Main Content

SPDT

Single pole double throw switch

  • Library:
  • RF Blockset / Circuit Envelope / Junctions

  • SPDT block

Description

The SPDT block models a single pole double throw switch. This block supports both reflective and absorptive switches. The control signal is a Simulink® signal connected to the Vctl port of the block. The control signal specifies which output port transmits the input signal, In.

  • If the control voltage is less than the threshold voltage, then the block transfers the input signal to the first output port, Out1.

  • If control voltage is greater than or equal to the threshold voltage, then the block transfers the input signal to the second output port, Out2.

Two different resistors regulate the conduction path for transferring the input signal from the input port to either output port.

Ports

Input

expand all

Simulink control signal, specified as a scalar.

Data Types: double

Parameters

expand all

Threshold voltage of the switch, specified as a positive scalar in volts.

Characterization of the switch, specified as Resistance or Insertion loss.

On resistance value of the switch, specified as a positive scalar in ohms. On resistance is available when you set Characterization to Resistance.

Off resistance value of the switch, specified as a positive scalar in ohms. Off resistance is available when you set Characterization to Resistance.

Insertion loss value of the switch, specified as a positive scalar in decibels. Insertion loss (dB) is available when you set Characterization to Insertion loss.

Isolation value of the switch, specified as a scalar in decibels. Isolation (dB) is available when you set Characterization to Insertion loss.

Loading type of the switch, specified as Reflective or Absorptive.

Port terminations that match the impedance conditions of the SPDT switch, specified as a scalar in ohms or a vector of size 1-by-3 with each element unit in ohms. If the value is a scalar, then all three ( input port and the two output port) impedances are same. If the value is a vector, the first value is the matching required at the inport of the block and the other two values must be identical and represent matching required at the two output ports.

Note

Port terminations is available when you set the SPDT switch Characterization to Insertion loss or when you set Loading type to Absorptive.

Select this parameter to internally ground and hide the reference terminals. To expose the reference terminals, clear this parameter. By exposing these terminal, you can connect them to other parts of your model.

More About

expand all

Introduced in R2015b