Non-linear distortion analysis of Ka BAND MMIC’s under single-tone, TWO-TONE and NPR excitations.

An experimental comparative study of nonlinear distortion effects in 26-40 GHz frequency band on telecommunication MMIC’s subject to constant wave single-tone, two-tone and NPR excitations are presented in this paper. The study is performed using a wave-guide based power measurement setup previously developed and recently fully automated to allow very accurate analyses about nonlinear behaviour of PHEMT SSPA’s. The purpose of these studies is to determine the MMIC linearity performances at 29 GHz versus bias conditions. But also to improve the PHEMT technological parameters and the circuits designs as a function of the analyses

Influence of recess and epilayers in the 26 – 40 GHz band HEMT’s intermodulation

The comparison of the linearity performance for three PHEMTs have been investigated in Ka band. The studied transistors are a single recessed PHEMT, a double recessed PHEMT and a double recessed dual channel PHEMT. The main result is : at a given output power level, the double recess allows a large improvement of the intermodulation ratio (IMR), thanks to its higher drain-source bias voltage capability, compared to the single recess. The second result is : the double recessed PHEMTs comparison shows that the dual channel, thanks to a more wide and uniform ransconductance distribution than the single channel, is a better solution for linearity application at 26GHz

Full noise characterization of microwave devices. Application to GaAlAs/GaAs TEGFET

International audienc

A 26-40 GHz on wafer intermodulation measurement system

In this paper, a 26 - 40 GHz intermodulation measurement system is presented which permits intermodulation investigations together with load-pull measurements. The one-tone and two-tone responses of Ka PHEMT devices are compared. Inter Modulation Ratio (IMR) optimizations performed by adjusting the output load and bias settings show that it is possible to improve the IMR up to 5-6 dB at a constant output power level