SPST (CE)

Single-pole single-position switch.

blockType: SubSystem

Path in the library:

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

Description

Block SPST (CE) simulates a single-pole single-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 when the output port Out transmits the input signal to the input port In.

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

# Out — The output signal
electricity

Details

The electrical port connected to the output signal.

Program usage name

Out

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 2 with the unit of measurement of each element in Ohms. If the value is a scalar, then the input and output port impedances are the same. If the value is a vector, then the first element represents the required matching at the input port of the block, and the second element represents the required matching at the output port.

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

Resistance characteristics

Details

If the control voltage is less than the threshold voltage, the unit attenuates the signal using the resistance set in the parameter Off resistance, Ohm. The unit places a resistor between the positive input and output ports.
If the control voltage is greater than or equal to the threshold voltage, the unit attenuates the signal using the resistance set in the parameter On resistance, Ohm.
If the switch load type is absorption and the control voltage is less than the threshold voltage, the unit places internal parallel resistors on the input and output ports. The values of the parallel resistors ensure that the pins on the input and output ports are matched.

Characteristics of insertion loss

Details

If the control voltage is less than the threshold voltage, the unit calculates the value of the resistance in the closed state using the value of the parameter Isolation (dB).
If the control voltage is greater than or equal to the threshold voltage, the unit calculates the resistance value in the open state using the parameter value Insertion loss (dB).
If the switch load type is absorption and the control voltage is less than the threshold voltage, the unit places internal parallel resistors on the input and output ports. The values of the parallel resistors ensure that the pins on the input and output ports are matched.

Volt-ampere characteristic

Details

The volt-ampere characteristic at the terminals depends on the ratio between the control voltage and threshold voltage :

if :
if :

where

, — open and closed state conductivity;
, — conductivity in the parallel port.