@inproceedings{LenkSchottHilsenbecketal.,
author = {Lenk, Friedrich and Schott, Matthias and Hilsenbeck, Jochen and Heinrich, Wolfgang},
title = {Low phase-noise GaAs-HBT monolithic W-band oscillator},
series = {34th European Microwave Conference, Tuesday 12th, Wednesday 13th and Thursday 14th October},
booktitle = {34th European Microwave Conference, Tuesday 12th, Wednesday 13th and Thursday 14th October},
publisher = {London},
address = {Horizon House Publ.},
isbn = {1-58053-992-0},
pages = {897 -- 900},
language = {en}
}
@inproceedings{SchottLenkHeymann,
author = {Schott, Matthias and Lenk, Friedrich and Heymann, Peter},
title = {On the load-pull effect in MMIC oscillator measurements},
series = {33rd European Microwave Conference, 7 - 9th October 2003, ICM, Munich, Germany, Vol. 1},
booktitle = {33rd European Microwave Conference, 7 - 9th October 2003, ICM, Munich, Germany, Vol. 1},
publisher = {London},
address = {Korizon House Publ.},
isbn = {1-58053-834-7},
doi = {10.1109/EUMC.2003.1262295},
pages = {367 -- 370},
abstract = {Low phase-noise MMIC oscillators are key components for microwave and nun-wave systems. As a consequence, phase-noise measurements of these circuits have become a subject of growing interest and importance. This paper demonstrates that MMIC oscillator circuits with their relatively low Q factors are prone to specific measurement errors. Caused by a load-pull effect, the measurement system can become part of the oscillator, which yields phase-noise data significantly below reality. Special care has to be taken in order to avoid such phenomena.},
language = {en}
}
@inproceedings{LenkSchottHeinrich,
author = {Lenk, Friedrich and Schott, Matthias and Heinrich, Wolfgang},
title = {Modeling and Measurement of Phase Noise in GaAs HBT Ka-Band Oscillators},
series = {31st European Microwave Conference, 2001, 24 - 26 Sept. 2001},
booktitle = {31st European Microwave Conference, 2001, 24 - 26 Sept. 2001},
publisher = {Microwave Engineering Europe},
address = {London},
doi = {10.1109/EUMA.2001.339168},
pages = {1 -- 4},
abstract = {Accurate oscillator phase-noise simulation is a key problem in MMIC design, which is not solved satisfactory so far and needs further investigation. In this paper, a Ka-band MMIC oscillator with GaInP/GaAs HBT and on-chip resonator is treated as an example. Measured phase noise reaches -90 dBc/Hz and below at 100 kHz offset. To evaluate phase-noise prediction, the circuit is simulated using different commercial simulation tools and HBT models. Considerable differences in simulation results are observed.},
language = {en}
}
@inproceedings{SchottKuhnertLenketal.,
author = {Schott, Matthias and Kuhnert, Holger and Lenk, Friedrich and Hilsenbeck, Jochen and W{\"u}rfl, Joachim and Heinrich, Wolfgang},
title = {38 GHz push-push GaAs-HBT MMIC oscillator},
series = {2002 IEEE MTT-S International Microwave Symposium digest, June 2 - 7, 2002, Washington State Convention \& Trade Center, Seattle, Washington, vol. 2},
booktitle = {2002 IEEE MTT-S International Microwave Symposium digest, June 2 - 7, 2002, Washington State Convention \& Trade Center, Seattle, Washington, vol. 2},
publisher = {IEEE Service Center},
address = {Piscataway, NJ},
isbn = {0-7803-7239-5},
doi = {10.1109/MWSYM.2002.1011761},
pages = {839 -- 842},
abstract = {Two differential coplanar MMIC HBT oscillators are presented, a fixed frequency and a VCO version. They provide single-ended output at the second harmonic at 38 GHz as well as differential output at 19 GHz. The oscillators show excellent phase noise performance, the fixed-frequency type reaches -95 dBc/Hz at the fundamental frequency and -89 dBc/Hz at the second harmonic, at 100 kHz offset.},
language = {en}
}
@inproceedings{LenkSchottHilsenbecketal.,
author = {Lenk, Friedrich and Schott, Matthias and Hilsenbeck, Jochen and W{\"u}rfl, Joachim and Heinrich, Wolfgang},
title = {Low phase-noise monolithic GaInP/GaAs-HBT VCO for 77 GHz},
