one of the two IF outputs. In this paper, a novel method is also proposed and proved to evaluate a moderate to high noise figure (NF) device in millimeter/sub millimeter frequency band. The result shows that the single-ended mixer in this paper has an NF around 1.0 dB higher compared to its Lc, and the single-balanced one has an NF about 1.6 dB higher than its Lc at room-temperature operation. © 1963-2012 IEEE.


Ojefors E.,Sivers IMA AB | Stoij C.,Sivers IMA AB | Heinemann B.,Im Technologiepark 25 | Rucker H.,Im Technologiepark 25
European Microwave Week 2014: "Connecting the Future", EuMW 2014 - Conference Proceedings; EuMIC 2014: 9th European Microwave Integrated Circuits Conference | Year: 2014

An E-band power amplifier is demonstrated in an evaluation version of a fT/fmax 300-GHz/450-GHz SiGe:C BiCMOS technology. Eight-way power combining of the outputs of transformer-matched differential-cascode unit cells is used in the final stage of the amplifier. A breakout of the final stage yields a measured small-signal gain of 14 dB at 80 GHz with a 16-GHz bandwidth, whereas a version of the amplifier with an integrated 4-way power-combined pre-driver provides 28 dB gain. In the 71-76-GHz sub-band, a saturated output power of 22 dBm with an output 1-dB compression point of 20 dBm is measured, while 19 dBm output power and a 17-dBm compression point is obtained in the 81-86-GHz band. The current consumption at a 3.3-V supply voltage is 330 mA for the output stage and 500 mA for the amplifier with an integrated pre-driver. © 2014 European Microwave Association-EUMA.


Hallbjorner P.,SP Technical Research Institute of Sweden | He Z.,Chalmers University of Technology | He Z.,Sinowave AB | Bruce S.,Sivers IMA AB | Cheng S.,Ericsson AB
IEEE Antennas and Wireless Propagation Letters | Year: 2012

A 77-GHz lens antenna for automotive radar applications is presented. It consists of a feeder in the form of a 2 × 2 patch array etched from a single layer on a 100-μm-thick substrate and a commercially available dielectric lens. Compared to previously published lens antennas, the presented design has the advantages of excellent electrical performance and a low profile in combination with a thin lens. Measurements of port impedance match and radiation patterns are presented. Beam tilt by lateral offset of the lens is demonstrated experimentally. © 2006 IEEE.


Ojefors E.,Sivers IMA AB | Heinemann B.,Ihp Microelectronics | Pfeiffer U.R.,University of Wuppertal
IEEE Transactions on Microwave Theory and Techniques | Year: 2012

Monolithically integrated 220- and 320-GHz receiver front-ends manufactured in an engineering version of an f T/f max=280/435-GHz SiGe technology are presented. Subharmonic mixing is provided by a Gilbert cell with stacked switching quads fed by quadrature 110/160-GHz local oscillator (LO) signals. The 220-GHz version of the front-end is equipped with an integrated LNA with a measured 15-dB gain and 28-GHz bandwidth. This front-end yields a conversion gain of 16 dB, an 18-dB single-sideband (SSB) noise figure (NF), and a 30-GHz bandwidth when pumped with a 0-dBm 110-GHz LO signal. The 320-GHz version of the front-end omits the low-noise amplifier and features an integrated × 9 LO multiplier chain to facilitate operation and characterization. A conversion gain of -14 dB and a 36-dB SSB NF is obtained over the 313-to-328-GHz frequency range. The presented circuits demonstrate that a fully integrated receiver front-end can be implemented up to submillimeter-wave frequencies in an SiGe HBT technology. © 2012 IEEE.


