help with the PNP and NPN control circuits

[assxdf]

i want to know the work of the circuit, please help me ,thanks

 

[tony_lth]

EN high, Q1 pass, Q1 collector low, so Q2 pass.
EN low, Q1 stop, Q1 collector=+5V, So Q2 stop.

 

[assxdf]

thanks tony ,i simulated the circuit using AWR Office, the result was wrong , whenever the EN is high or low, the output is always +5V.i'm so puzzled.

 

[betwixt]

Where is the output node? There isn't one on the diagram. Also, what is on the other side of the inductor?
As it stands, it isn't possible to simulate it
Brian.

 

[assxdf]

The other side of the inductor is a LNA,so what the voltage of the LNA? Can it be calculated up?
Thanks.

Where is the output node? There isn't one on the diagram. Also, what is on the other side of the inductor?
As it stands, it isn't possible to simulate it
Brian.

 

[FvM]

The other side of the inductor is a LNA,so what the voltage of the LNA?

The circuit is obviously intended as supply switch with the LNA as a load. For getting non-meaningless simulation results, you have to place at least a resistor representing the load, e.g. 1K. Then you can expect to see the switch operation.

 

[tony_lth]

In AWR you can place V_Probe at every node of Q1 and Q2, then you can check which node is not normal. SO to check your circuit.

If you simulate in ADS, you can replace Q1 and Q2 with real component model, such as BCW60 and BCW61 for NPN and PNP transistor, so you will get real result. And you can replace ferrite bead with inductor seriesing resistor.

Cheers.

PS:
Maybe 1K as load is too big, you can place a resistor=Vdd/Idd of LNA. This will give you more precise result.

 

[assxdf]

thank you, it's very helpful.