series = {2003 IEEE MTT-S International Microwave Symposium digest, June 8 - 13, 2003, Pennsylvania Convention Center, Philadelphia, Pennsylvania, vol. 2},
booktitle = {2003 IEEE MTT-S International Microwave Symposium digest, June 8 - 13, 2003, Pennsylvania Convention Center, Philadelphia, Pennsylvania, vol. 2},
publisher = {IEEE Service Center},
address = {Piscataway, NJ},
isbn = {0-7803-7695-1},
doi = {10.1109/MWSYM.2003.1212515},
pages = {903 -- 906},
abstract = {Coplanar W-band push-push VCO MMICs using GaInP/GaAs HBTs are presented. One circuit operates at 77 GHz with phase noise of -92 dBc/Hz at 1 MHz offset. To our knowledge this is the first fully monolithic W-band VCO with phase noise better than -90 dBc/Hz. A second version with two varactor diodes yields an almost threefold relative tuning bandwidth.},
language = {en}
}
@inproceedings{LenkSchottHilsenbecketal.,
author = {Lenk, Friedrich and Schott, Matthias and Hilsenbeck, Jochen and Heinrich, Wolfgang},
title = {Optimizing MMIC reflection-type oscillators},
series = {2004 IEEE MTT-S International Microwave Symposium digest, June 6 - 11, 2004, Fort Worth Convention Center, Fort Worth, Texas, vol. 3},
booktitle = {2004 IEEE MTT-S International Microwave Symposium digest, June 6 - 11, 2004, Fort Worth Convention Center, Fort Worth, Texas, vol. 3},
publisher = {IEEE Service Center},
address = {Piscataway, NJ},
isbn = {0-7803-8331-1},
doi = {10.1109/MWSYM.2004.1338816},
pages = {1341 -- 1344},
abstract = {In this paper, optimization of the loaded quality factor QL for reflection-type HBT oscillator is investigated. Main result is an optimum relation between the S parameter phases at the three transistor ports. To support this finding, a 35.5 GHz MMIC VCO phase noise better than -85 dBc/Hz at 100 kHz offset frequency is demonstrated.},
language = {en}
}
@inproceedings{SchottLenkMelianietal.,
author = {Schott, Matthias and Lenk, Friedrich and Meliani, Chafik and Heinrich, Wolfgang},
title = {Low phase noise X-band push-push oscillator with frequency divider},
series = {2005 IEEE MTT-S International Microwave Symposium, June 12 - 17, 2005, Long Beach, CA},
booktitle = {2005 IEEE MTT-S International Microwave Symposium, June 12 - 17, 2005, Long Beach, CA},
publisher = {IEEE Operations Center},
address = {Piscataway, NJ},
isbn = {0-7803-8845-3},
doi = {10.1109/MWSYM.2005.1516986},
abstract = {A MMIC Colpitts oscillator in push-push configuration with integrated frequency divider using InGaP/GaAs HBTs is presented. The output is taken from the second harmonic port while the fundamental signal is fed to a frequency divider by two thus providing a reference signal at one quarter of the output frequency. The MMIC VCO reaches state-of-the-art phase-noise performance in X-band down to -120dBc/Hz at 1MHz offset frequency at high output power and a tuning range of 4\%.},
language = {en}
}
@misc{LenkSchottHilsenbecketal.,
author = {Lenk, Friedrich and Schott, Matthias and Hilsenbeck, Jochen and Heinrich, Wolfgang},
title = {A new design approach for low phase-noise reflection-type MMIC oscillators},
series = {IEEE transactions on microwave theory and techniques},
volume = {52},
journal = {IEEE transactions on microwave theory and techniques},
number = {12},
issn = {0018-9480},
doi = {10.1109/TMTT.2004.837319},
pages = {2725 -- 2731},
abstract = {In this paper, optimization of the loaded quality factor QL for reflection-type heterojunction bipolar transistor (HBT) oscillators is investigated. The main result is an optimum relation between the S-parameter phases at the three transistor ports. A new design strategy for this type of oscillator is proposed. The analysis is verified by comparing several Ka-band monolithic-microwave integrated-circuit oscillators in GaAs HBT technology with different resonators. The measured loaded QL values correspond to the measured phase noise of the circuits. At an oscillation frequency of 33 GHz, an excellent phase noise of -87 dBc/Hz at 100-kHz offset frequency is achieved over the whole tuning range.},
language = {en}
}