<i>W</i>-Band 6-Bit Active Phase Shifter Using Differential Lange Coupler in SiGe BiCMOS
Kateryna Smirnova, Mark van der Heijden, Xin Yang, Konstantinos Giannakidis, D.M.W. Leenaerts, Ahmet Çağrı Ulusoy
Abstract
This letter presents a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula> -band vector-modulator-based phase shifter with a 6-bit resolution, implemented in a SiGe:C BiCMOS technology. The phase shifter maintains the RMS amplitude and phase errors lower than 1 dB and 6.6°, respectively, for the frequency range of 86–106 GHz without digital calibration. The maximum average gain is 2.3 dB with the 3-dB bandwidth achieving 31 GHz. The circuit consumes 49 mW of power including the phase control circuitry from a 2.4-V supply voltage, 34 mW of which is used by the Gilbert cell. A novel compact differential Lange coupler is used as an IQ splitter. The core part occupies only 0.027 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> of the chip area.