A DESIGN METHOD FOR LUMPED BROAD-BAND MMIC MATCHING NETWORKS WITH SEMIUNIFORM FREQUENCY-DEPENDENT LOSSES

A new design method for broad-band MMIC matching networks, which consi st of lumped inductors and capacitors, is presented in this paper. Bas ed on the fictitious transformation between the lossy network and the lossless one [6] the transducer power gain (TPG) of the lossy network is calculated using impedance matrix and transmission parameter matrix methods. Then, on the basis of the result of TPG optimization, the ma tching network can be synthesized. Since only the complexity of the ma tching network needs to be specified, so the ad-vantage of the ''real frequency technique'' [5] is retained. In this design procedure the fr equency-dependent losses of lumped elements can be considered. Thus th e actual gain response tends to coincide with the desired performance more than when the losses of elements are neglected. An example is giv en to show the application of the new method to broad-band GaAs FET am plifier design.