An efficient design approach of 5-bit digitally controlled phase shifter using 130nm SiGe based BiCMOS technology for Ka –band applications

Abstract

This paper present 5-bit digital controlled phase shifter using 130nm SiGe based BiCMOS technology. Three different approaches have used to achieve the desired phase shift with low insertion loss, accurate phase shift with good input and output return loss. The 180^◦bit of phase shifter has design using switch network topology. Bridge-T network   topology has used for designing of 22.5^◦, 45^◦ and 90^◦.Band pass topology has used for designing of 11.25^◦. These three different approaches make an efficient design approach for 5-bit Ka-band phase shifter designing in low cost technology. This circuit achieved better than -10.0dB of input and output return loss over 32 states at ka-band (35.5GHz-36.5GHz). This circuit achieved -13.789dB of insertion loss in reference state with less than 5.9 degree of r.m.s. phase error at  ka-band (35.5GHz-36.5GHz) .The layout dimension of circuit is 1.352x.636 mm² with all including pad.