Wideband reflection type MMIC attenuator with constantphase
- 8 January 1998
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 34 (1) , 91-93
- https://doi.org/10.1049/el:19980071
Abstract
A method for reducing the unwanted insertion phase variation in an MMIC reflection type attenuator with wide bandwidth (≫ 20 GHz) is described. The analogue reflection type amplitude control circuit uses cold-FETs as variable resistance reflection terminations. At high frequencies, very high phase variation is unavoidable due to the parasitic voltage-dependent reactance. Instead of tuning-out the parasitic reactance of the cold-FET, a novel symmetrical control method is presented for a two-stage attenuator. The phase shift variations from each stage cancel each other by the use of ‘complementary’ control signals.Keywords
This publication has 4 references indexed in Scilit:
- A versatile vector modulator design for MMICPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Low-loss 360 degrees X-band analog phase shifterPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Analog reflection topology building blocks for adaptive microwave signal processing applicationsIEEE Transactions on Microwave Theory and Techniques, 1995
- A wide range analog MMIC attenuator with integral 180° phase shifterIEEE Transactions on Microwave Theory and Techniques, 1994