论文信息 - A monolithic broadband 10-50 GHz distributed HEMT mixer including active LO-RF combiner

A monolithic broadband 10-50 GHz distributed HEMT mixer including active LO-RF combiner

A millimeter-wave GaAs HEMT MMIC distributed mixer covering the RF frequency range from 10 to 50 GHz with IF frequencies from several MHz to 5 GHz was developed. The active devices are AlGaAs-GaAs HEMTs with a gatelength of 0.2 /spl mu/m and a gatewidth of 2/spl times/25 /spl mu/m. The conversion gain of the mixer is better than -3 dB over the frequency range at an LO power of less than 5 dBm without IF amplification. The RF and the LO signals are fed through an active distributed combiner with 2 dB gain and LO to RF port isolation of 20 dB. The size of the single mixer is 1.5/spl times/1 mm/sup 2/ and of the combiner including bias networks is 2/spl times/1 mm/sup 2/. An integrated broadband mixer chip including the LO and RF combiner was fabricated with a size of 4/spl times/1 mm/sup 2/.

D. Hollmann | G. Baumann | R. Heilig

[1] R. Anholt,et al. Equivalent-circuit parameter extraction for cold GaAs MESFET's , 1991 .

[2] M. Glenn,et al. 5-100 GHz InP coplanar waveguide MMIC distributed amplifier , 1990 .

[3] C. S. Aitchison,et al. A Very Wide-Band Microwave MESFET Mixer Using the Distributed Mixing Principle , 1985 .

[4] Manfred Berroth,et al. High-frequency equivalent circuit of GaAs FETs for large-signal applications , 1991 .

[5] Guido Baumann,et al. A monolithic 1-55 GHz HEMT distributed amplifier in coplanar waveguide technology , 1993, 1993 23rd European Microwave Conference.

[6] P. Tasker,et al. Design and characterization of high performance 60 GHz pseudomorphic MODFET LNAs in CPW-technology based on accurate S-parameter and noise models , 1992, IEEE 1992 Microwave and Millimeter-Wave Monolithic Circuits Symposium Digest of Papers.

[7] R. Majidi-Ahy,et al. 4-40 GHz MMIC distributed active combiner with 3 dB gain , 1992 .

[8] Michael Schlechtweg,et al. A nonlinear HEMT model for the design of frequency doubler and mixer circuits , 1994, Third International Workshop on Integrated Nonlinear Microwave and Millimeterwave Circuits.

[9] Michael Schlechtweg,et al. Design and characterization of high performance 60 GHz pseudomorphic MODFET LNAs in CPW-technology based on accurate S-parameter and noise models , 1992 .