Semidistributed model of millimeter-wave FET for parameter and noise figure predictions

A method for the determination of a distributed FET noise model based on matched‐source noise‐figure measurements

“…Likewise, R n is somewhat higher and ͉⌫ opt ͉ somewhat smaller for the distributed model than for the lumped model, while ⌽ opt remains nearly invariable. These results are mainly due to the thermal effects of the electrodes, according to previous works in the literature [10,19], and, to a lesser extent, due to the differences between the topologies assumed in each model.…”

“…To model the distributed effects in FETs, a distributed model composed by N equal elemental sections (slices) is considered here [6,10,11]. The circuit elements, associated with an elemental section of width WЈ u , are shown in Figure 2.…”

“…Moreover, to improve the model accuracy, it is assumed that the intrinsic noise-correlation matrix elements have a frequency dependence given by a smooth, low-order polynomial [9]. The distributed model is based in the so-called sliced model [6,10,11]. As a particular case, the uncorrelated "noise temperature" model [12] is also determined by using the proposed method.…”

Advantageous of electrode loading of a FET in mixer application

“…For distributed modeling of FETs in linear regime, there have been a few works, which the best one seems to be [9], however for the nonlinear case the papers are rare [10][11].…”

“…The sliced model of the device has been shown in Fig.1. For the passive part, the linear scaling rule [9] is used. This part contains the parasitic external elements, the skin effect elements and the passive coupling elements.…”