Amplificadores MMIC en la banda Ka de banda ancha

This paper describes the design and assembly of two low noise wideband monolithic Ka-Band amplifiers. The designs are fully monolithic. Philips Microwave Limeil ED02AH process, which employs a 0.2 µm Pseudomorphic-High Electron Mobility Transistor (P-HEMT) was the technology chosen. One amplifier has four stages and the other has three stages. A first stage with inductive source feedback has been used to achieve a low noise performance with reasonable gain and return loss and parallel feedback has been used in the last stages to five an upward slope to the gain. The circuit has been measured in a home made test fixture with ridged waveguide (WR-28) own designed transitions to couple the signal from waveguide to microstrip. A gain greater than 12dB with an average noise of 2.3dB from 28GHz to 36 GHz and a minimum noise figure of 1.8 dB at 29.5 dB was measured for the four stages MMIC amplifier.