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DEMO-HMPP-38X0 Datasheet(PDF) 8 Page - Broadcom Corporation. |
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DEMO-HMPP-38X0 Datasheet(HTML) 8 Page - Broadcom Corporation. |
8 / 12 page 8 To evaluate the HMPP-389T as shunt switch, it was mounted on the test line and then the appropriate bias- ing voltage was applied. In our prototype, the worst case return loss was 10 dB at 5 GHz (Figure 22). The return loss varied very little when the bias was changed from zero to -20V. Figure 19. Insertion loss of HMPP-389T at -20V. The PIN diode’s resistance is a function of the bias current. So, at higher forward current, the isolation improved. The combination of the HMPP-389T and the SK063A demoboard exhibited more than 17 dB of isolation from 1 to 6 GHz at If ≥ 1mA (Figure 25). Figure 17. Return Loss of HMPP-389T Mounted on Test Line at 0V and -20V Bias. FREQUENCY (GHz) -5 -15 -25 -35 -45 -55 1 6 2 4 5 3 Figure 18. Insertion Loss of HMPP-389T at 0V. FREQUENCY (GHz) 0 -0.2 -0.4 -0.6 -0.8 -1.0 1 6 2 4 5 3 Figure 19. Insertion Loss of HMPP-389T at -20V. FREQUENCY (GHz) 1 6 2 4 5 3 0 -0.2 -0.4 -0.6 -0.8 -1.0 Figure 20. Isolation at Different Frequencies with Forward Current as a Parameter. FREQUENCY (GHz) -10 -14 -18 -22 -26 -30 1 6 2 0.15 mA 0.25 mA 0.5 mA 1 mA 1.5 mA 20 mA 4 5 3 Figure 18. Return loss of HMPP-389T mounted on test line at 0V and -20V bias. Normalization was used to remove the pcb’s and connec- tors’ losses from the measurement of the shunt switch’s loss. The active trace was divided by the memorized trace (Data/Memory) to produce the normalized data. At zero bias, the insertion loss was under 0.6 dB up to 6 GHz (Figure 23). Applying a reverse bias to the PIN diode has the effect of reducing its parasitic capacitance. With a reverse bias of -20V, the insertion loss improved to better than 0.5 dB (Figure 24). Figure 18. Insertion loss of HMPP-389T at 0V. Figure 20. Isolation at different frequencies with forward current as a parameter. The combination of the HMPP-389T and the demo-board allows a high performance shunt switch to be constructed swiftly and economically. The extremely low parasitic inductance of the package allows the switch to operate over a very wide frequency range. Figure 16. Insertion Loss of Reference Line. FREQUENCY (GHz) 0 -0.2 -0.4 -0.6 -0.8 -1.0 1 6 2 4 5 3 Figure 16. Insertion loss of reference line. Insertion loss of the reference was very low and generally, increased with frequency (Figure 21). 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. |
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