SPST

Single pole single throw switch

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Libraries:
RF Blockset / Circuit Envelope / Junctions

Description

TheSPSTblock models a single pole single throw switch. This block supports both reflective and absorptive switches. The control signal is a Simulink^®signal connected to theVctlport of the block. The control signal specifies when the output port,Out, transmits the input signal at the input port,In.

Ports

Input

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Vctl—Simulink control signal
scalar

Simulink control signal, specified as a scalar.

Data Types:double

Parameters

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Threshold voltage—Threshold voltage
`0`(default) | positive scalar

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

Characterization—Characterization
`Resistance`(default) |`Insertion loss`

Characterization of the switch, specified asResistanceorInsertion loss.

On resistance—On resistance
`10`(default) | positive scalar

On resistance value of the switch, specified as a positive scalar in ohms.On resistance可当你准备好了吗CharacterizationtoResistance.

Off resistance—Off resistance
`1e-6`(default) | positive scalar

Off resistance value of the switch, specified as a positive scalar in ohms.Off resistance可当你准备好了吗CharacterizationtoResistance.

Insertion loss (dB)—Insertion loss
`1`(default) | scalar

Insertion loss value of the switch, specified as a positive scalar in decibels.Insertion loss (dB)可当你准备好了吗CharacterizationtoInsertion loss.

Isolation (dB)—Isolation value
`70`(default) | scalar

Isolation value of the switch, specified as a scalar in decibels.Isolation (dB)可当你准备好了吗CharacterizationtoInsertion loss.

Loading type—Loading type
`Reflective`(default) |`吸收`

Loading type of the switch, specified asReflectiveor吸收.

Port terminations (Ohm)—Port terminations
`50`(default) | scalar | vector of size 1-by-2

Port terminations that match the impedance conditions of theSPDTswitch, specified as a scalar in ohms or a vector of size 1-by-2 with each element unit in ohms. If the value is a scalar, then the input port and the output port impedances are the same. If the value is a vector, the first value is the matching required at the inport of the block and the second values is the matching required at the output port.

Note

Port terminations可当你准备好了吗theSPSTswitchCharacterizationtoInsertion lossor when you setLoading typeto吸收.

Ground and hide reference terminals—Ground RF circuit terminals
on (default) | off

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

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Resistance Characterization

If the control voltage is less than the threshold voltage, then the block attenuates the signal using the resistance value specified inOff resistance. The block places the resistor between the positive input and output terminals.
If the control voltage is greater than or equal to the threshold voltage, then the block attenuates the signal using the resistance value specified inOn resistance.
When the switch loading type is absorptive, and the control voltage is less than the threshold voltage, the block places internal shunt resistors at the input and output ports. The shunt resistor values provide matching terminations at the input and output ports.

Insertion Loss Characterization

If the control voltage is less than the threshold voltage, calculate the off resistance value using theIsolation (dB)value.
If the control voltage is greater than or equal to the threshold voltage, calculate the on resistance value using theInsertion loss (dB)value.
When the switch loading type is absorptive, and the control voltage is less than the threshold voltage, the block places internal shunt resistors at the input and output ports. The shunt resistor values provide matching terminations at the input and output ports.

Voltage–Current Relationship

The voltage–current relationship at the terminals depends on the relationship between control voltage,V_ctl, and the threshold voltage,V_threshold.

IfV_ctl<V_threshold

$\begin{array}{l} I_{i n} = V_{i n o u t} . G_{o f f}^{} + V_{i n} . G_{Z 01} \\ I_{o u t} = - V_{i n o u t} . G_{o f f} + V_{o u t} . G_{Z 02} \end{array}$
IfV_ctl≥V_threshold

$\begin{array}{l} I_{i n} = V_{i n 1} G_{o f f} + V_{i n 2} G_{o n} \\ I_{1} = - V_{i n 1} G_{o f f} + V_{1} G_{Z 01} \\ I_{2} = - V_{i n 2} G_{o n} \end{array}$

G_on,G_off— On and off path conductances
G_Z01,G_Z02- - - - - -上海unt port conductances

版本历史

Introduced in R2015b

SPST

Description

Ports

Input

Vctl—Simulink control signalscalar

Parameters

Threshold voltage—Threshold voltage0(default) | positive scalar

Characterization—CharacterizationResistance(default) |Insertion loss

On resistance—On resistance10(default) | positive scalar

Off resistance—Off resistance1e-6(default) | positive scalar

Insertion loss (dB)—Insertion loss1(default) | scalar

Isolation (dB)—Isolation value70(default) | scalar

Loading type—Loading typeReflective(default) |吸收

Port terminations (Ohm)—Port terminations50(default) | scalar | vector of size 1-by-2

Ground and hide reference terminals—Ground RF circuit terminalson (default) | off

More About

Resistance Characterization

Insertion Loss Characterization

Voltage–Current Relationship

版本历史

See Also

Vctl—Simulink control signal
scalar

Threshold voltage—Threshold voltage
`0`(default) | positive scalar

Characterization—Characterization
`Resistance`(default) |`Insertion loss`

On resistance—On resistance
`10`(default) | positive scalar

Off resistance—Off resistance
`1e-6`(default) | positive scalar

Insertion loss (dB)—Insertion loss
`1`(default) | scalar

Isolation (dB)—Isolation value
`70`(default) | scalar

Loading type—Loading type
`Reflective`(default) |`吸收`

Port terminations (Ohm)—Port terminations
`50`(default) | scalar | vector of size 1-by-2

Ground and hide reference terminals—Ground RF circuit terminals
on (default) | off