SPDT (CE)

Single-pole two-position switch.

blockType: SubSystem

Path in the library:

/RF/Circuit Envelope/Junctions/SPDT (CE)

Description

Block SPDT (CE) simulates a single-pole two-position switch. This unit supports both reflective and absorption switches. The control signal is a signal Engee connected to the Vctl port of the unit. The control signal determines which output port transmits the input signal In:

If the control voltage is less than the threshold voltage, the unit transmits the input signal to the first output port Out1.
If the control voltage is greater than or equal to the threshold voltage, the unit transmits the input signal to the second output port Out2.

Two different resistors regulate the conduction path to transfer the input signal from the input port to any of the output ports.

Ports

Input

# Vctl — control signal
scalar

Details

Control signal Engee, set as a scalar.

Data types	`Float64`
Complex numbers support	No

Conserving

# In — The input signal
electricity

Details

The electrical port connected to the input signal.

Program usage name

In

# Ref — electrical port
electricity

Details

The reference electrical port relative to which the input and output resistances are set.

Program usage name

Ref

# Out1 — the first output signal
electricity

Details

The electrical port connected to the output signal when the control voltage is less than the threshold voltage.

Program usage name

Out1

# Out2 — the second output signal
electricity

Details

An electrical port connected to the output signal when the control voltage is greater than or equal to the threshold voltage.

Program usage name

Out2

Parameters

# Threshold voltage, V — Threshold voltage

Details

The switch’s threshold voltage, set as a positive scalar in volts.

Default value	`0`
Program usage name	`V_threshold`
Tunable	No
Evaluatable	Yes

# Characterization — switch characteristics
Resistance | Insertion loss

Details

The characteristic of the switch, set as Resistance or Insertion loss.

Values	`Resistance` \| `Insertion loss`
Default value	`Resistance`
Program usage name	`characterization_type`
Tunable	No
Evaluatable	Yes

# On resistance, Ohm — resistance in the open state

Details

The value of the resistance of the switch in the open state, set as a positive scalar in ohms.

Dependencies

To use this parameter, set for the parameter Characterization meaning Resistance.

Default value	`10`
Program usage name	`R_on`
Tunable	No
Evaluatable	Yes

# Off resistance, Ohm — resistance in the closed state

Details

The value of the switch resistance in the closed state, set as a positive scalar in ohms.

Dependencies

To use this parameter, set for the parameter Characterization meaning Resistance.

Default value	`1.0e6`
Program usage name	`R_off`
Tunable	No
Evaluatable	Yes

# Insertion loss (dB) — insertion loss

Details

The value of the insertion loss of the switch, set as a positive scalar in dB.

Dependencies

To use this parameter, set for the parameter Characterization meaning Insertion loss.

Default value	`1`
Program usage name	`insertion_loss`
Tunable	No
Evaluatable	Yes

# Isolation (dB) — the value of insulation losses

Details

The value of the insulation loss of the switch, set as a scalar in dB.

Dependencies

To use this parameter, set for the parameter Characterization meaning Insertion loss.

Default value	`70`
Program usage name	`isolation_loss`
Tunable	No
Evaluatable	Yes

# Loading type — type of load
Reflective | Absorptive

Details

The type of switch load, set as Reflective or Absorptive.

Values	`Reflective` \| `Absorptive`
Default value	`Reflective`
Program usage name	`load_type`
Tunable	No
Evaluatable	Yes

# Port terminations, Ohm — port resistance

Details

Port resistance corresponding to the block impedance SPDT (CE), defined as a scalar in Ohms or a vector of length 3 with the unit of measurement of each element in Ohms. If the value is a scalar, then all three impedances (input port and two output ports) are the same. If the value is a vector, then the first element represents the required matching on the input port of the block, and the other two elements must be identical and represent the required matching on the two output ports.

Dependencies

To use this parameter, set for the parameter Characterization meaning Insertion loss or for the parameter Loading type meaning Absorptive.

Default value	`50`
Program usage name	`Z0`
Tunable	No
Evaluatable	Yes

Additional Info

Volt-ampere characteristic

Details

The voltage-ampere characteristic at the terminals depends on the ratio between and — control voltage of the input signal Engee and the parameter value Threshold voltage, V the switch, respectively.

If :
If :

where

, , — currents in the input port and in the two output ports, respectively;
, — the voltage between the input port and the first and second output ports, respectively;
, — the voltage at the first and second output ports, respectively;
, — open and closed state conductivity;
, — conductivity in the parallel port.

Volt-ampere characteristic of the Switch unit (CE)

Details

Volt-ampere characteristic for the unit Switch (CE) or a controlled resistor:

if :
if :

where

— resistance in the closed state;
— resistance in the open state;
— input signal Engee;
— parameter value Threshold voltage, V the switch.

If , and , then the switch is on.

If , and , then the switch is off.