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HSMS-286E Datasheet(PDF) 9 Page - AVAGO TECHNOLOGIES LIMITED |
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HSMS-286E Datasheet(HTML) 9 Page - AVAGO TECHNOLOGIES LIMITED |
9 / 18 page 9 Two SMA connectors (E.F. Johnson 142‑0701‑631 or equivalent), a high‑Q capacitor (ATC 100A101MCA50 or equivalent), miscellaneous hardware and an HSMS‑286B are added to create the test circuit shown in Figure 16. The calculated input impedance for this network is shown in Figure 17. Figure 19. Input Impedance. Modified 2.45 GHz Circuit. This does indeed result in a very good match at midband, as shown in Figure 20. HSMS-0005 fig 21 was 18 FREQUENCY (GHz): 2.3-2.6 HSMS-285X fig 22 was 19 2.3 -20 FREQUENCY (GHz) 2.45 0 -10 -15 2.6 -5 HSMS-0005 fig 23 was 20 FREQUENCY (GHz): 2.3-2.6 2.45 GHz HSMS-285X fig 24 was 21 2.3 -20 FREQUENCY (GHz) 2.45 0 -10 -15 2.6 -5 Figure 17. Input Impedance, 3 µA Bias. The corresponding input match is shown in Figure 18. As was the case with the lower frequency design, bandwidth is more than adequate for the intended RFID application. Figure 18. Input Return Loss, 3 µA Bias. A word of caution to the designer is in order. A glance at Figure 17 will reveal the fact that the circuit does not provide the optimum impedance to the diode at 2.45 GHz. The temptation will be to adjust the circuit elements to achieve an ideal single frequency match, as illustrated in Figure 19. Figure 20. Input Return Loss. Modified 2.45 GHz Circuit. However, bandwidth is narrower and the designer runs the risk of a shift in the midband frequency of his circuit if there is any small deviation in circuit board or diode characteristics due to lot‑to‑lot variation or change in temper‑ature. The matching technique illustrated in Figure 17 is much less sensitive to changes in diode and circuit board processing. 5.8 GHz Detector Circuit A possible design for a 5.8 GHz detector is given in Figure 21. 20 pF VIDEO OUT RF INPUT WIDTH = 0.016" LENGTH = 0.037" WIDTH = 0.045" LENGTH = 0.073" TRANSMISSION LINE DIMENSIONS ARE FOR MICROSTRIP ON 0.032" THICK FR-4. Figure 21. 5.8 GHz Matching Network for the HSMS-286x Series at 3 µA Bias. |
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