An L-Band 4-Bit RL/RC-Switched Active Phase Shifter Using Differential Switches

Kenji NAKAMURA  Yasushi ITOH  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E92-C   No.9   pp.1170-1175
Publication Date: 2009/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.1170
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies and Their Applications)
Category: 
Keyword: 
phase shifter,  differential,  microwave,  switch,  SiGe HBT,  

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Summary: 
An L-band 4-bit RL/RC-switched active phase shifter using differential switches is developed. It employs RL/RC circuits in the design of series feedback loops of the quadrature differential amplifier and achieves 90, 45, and 22.5of phase shift by switching on and off the RL/RC circuits alternatively. On the other hand, a 180phase shift is achieved with the use of a phase difference between the differential outputs. By cascading all four bits, an insertion gain of 16 to 23 dB, a phase error of less than 8.5, and an RMS phase error of 4.6have been achieved at 1 GHz.