A sophisticated analysis procedure for an MMIC phase shifter

This paper describes a new analysis procedure for a highpass and lowpass (HP/LP) filter type MMIC phase shifter consisting of switching GaAs MESFETs. This paper reveals that a specially designed large signal model for a switching MESFET, described by a gate bias dependent equivalent circuit, is the key to realizing an accurate nonlinear simulation of the HP/LP filter type phase shifter. The new analysis procedure realizes a highly accurate phase shifter analysis for both linear and nonlinear simulations. A comparison between the analysis results and measurement results for the phase shifter shows excellent agreement.