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HMPP-386X Datasheet(PDF) 5 Page - Agilent(Hewlett-Packard) |
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HMPP-386X Datasheet(HTML) 5 Page - Agilent(Hewlett-Packard) |
5 / 8 page 5 Dielectric Relaxation Frequency and Diode Capacitance f DR (Dielectric Relaxation Fre- quency) for a PIN diode is given by the equation f DR = 1 2 πρε where… ρ = bulk resistivity of the I-layer ε = ε 0 εR = 10 -12 F/cm = bulk susceptance of silicon In the case of an epitaxial diode with a value for ρ of 10Ω-cm, f DR will be in Ku-Band. For a bulk diode fabricated on very pure material, ρ can be as high as 2000, resulting in a value of f DR of 80 MHz. The implications of a low f DR are very important in RF attenuator and switch circuits. At operating frequencies below f DR, reverse bias (as much as 50 V) is needed to minimize junction capacitance. At operating frequencies well above f DR, the curve of capacitance vs. reverse bias is flat. For the HMPP-386x family, f DR is around 500 MHz, resulting in very low capacitance at zero bias for frequencies above 1 GHz. See Figure 1. Figure 11. Linear Equivalent Circuit of the MiniPak PIN Diode. Linear Equivalent Circuit In order to predict the perfor- mance of the HMPP-386x as a switch or an attenuator, it is necessary to construct a model which can then be used in one of the several linear analysis pro- grams presently on the market. Such a model is given in Figure 11, where R S + Rj is given in Figure 2 and C j is provided in Figure 1. Careful examination of Figure 11 will reveal the fact that the package parasitics (inductance and capacitance) are much lower for the MiniPak than they are for leaded plastic packages such as the SOT-23, SOT-323 or others. This will permit the HMPP-386x family to be used at higher fre- quencies than its conventional leaded counterparts. 30 fF 30 fF 20 fF 20 fF 1.1 nH Single diode package (HMPP-3860) 2 3 1 4 30 fF 30 fF 20 fF 20 fF 12 fF 12 fF 0.5 nH Anti-parallel diode package (HMPP-3862) 2 3 1 4 0.5 nH 0.05 nH 0.5 nH 0.05 nH 0.05 nH 0.5 nH 0.05 nH 30 fF 30 fF 20 fF 20 fF 0.5 nH 0.05 nH Parallel diode package (HMPP-3865) 2 3 1 4 0.5 nH 0.05 nH 0.5 nH 0.05 nH 0.5 nH 0.05 nH MiniPak Outline Drawing 1.44 (0.058) 1.40 (0.056) Top view Side view Bottom view 1.20 (0.048) 1.16 (0.046) 0.70 (0.028) 0.58 (0.023) 1.12 (0.045) 1.08 (0.043) 3 2 4 1 0.82 (0.033) 0.78 (0.031) 0.32 (0.013) 0.28 (0.011) -0.07 (-0.003) -0.03 (-0.001) 0.00 -0.07 (-0.003) -0.03 (-0.001) 0.42 (0.017) 0.38 (0.015) 0.92 (0.037) 0.88 (0.035) 1.32 (0.053) 1.28 (0.051) 0.00 |
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