2022-09-04 15:11 Status: #addto # quadrature allpass filter (QAF)  [^1] Becomes a stacked coil on an IC. ## Achieving Other Phase shifts The QAF can generate any phase difference by changing the values of the resistances. In general, $2R\times \zeta$ becomes $2\times tan^{-1}(1/\zeta)$ phase shifter. --- # References [^1]: [I Q Network](../../Spaces/Career/Companies/Millibeam/docs/references/Phase%20Shifters/An_Improved_Wideband_All-Pass_I_Q_Network_for_Millimeter-Wave_Phase_Shifters.pdf)