TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Phase Hits Insensitive CSRO Y1 - 2006 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Multi-Mode Wideband Voltage Controlled Oscillators Y1 - 2006 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Technological Scaling and Minimazation of 1/f Nois in SiGe HBTs Coupled Mode N-Push Oscillator/VCO Y1 - 2006 ER - TY - JOUR A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. A1 - Schoepf, Juergen T1 - Cost-Effective VCOs Replace Power-Hungry YIGs Y1 - 2006 ER - TY - JOUR A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Technological Scaling and Minimization of 1/f Noise in Coupled Mode Oscillator For Wireless Systems Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Switching FET Broadband DBM for Wireless Applications Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Mode-Coupled Stubs-Tuned Planar Resonator Based Spectral Pure Signal Source for Wireless Communication Systems Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Reconfigurable Concurrent Oscillators for Multi-Band Multi-Mode Wireless Communication Systems Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Mode-Coupled Stubs-Tuned Planar Resonator Based Spectral Pure Signal Source for Wireless Communication Systems T2 - 2007 IEEE Sarnoff Symposium, Princeton, NJ, 30 April - 2 May 2007 Y1 - 2007 SN - 978-1-4244-2483-2 PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - RCO For Wireless Communication Systems Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - A Novel Compact Coupled Planar Resonator Based VCO Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Concurrent, Reconfigurable and Concurrent Oscillators For Multi-Band Multi-Mode Communication Systems Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Low Cost Configurable RF Signal Source For Wireless Applications Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Broadband, High Intercept Points Cost-Effective Power-Efficient Double Balanced Mixer (DBM) Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Stubs-Tuned Planar Coupled Resonator Based Spectral Pure Signal Source For Wireless Communication Systems Y1 - 2007 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. A1 - Schoepf, Juergen T1 - A Unifying Theory and Characterization of Microwave Oscillators/VCOs Y1 - 2005 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Configurable Ultra Low Ultra Wideband Power Efficient VCOs Y1 - 2005 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. A1 - Rebel, Reimund T1 - Ultra Low Noise Low Cost Octave-Band Hybrid-Tuned VCO Y1 - 2005 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Configurable Adaptive Ultra Low Noise Wideband VCOs Y1 - 2005 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - A Unified Method of Designing Low Noise Oscillator Y1 - 2005 ER - TY - CHAP A1 - Rohde, Ulrich L. T1 - Designing an Ultra Low Phase Noise 4.5 GHz VCO Using Multiple Coupled Resonators and MOS Devices Y1 - 2005 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Ultrawideband (UWB) RF Signal Source Y1 - 2005 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - Reconfigurable Wideband VCOs Y1 - 2005 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - MEMS Enabled VCO for Wireless Connectivity Y1 - 2005 ER - TY - CHAP A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. T1 - An Analytical Approach of Minimizing VCO Phase Noise Y1 - 2005 ER - TY - BOOK A1 - Rohde, Ulrich L. A1 - Rudolph, Matthias T1 - RF/Microwave Circuit Design for Wireless Applications Y1 - 2012 SN - 978-0-470-90181-6 PB - Wiley CY - Hoboken, NJ ET - 2. ed. ER - TY - GEN A1 - Poddar, Ajay K. A1 - Rohde, Ulrich L. A1 - Apte, Anisha M. T1 - How Low Can They Go?: Oscillator Phase Noise Model, Theoretical, Experimental Validation, and Phase Noise Measurements T2 - IEEE microwave magazine Y1 - 2013 U6 - https://doi.org/10.1109/MMM.2013.2269859 VL - 14 IS - 6 SP - 50 EP - 72 ER - TY - GEN A1 - Poddar, Ajay K. A1 - Rohde, Ulrich L. A1 - Apte, Anisha M. T1 - Getting Its Measure: Oscillator Phase Noise Measurement Techniques and Limitations T2 - IEEE microwave magazine Y1 - 2013 U6 - https://doi.org/10.1109/MMM.2013.2269860 VL - 14 IS - 6 SP - 73 EP - 86 ER - TY - GEN A1 - Apte, Anisha M. A1 - Poddar, Ajay K. A1 - Rudolph, Matthias A1 - Rohde, Ulrich L. T1 - A Novel Low Phase Noise X-Band Oscillator T2 - IEEE Microwave Magazine Y1 - 2015 U6 - https://doi.org/10.1109/MMM.2014.2367957 SN - 1527-3342 VL - 16 IS - 1 SP - 127 EP - 135 ER - TY - GEN A1 - Apte, Anisha M. A1 - Rohde, Ulrich L. A1 - Poddar, Ajay K. A1 - Rudolph, Matthias T1 - Optimizing Phase-Noise Performance: Theory and Design Techniques for a Crystal Oscillator T2 - IEEE Microwave Magazine Y1 - 2017 U6 - https://doi.org/10.1109/MMM.2017.2679998 SN - 1527-3342 VL - 18 IS - 4 SP - 108 EP - 123 ER - TY - GEN A1 - Griebel, Wolfgang A1 - Rudolph, Matthias A1 - Rohde, Ulrich L. T1 - Added Noise in Oscillators Caused by the Transistor Base Emitter Breakdown Phenomenon T2 - IETE Journal of Research Y1 - 2020 U6 - https://doi.org/10.1080/03772063.2020.1847702 SN - 0974-780X SP - 1 EP - 11 ER - TY - BOOK A1 - Vendelin, George D. A1 - Pavio, Anthony M. A1 - Rohde, Ulrich L. A1 - Rudolph, Matthias T1 - Microwave circuit design:using linear and nonlinear techniques Y1 - 2021 SN - 978-1-118-44975-2 SN - 978-1-119-74169-5 PB - Wiley CY - Hoboken, N.J. ET - Third edition ER - TY - GEN A1 - Rudolph, Matthias A1 - Beleniotis, Petros A1 - Zervos, Christos A1 - Rohde, Ulrich L. A1 - Andrei, Cristina T1 - Determining GaN HEMT trap models from MHz load-line measurement : a case study T2 - 2024 15th German Microwave Conference (GeMiC) Y1 - 2024 U6 - https://doi.org/10.23919/GeMiC59120.2024.10485297 SP - 29 EP - 32 PB - IEEE ER - TY - GEN A1 - Kared, Trusha A1 - Silaghi, Helga A1 - Rudolph, Matthias A1 - Silaghi, Andrei A1 - Rohde, Ulrich L. T1 - Design of a fixed IF down-conversion double-balanced mixer for UHF band applications T2 - Sensors N2 - This paper presents a new SiGe HBT-based high dynamic range double-balanced down-conversion differential mixer. Operating within the 0.5 GHz to 1.8 GHz range, the suggested mixer is appropriate for a variety of applications, such as cellular base stations, satellite communication (SATCOM), and military radar. The down-conversion mixer is made up of a single-ended to a differential-balanced radiofrequency (RF) stage, a dual feedback linearization for the RF stage, a local oscillator (LO) balun, LO mixing cores, and a fixed intermediate frequency (IF)-tuned circuit connected between two outputs to serve as a load at 145 MHz. Compared to earlier research in the literature, the measured SSB noise figure is approximately 7 dB ± 0.4 dB, and the measured conversion gain is approximately 12 dB ± 1 dB for a full band of operation. The mixer achieves a good return loss of over 8 dB for an RF and LO port in the desired band and a measured return loss of over 18 dB at 145 MHz and IF frequency. Furthermore, the design achieved an RF-to-IF isolation of greater than 35 dB, LO feedthrough, and an LO leakage isolation of better than 50 dB. Lastly, the measured third-order intercept point was found to be +4.7 dBm, and the 1 dB compression point was approximately −8 dBm. These results demonstrate good linearity performance. KW - Military radar KW - Satellite communication (SATCOM) KW - Cellular base stations KW - Mixer KW - Lo balun KW - Impedance matching Y1 - 2025 U6 - https://doi.org/10.3390/s25030608 SN - 1424-8220 VL - 25 IS - 3 SP - 1 EP - 29 PB - MDPI CY - Basel ER - TY - GEN A1 - Beleniotis, Petros A1 - Andrei, Cristina A1 - Zervos, Christos A1 - Rohde, Ulrich L. A1 - Rudolph, Matthias T1 - GaN trap model extraction based on MHz load-line measurements T2 - 2025 IEEE/MTT-S International Microwave Symposium - IMS 2025 N2 - The extraction of model parameters for GaN HEMTs is a challenging task that typically requires a comprehensive series of pulsed measurements to ensure that the resulting model is both accurate and convergence-stable. This study introduces, for the first time, an extraction procedure that utilizes I-V curves generated by MHz load-line measurements, effectively replacing the complex and time-intensive pulsed measurements. A drain-lag model extraction was based on load-line I-V curves and validated along with a pulsed-IV-based model through RF large-signal simulations, demonstrating excellent performance. KW - GaN KW - Compact model KW - Load-line KW - Model parameter extraction Y1 - 2025 SN - 979-8-3315-1409-9 U6 - https://doi.org/10.1109/IMS40360.2025.11104000 SP - 1059 EP - 1062 PB - IEEE CY - Piscataway, NJ ER - TY - GEN A1 - Beleniotis, Petros A1 - Andrei, Cristina A1 - Rohde, Ulrich L. A1 - Rudolph, Matthias T1 - Determining GaN HEMT trap models from MHz load-line measurement — synthesis and evaluation T2 - 2025 16th German Microwave Conference (GeMiC) N2 - The modeling of GaN HEMTs is closely associated with pulsed measurements, which are essential for extracting model parameters related to trapping and thermal effects. However, these characterizations are often hindered by high costs and the time-intensive nature of the measurement process. In this paper, we present and evaluate a novel approach for trap model extraction that utilizes MHz load-line measurements. Our analysis includes a comparative study of the measurements and a demonstration of modeling based on the proposed methodology. KW - Compact modeling KW - Load-line KW - Model parameter extraction KW - GaN HEMT KW - ASM-HEMT Y1 - 2025 SN - 978-3-9820397-4-9 U6 - https://doi.org/10.23919/GeMiC64734.2025.10978988 SP - 451 EP - 454 PB - IEEE CY - Piscataway, NJ ER -