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HMPP-389T-TR2 Datasheet(PDF) 6 Page - Agilent(Hewlett-Packard) |
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HMPP-389T-TR2 Datasheet(HTML) 6 Page - Agilent(Hewlett-Packard) |
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6 / 11 page  6 Testing the HMPP-389T on the Demo-board Introduction The HMPP-389T PIN diode is a high frequency shunt switch. It has been designed as a smaller and higher performance version of the HSMP-389T (SC-70 package). The DEMO-HMPP-389T demo- board allows customers to evalu- ate the performance of the HMPP-389T without having to fabricate their own PCB. Since a shunt switch’s isolation is limited primarily by its parasitic induc- tance, the product’s true potential cannot be shown if a conventional microstrip pcb is used. In order to overcome this problem, a coplanar waveguide over ground-plane structure is used for the demo- board. The bottom ground-plane is connected to the upper ground traces using multiple via-holes. A 50 Ω reference line is provided at the top to calibrate the board loss. The bottom line allows the HMPP-389T diode to be tested as a shunt switch. Demo-board Preparation Since the performance of the shunt switch is ultimately limited by the demo-board, a short discussion of the constructional aspects will be beneficial. Edge- mounted SMA connectors (Johnson #142-0701-881) were mounted on both the reference and test lines. A special mounting technique has been used to minimize reflection at the pcb to connector interface. Prior to mounting, the connector pins were cut down to two pin diam- eters in length. Subsequently, the connector fingers were soldered to the upper ground plane (Figure 13). Solder was filled between the connector body and fingers on the lower ground plane until the small crescent of exposed teflon was completely covered (Figure 14). Figure 13. Soldering details of connector fingers to upper ground plane. Figure 14. Soldering details of connector fingers to lower ground plane. Test Results Measurements of the reference line’s return and insertion losses were used to gauge the effective- ness of the VSWR mitigating steps. In our prototype, the worst case return loss of the reference line was 20 dB at 5 GHz (Figure 15). FREQUENCY (GHz) 16 24 5 3 -18 -22 -26 -30 -34 -38 Figure 15. Swept return loss of reference line. Insertion loss of the reference was very low and generally, increased with frequency (Figure 16). If the demo-board has been constructed carefully, there should not be any evidence of resonance. The reference line’s insertion loss trace can be stored in the VNA’s display memory and used to correct for the insertion loss of the test line in the subsequent measurements. Figure 12. Demo-board DEMO-HMPP-389T. test line reference line Agilent SK063A HMPP-389T |
Similar Part No. - HMPP-389T-TR2 |
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Similar Description - HMPP-389T-TR2 |
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