Can you please help me simulate this preamplifier in ltspice?
It is from the page BFG135a BJT by Infineon (qsl.net)
But I do not have a model for this Infineon BFG135A
Thanks
Thanks for the link.
But what is an s2p file, this is not an ltspice file?
And I said Infineon not NXP, there are differences between the 2 devices. Read the question carefully please.
BFG135A has been discontinued by Infoneon more than 10 years ago. Be happy if you find a SPICE model of this or a similar transistor at all.
If the NXP model is s2p (table of s-parameters) it can't be used in SPICE simulator. According to discussions in LTspice user group, there has been at least a SPICE model of the Philips/NXP type available.
BFG135A has been discontinued by Infoneon more than 10 years ago. Be happy if you find a SPICE model of this or a similar transistor at all.
If the NXP model is s2p (table of s-parameters) it can't be used in SPICE simulator. According to discussions in LTspice user group, there has been at least a SPICE model of the Philips/NXP type available.
I wouldn't worry about the Vceo and Ic parameters, those are max ratings for the device which aren't relevant for simulation purposes. Most third party models won't define them, which results in LTspice displaying them as zero.
I wouldn't worry about the Vceo and Ic parameters, those are max ratings for the device which aren't relevant for simulation purposes. Most third party models won't define them, which results in LTspice displaying them as zero.
Thanks very much for this information, it is goot to know.
But if you measure the collector currents on LTSPICE and they exceed the Ic of the device, then you do have a problem don't you? So at your final design you should check if the collector currents are exceeded.
Do I get this right?
Yes.
Most SPICE simulators do not monitor the maximum current or voltage ratings of devices, so it's up to you to determine that they remain below the device limits
LTSPICE is not an appropriate simulator for RF Circuits.I suggest you to use QUCS for that kind of RF Experiments.
Also, your circuit is not so good, Gain Deviation is huge.
Thanks all!
My BFR92 RF amplifier collector current is like shown. From the datasheet, the Ic (DC) for the device is 25mA. But the collector current here varies from 8mA to 21.5mA (AC).
Would this be safe for the device (as the average current is lower) or not?