Browsing by Author "Nowotny, Ulrich"

Now showing 1 - 12 of 12

Open Access
10-20 Gbit/s GaAs/AlGaAs HEMT ICs for high speed data links
(1992) Berroth, Manfred; Hurm, Volker; Lang, Manfred; Ludwig, Manfred; Nowotny, Ulrich; Wang, Zhigong; Wennekers, Peter; Hülsmann, Axel; Kaufel, Gudrun; Köhler, Klaus; Raynor, Brian; Schneider, Joachim
A set of ICs has been developed for high-speed data links at data rates above 10 Gbit/s. A recessed gate process for double pulse doped quantum well transistors has been used with e-beam written 0.3- μm gates. A 4 bit multiplexer and a laser diode driver for the transmitter as well as a transimpedance amplifier, bit synchronizer, and 4 bit demultiplexer for the receiver have been successfully operated with data rates up to 20 Gbit/s.
Open Access
11.6 Gbps 1:4 demultiplexer using double pulse doped quantum well GaAs/AlGaAs transistors
(1991) Lang, Manfred; Nowotny, Ulrich; Berroth, Manfred
An ultrahigh speed 4 bit demultiplexer circuit has been developed and fabricated using a recessed gate process for enhancement and depletion transistors with 0.3 mu m gate length. First results show a data rate of 11.6 Gbit/s and a power consumption of 165 mW at 0.85 V supply voltage, including four 50 Omega buffers.
Open Access
15 Gbit/s integrated laser diode driver using 0.3 μm gate length quantum well transistors
(1992) Wang, Zhigong; Berroth, Manfred; Nowotny, Ulrich; Gotzeina, Werner; Hofmann, Peter; Hülsmann, Axel; Kaufel, Gudrun; Köhler, Klaus; Raynor, Brian; Schneider, Joachim
An integrated laser diode driver was realised using enhancement/depletion 0.3 μm recessed-gate AlGaAs/GaAs quantum well transistors. Fully-open eye diagrams were observed at bit rates up to 10 Gbit/s with 50 Ω loads. The maximum DC and modulation current were 25 and 45 mA, respectively. The power consumption is less than 450 mW.
Open Access
16 x 16 bit parallel multiplier based on 6 K gate array with 0.3 μm AlGaAs/GaAs quantum well transistors
(1992) Thiede, Andreas; Berroth, Manfred; Hurm, Volker; Nowotny, Ulrich; Seibel, Jörg; Gotzeina, W.; Sedler, Martin; Raynor, Brian; Köhler, Klaus; Hofmann, Peter; Hülsmann, Axel; Kaufel, Gudrun; Schneider, Joachim
The design and performance of a 16x16 bit parallel multiplier based on a 6 K gate array will be presented. This LSI semicustom IC demonstrates the high potential of the authors' AlGaAs/GaAs quantum well FETs with a gate length of 0.3 μm. The best multiplication time measured was 7.2 ns.
Open Access
18 Gbit/s monolithically integrated 2:1 multiplexer and laser driving using 0.3 μm gate length quantum well HEMTs
(1992) Wang, Zhigong; Nowotny, Ulrich; Berroth, Manfred; Bronner, Wolfgang; Hofmann, Peter; Hülsmann, Axel; Köhler, Klaus; Raynor, Brian; Schneider, Joachim
A monolithically integrated 2:1 multiplexer and laser diode driver was developed, using AlGaAs quantum well HEMTs of 0.3 μm gate length. The DC and modulation current is 25 and 45 mA, respectively. Open eye diagrams were measured at bit rates up to 18 Gbit/s with pseudorandom data streams.
Open Access
An 18-34-GHz dynamic frequency divider based on 0.2-μm AlGaAs/GaAs/AlGaAs quantum-well transistors
(1993) Thiede, Andreas; Berroth, Manfred; Nowotny, Ulrich; Seibel, Jörg; Bosch, Roland; Köhler, Klaus; Raynor, Brian; Schneider, Joachim
The design and performance of a dynamic frequency divider was presented. This digital IC demonstrates the ability of the authors' AlGaAs/GaAs/AlGaAs quantum-well FETs with gate lengths of 0.2 μm. Stable operation was achieved in the frequency range from 18 GHz up to 34 GHz with a power consumption of 250 mW. To the authors' knowledge, this is the best result ever reported for HEMT circuits, and is similar to the frequency limit achieved by use of AlGaAs/GaAs HBTs.
Open Access
A 2.5 ns 8 x 8-b parallel multiplier using 0.5 μm GaAs/GaAlAs heterostructure field effect transistors
(1991) Berroth, Manfred; Hurm, Volker; Nowotny, Ulrich; Hülsmann, Axel; Kaufel, Gudrun; Köhler, Klaus; Raynor, Brian; Schneider, Joachim
To increase performance of GaAs LSI digital circuits, a 0.5 μm recessed gate process has been developed and utilized for an 8x8-b parallel multiplier. The chip contains about 3000 heterostructure field effect transistors and has a power consumption of 1.5 W. The best results of the maximum multiplication time measured were below 2.5 nsec.
