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Reducing the Insertion Loss of a Shunt PIN Diode - App Note

From Avago Technologies
 

 
A shunt PIN diode is often used as a switch or attenuator. The upper frequency limitation is determined by the increase in insertion loss as the diode capacitance starts to short out the load. Figure 1 shows a symmetrical matching circuit that extends this frequency limitation by incorporating the diode capacitance, C, into a low pass filter. Figure 2 shows the filter response when the inductance value, L, is chosen to form a Chebyshev equal ripple filter. L = R2C x g(1) / g(2) The constants g(1) and g(2) are low pass prototype element values, available in the literature [1,2] as a function of the ripple value shown in Figure 2. This filter is designed to operate between equal generator and load resistances, R. The cutoff frequency, fc, shown in Figure 2, is determined by the diode capacitance, the ripple value, and R.
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