A Ka-band monolithic low phase noise coplanar waveguide oscillator using InAlAs/InGaAs HBT

A Ka-band oscillator has been designed, fabricated and tested using InAlAs/InGaAs HBTs. Coplanar waveguide technology has been employed to improve the Q-factor of the circuit. An output power of 2.6 dBm with DC to RF conversion efficiency of 7.8% was measured at 31.7 GHz. Low phase noise of � 87 and � 112 dBc/Hz were achieved at an offset frequency of 100 kHz and 1 MHz respectively. These low phase noise values can be attributed to the low 1=f noise of the InAlAs/InGaAs HBT devices and the coplanar design used for the circuit. 2002 Elsevier Science Ltd. All rights reserved.

[1]  Dimitris Pavlidis,et al.  Direct calculation of the HBT equivalent circuit from measured S-parameters , 1992, 1992 IEEE Microwave Symposium Digest MTT-S.

[2]  G. S. Dow,et al.  Low phase noise millimeter-wave frequency sources using InP-based HBT MMIC technology , 1996 .

[3]  Kevin W. Kobayashi,et al.  A coplanar waveguide InAlAs/InGaAs HBT monolithic Ku-band VCO , 1995 .

[4]  D. Pavlidis,et al.  High power performance using InAlAas/InGaAs single heterojunction bipolar transistors , 2000, Conference Proceedings. 2000 International Conference on Indium Phosphide and Related Materials (Cat. No.00CH37107).

[5]  Masahiro Muraguchi,et al.  A 15-GHz monolithic low phase noise VCO using AlGaAs/GaAs HBT , 1991, [1991] GaAs IC Symposium Technical Digest.

[6]  W. Heinrich,et al.  26 GHz coplanar SiGe MMICs , 1996, 1996 IEEE MTT-S International Microwave Symposium Digest.

[7]  Kevin W. Kobayashi,et al.  InP based HBT millimeter-wave technology and circuit performance to 40 GHz , 1993, IEEE 1993 Microwave and Millimeter-Wave Monolithic Circuits Symposium Digest of Papers.

[8]  W. Heinrich,et al.  A coplanar 38-GHz SiGe MMIC oscillator , 1996 .

[9]  T. Block,et al.  Monolithic 77- and 94-GHz InP-based HBT MMIC VCOs , 1997, 1997 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Technical Papers.