BROADBAND SMALL SIZE BALUN BUILT WITH LUMPED COMPONENTS
Konferensbidrag (offentliggjort, men ej förlagsutgivet), 2003

This paper reports on a small size broadband lumped element balun suitable for integration in MMICs. The design is an extension of the well known lattice balun, which independent of frequency has 180 degrees phase difference between the output ports, but suffers from a narrow amplitude bandwidth. It is shown how the amplitude bandwidth of the lattice balun may be improved by replacing inductors with low-pass T-sections, and the capacitors with high-pass T-sections. Scalable closed-form design equations for various bandwidths are derived. To validate the concept a prototype operating at 1 GHz has been fabricated with SMT chip components soldered on a PTFE laminate. It exhibits amplitude balance better than +or-0.25 dB and phase balance better than +or-8 degrees , over more than one octave bandwidth. The effective chip-area is 7*9 mm/sup 2/

surface mount technology

prototypes

inductors

high-pass filters

low-pass filters

baluns

MMIC

capacitors

Författare

Dan Kuylenstierna

Institutionen för mikroelektronik och nanovetenskap

Peter Linner

Institutionen för mikroelektronik och nanovetenskap

Gigahertz 2003 Proceedings

Ämneskategorier

Elektroteknik och elektronik

ISBN

0780383311