SP3T PIN Diode Switch

Rev. V1

MSW310x-310

11

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Calculations of Resistor Values

The magnitude of the forward bias current applied to the

series diode is set by the magnitude of the supply voltage

+VCC1, which is nominally 5 V, the value of resistor R1

and the forward voltage of the series diode, VDIODE,

among other factors. Given the desired current value, the

resistance is given by the formula:

It is important to note that the switch module

evaluation board, as supplied from the factory, is not

capable of handling RF input signals larger than 45

dBm. If performance of the switch under larger input

signals is to be evaluated, an adequate heat sink

must be properly attached to the evaluation board,

and several of the passive components on the board

must be changed in order to safely handle the

dissipated power as well as the high bias voltage

necessary for proper performance. Contact the

factory for recommended components and heat sink.

The magnitude of the current through the shunt

diode is set by the magnitude of the supply voltage

+VCC2, the value of resistor in series with the shunt

diode (R2 or R4 or R5)and the forward voltage of the

shunt diode, VDIODE, among other factors. Given

the desired current value, this resistance is given by

the formula: