Unfamiliar RF BJT terminology - help please

[amal banerjee]

Could some electronics guru on this newsgroup please
clarify this a bit ?

The S parameters listed for the RF BJT BFU520 are
listed with reference to Vout, Iout. This is unfamiliar.
to me. Assuming the common emitter configuration,
is this the same as Vcollector, Ic ?

Thanks in advance.

 

[Phil Hobbs]

On 9/8/19 6:10 AM, amal banerjee wrote:

Could some electronics guru on this newsgroup please
clarify this a bit ?

The S parameters listed for the RF BJT BFU520 are
listed with reference to Vout, Iout. This is unfamiliar.
to me. Assuming the common emitter configuration,
is this the same as Vcollector, Ic ?

Thanks in advance.

S parameters have a standard definition, and IME are always quoted for
the common-emitter configuration since it's by far the most common in
the RF world. Thus the port connected to the base is port 1, and the
one connected to the collector is port 2.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[amal banerjee]

On Monday, September 9, 2019 at 12:00:58 AM UTC+5:30, Phil Hobbs wrote:

On 9/8/19 6:10 AM, amal banerjee wrote:
Could some electronics guru on this newsgroup please
clarify this a bit ?

The S parameters listed for the RF BJT BFU520 are
listed with reference to Vout, Iout. This is unfamiliar.
to me. Assuming the common emitter configuration,
is this the same as Vcollector, Ic ?

Thanks in advance.


S parameters have a standard definition, and IME are always quoted for
the common-emitter configuration since it's by far the most common in
the RF world. Thus the port connected to the base is port 1, and the
one connected to the collector is port 2.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

I agree that the common emitter configuration is the de-facto standard. Then can it be safely assumed that
Vout, Iout correspond to Vc, Ic
Vin, Iin correspond to Vbase, Ibase

Am I correct ?

It appears that semiconductor companies are in their
own world. The datasheet for BFR92A(another RF BJT
from NXP Semi.) has a list of Smith charts corresponding
to S11, S12 ... which is even more irritating,
becaase at best one can read off approximate values from the charts.