Bejarano Carmona M.,Siversima A.B. | Bejarano Carmona M.,Lund University | Tired T.,Lund University
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2016

This work presents a broadband SiGe Power Amplifier (PA) for operation between 60-90 GHz covering both 71-76 GHz and 81-86 GHz E-Band sub-bands. It consists of a two-stage differential cascode amplifier using an LC-interstage matching network in the interface between the stages. Single-ended to differential conversion is accomplished by the use of two stacked 1-To-1 transformers, achieving a simulated insertion loss of 0.63 dB and 0.45 dB at input and output, respectively. The design has been implemented using Infineon B7HF200 0.18 pm SiGe HBT process with fp/fmax 200/250 GHz. Measured performance indicates that the PA delivers 12.6 dBm saturated output power (Psat) with 4.6% peak Power Added Efficiency (PAE) at 84 GHz while providing at least 6 dB of gain covering a frequency range from 62 to 90 GHz. The circuit consumes 102 mA from a 2.8 V power supply and occupies an area of 0.105 mm2. © 2015 IEEE.


Stoij C.,Sivers IMA AB
Microwave Journal | Year: 2012

Information is provided about those antennas that have an appreciable size as compared to wavelength and where matching and radiation efficiency is a minor issue. Most of the energy supplied to the antenna from the transmitter is transformed to radiated energy in one direction or another. The isotropic radiator sends all its energy equally distributed in all directions, but any other physical reliable antenna will concentrate its energy in specific directions. Other radiation patterns can also be desirable, such as broadcast antennas radiating their energy in a doughnut shaped pattern with the antenna in the center. Another example is a radar antenna that has a narrow horizontal beam and a broad beam in azimuth. Antenna area and reciprocity. The effective area of an antenna is defined as the power delivered on the antenna's terminals divided by the power density that the receiving antenna is exposed to.


Patent
Sivers Ima Ab | Date: 2011-07-07

This invention relates to a method for determining at least one of a distance and a relative velocity by means of continuous wave radar measurements. The method includes generating a measurement signal in the form of a continuous wave radar signal; transmitting the measurement signal by means of an antenna (112); reflecting the measurement signal by means of a reflector (118), thereby providing a desired reflected measurement signal; receiving the desired reflected measurement 112 signal; and determining at least one of a distance and a relative velocity between the antenna and the reflector by means of the desired reflected measurement signal. The reflection of the measurement signal involves asymmetrically modulating the measurement signal at the reflector. The determination of at least one of a distance and a relative velocity includes detecting the desired reflected measurement signal among several received reflections of the measurement signal, by means of information added by the asymmetric modulation.


Patent
Sivers Ima AB | Date: 2012-09-19

This invention relates to a transition between a microstrip and a waveguide, comprising a rectangular waveguide (102) having a floor (104), side walls (106), a ceiling (108), and a transition end; a microstrip (110); and a substrate integrated waveguide (112). At the transition end thereof, the rectangular waveguide is coupled to the substrate integrated waveguide at a first end of the substrate integrated waveguide. The microstrip is coupled to the substrate integrated waveguide at a second end thereof. The rectangular waveguide comprises a ridge (118) attached to the ceiling, extending along a portion of the rectangular waveguide, and having a first end portion which is engaged with a portion of a top surface of the substrate integrated waveguide at its first end.


Patent
Sivers Ima AB | Date: 2012-01-18

This invention relates to a method for determining at least one of a distance and a relative velocity by means of continuous wave radar measurements. The method includes generating a measurement signal in the form of a continuous wave radar signal; transmitting the measurement signal by means of an antenna (112); reflecting the measurement signal by means of a reflector (118), thereby providing a desired reflected measurement signal; receiving the desired reflected measurement signal; and determining at least one of a distance and a relative velocity between the antenna and the reflector by means of the desired reflected measurement signal. The reflection of the measurement signal involves asymmetrically modulating the measurement signal at the reflector. The determination of at least one of a distance and a relative velocity includes detecting the desired reflected measurement signal among several received reflections of the measurement signal, by means of information added by the asymmetric modulation.

Loading Sivers IMA AB collaborators
Loading Sivers IMA AB collaborators