A fifth-order 880MHz/1.76GHz active lowpass filter for 60GHz communications in 40nm digital CMOS

Abstract

For the analog baseband section of a 60GHz receiver for fast download applications, two 5 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> order Butterworth filters with cutoff frequency of 880MHz and 1.76GHz for 60GHz radios are implemented in 40nm low power digital CMOS, using Sallen and Key biquads. Drawing 25/21mA from a 1.1V supply, an IIP3 of -13/-12dBV to -16.7/-18.3dBV and an input-referred noise of 320/280μVrms are measured for the 880/1760MHz filter.