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A 6-Bit CMOS phase shifter for S - Band
, Article IEEE Transactions on Microwave Theory and Techniques ; Volume 58, Issue 12 PART 1 , 2010 , Pages 3519-3526 ; 00189480 (ISSN) ; Azizi, M ; Kiani, M ; Medi, A ; Atarodi, M ; Sharif University of Technology
Abstract
A 6-bit passive phase shifter for 2.5- to 3.2-GHz frequency band has been designed and implemented in a standard 0.18- μm CMOS technology. A new switched-network topology has been proposed for implementing the 5.625 ° phase shift step. The insertion loss of the circuit is compensated with an on-chip bidirectional amplifier. The measured return losses of the circuit are better than 8 dB with output 1-dB compression point of +9.5 dBm in the transmit mode and noise figure of 7.1 dB in the receive mode. The fabricated phase shifter demonstrates an average rms phase error of less than 2° over the entire operation bandwidth, which makes it suitable for high-precision applications