Open Access
20 Gbit/s 2:1 multiplexer using 0.3 μm gate length double pulse doped quantum well GaAs/AlGaAs transistors
(1991) Nowotny, Ulrich; Lang, Manfred; Berroth, Manfred; Hurm, Volker; Hülsmann, Axel; Kaufel, Gudrun; Köhler, Klaus; Raynor, Brian; Schneider, Joachim
A high speed 2:1 multiplexer circuit in source coupled FET logic has been developed and fabricated using a recessed gate process for enhancement and depletion transistors with 0.3μm gate length. First results show a data rate of over 20 Gbit/s at 5 V supply voltage and 250 mW power consumption. The output voltage swing is adjustable between 0.3 V and 0.8 V for a 50 Ohm load. The out-put level can be varied between +1 V an -1 V. Comparison between simulation and measurement shows very good agreement.
Open Access
28-51 GHz dynamic frequency divider based on 0.15 μm T-gate Al0.2Ga0.8As/In0.25Ga0.75As MODFETs
(1993) Thiede, Andreas; Tasker, Paul; Hülsmann, Axel; Köhler, Klaus; Bronner, Wolfgang; Schlechtweg, Michael; Berroth, Manfred; Braunstein, Jürgen; Nowotny, Ulrich
The design and performance of a 28-51 GHz dynamic frequency divider based on pseudomorphic Al0.2Ga0.8As/In0.25Ga0.75As MODFETs with 0.15 μm mushroom-shaped gates are presented. The circuit has a power consumption of approximately 440 mW and a chip area of approximately 200x220 μm2.
Open Access
7.5 Gb/s monolithically integrated clock recovery circuit using PLL and 0.3-μm gate length quantum well HEMT's
(1994) Wang, Zhigong; Berroth, Manfred; Nowotny, Ulrich; Hofmann, Peter; Hülsmann, Axel; Köhler, Klaus; Raynor, Brian; Schneider, Joachim
A monolithically integrated clock recovery (CR) circuit making use of the phase-locked loop (PLL) circuit technique and enhancement/depletion AlGaAs/GaAs quantum well-high electron mobility transistors (QW-HEMT's) with gate lengths of 0.3 μm has been realized. A novel preprocessing circuit was used. In the PLL a fully-balanced varactorless VCO was applied. The VCO has a center oscillating frequency of about 7.7 GHz and a tuning range greater than 500 MHz. A satisfactory clock signal has been obtained at a bit rate of about 7.5 Gb/s. The power consumption is less than 200 mW at a supply voltage of -5 V.
Open Access
7.5 Gb/s monolithically integrated clock recovery using PLL and 0.3 μM gate length quantum well HEMTs
(1993) Wang, Zhigong; Berroth, Manfred; Nowotny, Ulrich; Hofmann, Peter; Hülsmann, Axel; Köhler, Klaus; Raynor, Brian; Schneider, Joachim
A monolithically integrated clock recovery (CR) circuit making use of the phase-locked loop (PLL) circuit technique and enhancement/depletion AlGaAs/GaAs quantum well high electron mobility transistors (QW-HEMTs) with gate lengths of 0.3 μm has been realized. A novel preprocessing circuit was used. In the PLL a fully-balanced varactorless VCO has been introduced. The VCO has a centre oscillating frequency of about 7.5 GHz and a tuning range greater than 500 MHz. A satisfactory clock signal has been obtained at the bit rate of about 7.5 Gb/s. The power consumption is less than 200 mW at the supply voltage of -5 V.
Open Access
Integrated laser-diode voltage driver for 20-Gb/s optical systems using 0.3- μm gate length quantum-well HEMT's
(1993) Wang, Zhigong; Berroth, Manfred; Nowotny, Ulrich; Ludwig, Manfred; Hofmann, Peter; Hülsmann, Axel; Köhler, Klaus; Raynor, Brian; Schneider, Joachim
An integrated laser-diode voltage driver (LDVD) making use of enhancement/depletion AlGaAs-GaAs quantum-well high electron mobility transistors (QW HEMTs) with gate lengths of 0.3 μm has been developed. Its large signal bandwidth is 12 GHz. Eye diagrams of the output signal at bit rates up to 8 Gb/s show an opening similar to that of the input signal. Supporting material is given indicating that the LDVD might operate at bit rates up to 20 Gb/s. The maximum output current is over 90 mA; the maximum modulation voltage of 800 mV corresponds to 40-mA modulation current for a laser diode with 20-Ω dynamic resistance. The power consumption is less than 500 mW.