@inproceedings{24403, abstract = {{A passive microwave sensor based on microstrip lines for characterizing cell cultivation in aqueous compartments is presented. The proposed design methodology leads to a highly sensitive biosensor structure, which is fabricated on Rogers 3003 material. It is shown that a sufficiently high sensitivity is achieved to monitor the cultivation stadium of a yeast culture based on detection of permittivity changes. The obtained measurement results show good agreement with the performed full 3D EM simulations. According to these results the presented biosensor is capable of characterizing the stage of yeast cultivation label-free and contactless.}}, author = {{Wessel, Jan and Schmalz, Klaus and Cahill, Brian and Gastrock, Gunter and Scheytt, Christoph}}, booktitle = {{Microwave Conference (EuMC), 2012 42nd European}}, title = {{{Microwave Biosensor for Characterization of Compartments in Teflon Cappilaries}}}, doi = {{10.23919/EuMC.2012.6459231 }}, year = {{2012}}, } @inproceedings{24404, abstract = {{Precise position is necessary for a robot to reliably localize itself and navigate in the environment. Robot position can be calculated internally or acquired from an external system. This paper presents a software architecture of a vision-based robot tracking system that can provide precise position information as well as identification of many robots. The software architecture has been designed to take into consideration the need for a flexible and scalable system that can interoperate with many similar systems and support different types of image sources, image processing, and outputs. With the architecture, future enhancements or replacements can be implemented as plug-ins, which can be easily integrated into the system. This paper also demonstrates the proposed architecture in different application scenarios}}, author = {{Tanoto, Andry and Li, Hanyi and Rückert, Ulrich and Sitte, Joaquin}}, booktitle = {{In Proceedings of the IEEE International Symposium on Intelligent Control (ISIC)}}, pages = {{pp. 19--24}}, title = {{{Scalable and Flexible Vision-Based Multi-Robot Tracking System}}}, doi = {{10.1109/ISIC.2012.6398261}}, year = {{2012}}, } @inproceedings{24405, abstract = {{Abstract— This paper presents a fully digital transmitter architecture based on a digital polar modulator (DPM) and switch-mode power amplifier (SMPA). A simple method for comparison and estimation of different digital modulation techniques for SMPA is described. An estimation of the proposed digital polar modulator properties was done by means of a 2.1..2.2 GHz class-F power amplifier. For a CDMA signal with 9.5 dB peak-to-average power ratio (PAPR), the class-F based amplifier module driven by DPM pulse train shows more than 1 W output power and more than 10 % of drain efficiency. }}, author = {{Ostrovskyy, Philip and Heuermann, Holger and Sadeghfam, Arash and Scheytt, Christoph}}, booktitle = {{Microwave Integrated Circuits Conference (EuMIC), 2012 7th European}}, location = {{Amsterdam}}, pages = {{659--662}}, title = {{{Performance Estimation of Fully Digital Polar Modulation driving a 2 GHz Switch-Mode Power Amplifier}}}, doi = {{10.23919/EuMC.2012.6459419}}, year = {{2012}}, } @article{24406, abstract = {{A subharmonic receiver for sensing applications in the 245 GHz ISM band has been proposed. The receiver consists of a single-ended common base LNA, a 60 GHz push-push VCO with 1/32 divider, a transconductance 4th subharmonic mixer and IF amplifier. The receiver is fabricated in fT/fmax=300/500 GHz SiGe: C BiCMOS technology. Its measured single-ended gain is 21 dB at 243 GHz with tuning range of 12 GHz, and the single- side band noise figure is 32 dB. The input 1-dB compression point is at -37 dBm. The receiver dissipates a power of 358 mW. Index Terms— SiGe technology, millimeter-wave circuits, 245 GHz, CB LNA, SHM, VCO, sub-harmonic receiver.}}, author = {{Mao, Yanfei and Schmalz, Klaus and Borngräber, Johannes and Scheytt, Christoph}}, journal = {{Microwave Theory and Techniques, IEEE Transactions on}}, number = {{99}}, pages = {{183--186}}, title = {{{245-GHz subharmonic receiver in SiGe }}}, volume = {{PP}}, year = {{2012}}, } @article{24407, abstract = {{A tunable fourth-order bandpass ΔΣ modulator (BDSM) designed and fabricated in 0.25μm SiGe BiCMOS technology is presented. The designed modulator relaxes switching conditions for the amplification stage of the switch-mode power amplifier in comparison to the BDSM architecture. The BDSM is clocked at 5 GHz, while the notch frequency can be tuned in a range of 2.1-2.2 GHz. The modulator achieves 46.6-dB signal-to-noise and distortion ratio in 10-MHz bandwidth for a sine-wave input at 2.2 GHz consuming 330 mW from a 3-V supply. The BDSM was also tested with a single-channel WCDMA signal. It has demonstrated 42.2-dBc adjacent channel leakage ratio at 5-MHz offset and less than 2.1% error vector magnitude over the tuning range.