کنفرانس مهندسی برق ایران

صفحه اصلی / سی امین کنفرانس بین المللی مهندسی برق

Improving Quarter-Wavelength Resonator Technique for Parasitic Cancellation of the ESD Protection Diode for High-Frequency Applications

نویسندگان :

Emadodin Zia Khodadadian¹ Mojtaba Joodaki²

1- Faculty of Engineering Ferdowsi University of Mashhad, Mashhad, Iran 2- Jacobs University of Bremen

کلمات کلیدی :

Transient voltage suppressor (TVS) diode ، electrostatic discharge ، quarter-wavelength transmission line (QWTL) ، Transmission line based parasitic cancellation method

چکیده :

In this research, an approach will be introduced to reduce the loading effect of TVS diode for RF and Microwave applications. Here, the quarter-wavelength transmission line (QWTL) is used as the parasitic capacitance loading effect suppressor. Four test circuits with four short-circuited QWTLs with characteristic impedances of 20, 30, 40, and 50  have been fabricated at operating frequency of 2.5GHz to study the frequency response of the suggested approach. The measured S11 of all four circuits is lower than -15 dB while the measured S21 is very near to 0 dB. These results confirm the minimal loading effect of the TVS diode on the RF performance in these circuits. Also, based on the frequency spectrum of the IEC 61000-4-2 test, the minimum frequency to implement the suggested method is determined, which is equal to 2GHz. Furthermore, three similar low noise amplifiers (LNAs) with three different protection circuits were realized to analyze the capability of the proposed approach and compare the results with those of the conventional protection method in which only a TVS diode is used and our previous work. For all LNAs, the S-parameter and noise figure were measured both before and after zapping IEC 61000-4-2 immunity test. All circuits were immune against electrostatic discharge but the protection circuit in our previous paper showed a more desirable frequency response, indicating an almost ideal performance among all three methods. However, we believe the approach presented in this work is superior because not only it shows an excellent electrical performance but it is very easy to implement and it does not require an accurate circuit model of the TVS.