A pseudomorphic HEMT monolithic K-Band VCO

An appropriate nonlinear design methodology based on the optimisation of the load cycles, using the facilities of a commercial harmonic-balance software, is applied for a K-band monolithic varactor tunable oscillator (VCO) using 0.2 ¿m GaAlAs/GaInAs/GaAs Pseudomorphic HEMT technology. A tuning range over 14% bandwidth (22.4-25.8 GNz) is obtained, with a high sensitivity of 4.5 GHz/V.A constant output power of 6 dBm is measured over the tuning range. Markedly low phase noise level of ¿89 dBc/Nz at 100 KNz offset from the carrier (24.4 GHz) is achieved. To our knowledge, this is one of the lowest phase noise level reported for K-band solid state VCO.

[1]  J. Graffeuil,et al.  Microwave Oscillator Design from Load Cycle Optimisation, Application to MMIC GaAs Mesfet Oscillator , 1994, 1994 24th European Microwave Conference.

[2]  Xiangdong Zhang,et al.  Comparison of the phase noise performance of HEMT and HBT based oscillators , 1995, Proceedings of 1995 IEEE MTT-S International Microwave Symposium.

[3]  Peter Russer,et al.  Noise calculations and experimental results of varactor tunable oscillators with significantly reduced phase noise , 1995 .

[4]  H. Takahashi,et al.  A low-noise K-Ka band oscillator AlGaAs/GaAs heterojunction bipolar transistors , 1991 .

[5]  Gabriel M. Rebeiz,et al.  155- and 213-GHz AlInAs/GaInAs/InP HEMT MMIC oscillators , 1995 .

[6]  Masahiro Muraguchi,et al.  A 15-GHz monolithic low-phase-noise VCO using AlGaAs/GaAs HBT technology , 1992 .

[7]  U. Guttich,et al.  Ka-band monolithic VCOs for low noise applications using GaInP/GaAs HBTs , 1994, Proceedings of 1994 IEEE Microwave and Millimeter-Wave Monolithic Circuits Symposium.

[8]  D. Pons,et al.  Fully monolithic Ku and Ka-band GaInP/GaAs HBT wideband VCOs , 1994, Proceedings of 1994 IEEE Microwave and Millimeter-Wave Monolithic Circuits Symposium.

[9]  Kenichi Hosoya,et al.  A Millimeter Wave Monolithic VCO with an Integrated Heterojunction FET as a Varactor , 1994, 1994 24th European Microwave Conference.

[10]  C.C. Yang,et al.  12-40 GHz low harmonic distortion and phase noise performance of GaAs heterojunction bipolar transistors , 1988, 10th Annual IEEE (GaAs IC) Symposium, Gallium Arsenide Integrated Circuit. Technical Digest 1988..

[11]  G. S. Dow,et al.  A W-band source module using MMIC's , 1994 .