TY - CHAP A1 - Schott, Matthias A1 - Lenk, Friedrich A1 - Meliani, Chafik A1 - Heinrich, Wolfgang T1 - Low phase noise X-band push-push oscillator with frequency divider T2 - 2005 IEEE MTT-S International Microwave Symposium, June 12 - 17, 2005, Long Beach, CA N2 - 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%. Y1 - 2005 SN - 0-7803-8845-3 U6 - https://doi.org/10.1109/MWSYM.2005.1516986 PB - IEEE Operations Center CY - Piscataway, NJ ER - TY - CHAP A1 - Meliani, Chafik A1 - Lenk, Friedrich A1 - Heinrich, Wolfgang T1 - 24 GHz Low Power VCOs and Analog Frequency Dividers T2 - IEEE MTT-S International Microwave Symposium digest, 11 - 16 June 2006, San Francisco, CA N2 - 24 GHz VCOs and frequency dividers with very low power consumption are presented. The circuits are realized as GaAs HBT MMICs. They comprise a VCO with high efficiency >17% and 12% tuning range at only 18 mW DC consumption as well as several frequency dividers. In order to minimize power consumption, the latter use the injection-locked frequency-divider (ILFD) concept. Divider ratios of 2 and 4 are realized, power consumption as low as 25 mW for a divider-by-2 is achieved. This demonstrates the capabilities of the analog concept in realizing dividers for mm-wave frequencies at DC consumption levels far below their digital counterparts Y1 - 2006 SN - 0-7803-9541-7 U6 - https://doi.org/10.1109/MWSYM.2006.249744 SP - 1801 EP - 1804 PB - IEEE Operations Center CY - Piscataway, NJ ER - TY - GEN A1 - Lenk, Friedrich A1 - Schott, Matthias A1 - Hilsenbeck, Jochen A1 - Heinrich, Wolfgang T1 - A new design approach for low phase-noise reflection-type MMIC oscillators T2 - IEEE transactions on microwave theory and techniques N2 - 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. Y1 - 2004 U6 - https://doi.org/10.1109/TMTT.2004.837319 SN - 0018-9480 VL - 52 IS - 12 SP - 2725 EP - 2731 ER -