}}, author = {{Ostrovskyy, Philip and Gustat, Hans and Ortmanns, Maurits and Scheytt, Christoph}}, issn = {{1557-9670}}, journal = {{Microwave Theory and Techniques, IEEE Transactions on}}, number = {{8}}, pages = {{2524--2531}}, title = {{{A 5-Gb/s 2.1–2.2-GHz Bandpass \Delta \Sigma Modulator for Switch-Mode Power Amplifier}}}, doi = {{10.1109/TMTT.2012.2203143}}, volume = {{60}}, year = {{2012}}, } @article{24408, abstract = {{This paper presents a 60-GHz SiGe PA with a 29.2% power-added efficiency (PAE), a peak power of 16.8 dBm, and a peak output 1-dB compression (OP 1dB ) of 14 dBm. Its measured gain is 13.5 dB at 60 GHz with a corresponding 3-dB bandwidth of 47-74 GHz. The PAE is above 25% with a supply voltage from 2.2 to 4 V. A cascode stage has been analyzed and used as the amplifier core. The high PAE is achieved by pushing the upper transistor of the cascode stage to weak avalanche area and correct transistor sizing. The linearity is achieved by optimizing the input matching and emitter degeneration. Safe operation conditions of heterojunction bipolar transistors at dc and high frequencies have been investigated at weak avalanche area. A safe operation boundary for high frequencies is given based on our experimental results and analytical derivations. Large-signal stress tests have shown there is no performance degradation and have proved the validity of this safe operation boundary.}}, author = {{Sun, Yaoming and Fischer, Gerhard G. and Scheytt, Christoph}}, issn = {{1557-9670 }}, journal = {{Microwave Theory and Techniques, IEEE Transactions on}}, number = {{8}}, pages = {{ 2581 -- 2589}}, title = {{{A Compact Linear 60-GHz PA With 29.2% PAE Operating at Weak Avalanche}}}, doi = {{10.1109/TMTT.2012.2202684}}, volume = {{60}}, year = {{2012}}, } @article{24409, abstract = {{We propose a new circuit for the realization of transimpedance amplifiers (TIAs), targeted at reducing the input-referred noise of the TIA or alternatively increasing the bandwidth, without increasing the power dissipation. An intensive theoretical analysis of the method is given. A prototype chip is fabricated in 0.25- μm SiGe BiCMOS technology. The TIA has a gain of 71 dBΩ , a bandwidth of 20.5 GHz, and an average input-referred current noise density of 18 pA/√Hz . The circuit operates from a 2.5-V supply, and power dissipation is 57 mW.}}, author = {{Sedighi, Behnam and Scheytt, Christoph}}, journal = {{(Refa) FB/IE Zeitschrift für Unternehmensentwicklung und Industrial Engineering}}, number = {{8}}, pages = {{461--465}}, title = {{{Low-Power SiGe BiCMOS Transimpedance Amplifier for 25-GBaud Optical Links}}}, doi = {{10.1109/TCSII.2012.2204118}}, volume = {{59}}, year = {{2012}}, } @inproceedings{24410, abstract = {{This paper reviews recent results of wireless transmitter and receiver ICs at 122 and 245 GHz in 0.13 µm SiGe BiCMOS technology together with an efficient on-chip antenna. A transmitter IC with 5 dBm output power and directional onchip power measurement for built-in-self-test is presented. A 122 GHz passive HBT diode mixer design is discussed and results are shown. The mixer exhibits superior 1/f noise performance which makes it especially suitable for FMCW/CW radar sensors. Furthermore a highly integrated 245 GHz transmitter with 1 dBm maximum output power was realized. The IC dissipates only 380 mW. A low-loss on-chip antenna for 130 GHz with 60% efficiency was implemented and measured. It uses localized backside etching techniques and allows for simplified and very cost-efficient mm-wave packaging}}, author = {{Scheytt, Christoph and Sun, Yaoming and Schmalz, Klaus and Wang, Ruoyu}}, booktitle = {{IMS 2012 (International Microwave Symposium)}}, location = {{Montreal, QC, Canada}}, title = {{{SiGe BiCMOS Transceivers, Antennas, and Ultra-Low-Cost Packaging for the ISM Bands at 122 and 245 GHz}}}, doi = {{10.1109/MWSYM.2012.6259487}}, year = {{2012}}, } @inproceedings{24411, abstract = {{A 245 GHz transmitter for sensing applications has been realized, which consists of a push-push VCO with 1/64 frequency divider, a transformer- coupled one-stage power amplifier, and a frequency doubler. It is fabricated in 0.13μm SiGe:C BiCMOS technology with f T /f max of 300GHz/500GHz. The peak output power of the transmitter is 2 dBm. The 3-dB bandwidth reaches from 229 GHz to 251 GHz. The output power is 1 dBm at 245 GHz. The transmitter dissipates 0.29 W. Additionally, a test-circuit with an integrated two-stage power amplifier and a frequency doubler is presented, which reaches 1.4 dBm at 245 GHz and dissipates 0.19 W.}}, author = {{Schmalz, Klaus and Borngräber, Johannes and Heinemann, Bernd and Rücker, Holger and Scheytt, Christoph}}, booktitle = {{Radio Frequency Integrated Circuits Symposium (RFIC), 2012 IEEE}}, pages = {{195 --198}}, title = {{{A 245 GHz transmitter in SiGe technology}}}, doi = {{10.1109/RFIC.2012.6242262}}, year = {{2012}}, } @inproceedings{24412, abstract = {{In this publication an integrated dielectric sensor with read-out circuit in SiGe BiCMOS technology at 125GHz is presented. The sensor consist of a 500 µm shorted half-wave coplanar waveguide transmission line in the top metal layer. Read-out of the sensor is performed by measurement of its reflection coefficient with an integrated multiprobe reflectometer and signal source. The MMIC has been fabricated in a 190-GHz f T SiGe:C BiCMOS technology and assembled on a printed circuit board. Functionality of the sensor is demonstrated with a stimulus frequency from 118 to 133GHz with immersion of the sensor into a binary methanol-ethanol mixture.}}, author = {{Laemmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Weigel, Robert and Kissinger, Dietmar}}, booktitle = {{Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International}}, pages = {{1 --3}}, title = {{{An integrated 125GHz Sensor with read-out circuit for permittivity measurement of liquids}}}, doi = {{10.1109/MWSYM.2012.6258392}}, year = {{2012}}, }