AoE x-Chapters - 1x.2 Resistors

[Gerhard Hoffmann]

Am 02.09.19 um 23:51 schrieb Gerhard Hoffmann:

> O means base is open  and  S means base is shorted to E.

Ingrid would like to add:

If you give the carriers in the base an opportunity to silently
go away, they won't engage in an avalanche revolution.
In a cascode stage, for example, you can get healthy output
voltages from that transistor.

regards, Gerhard

 

[Gerhard Hoffmann]

Am 02.09.19 um 23:37 schrieb Clifford Heath:

On 8/8/19 4:34 pm, Jan Panteltje wrote:
All LNBs[1] I know use extremely fast extremely low noise NPNs.

Mostly low voltage NPNs,
for example google
   Infineon-BFP520-DS-v02_00-EN.pdf

45 GHz 1.2 dB noise

What's with the Abs Max ratings V(CEO) and V(CES) on that datasheet?
Is the Abs Max collector-emmitter voltage 2.4V or 10V?

Does that "O" mean Operating and the "S" mean Smoke?

Clifford Heath.

O means base is open and S means base is shorted to E.

 

[John Larkin]

On Mon, 2 Sep 2019 23:58:36 +0200, Gerhard Hoffmann <dk4xp@arcor.de>
wrote:

Am 02.09.19 um 23:51 schrieb Gerhard Hoffmann:

O means base is open  and  S means base is shorted to E.

Ingrid would like to add:

If you give the carriers in the base an opportunity to silently
go away, they won't engage in an avalanche revolution.
In a cascode stage, for example, you can get healthy output
voltages from that transistor.

regards, Gerhard

Operating a transistor with the base open isn't very useful anyhow.

Shorted isn't much better!


--

John Larkin Highland Technology, Inc trk

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[Clifford Heath]

On 3/9/19 7:51 am, Gerhard Hoffmann wrote:

Am 02.09.19 um 23:37 schrieb Clifford Heath:
On 8/8/19 4:34 pm, Jan Panteltje wrote:
All LNBs[1] I know use extremely fast extremely low noise NPNs.

Mostly low voltage NPNs,
for example google
   Infineon-BFP520-DS-v02_00-EN.pdf

45 GHz 1.2 dB noise

What's with the Abs Max ratings V(CEO) and V(CES) on that datasheet?
Is the Abs Max collector-emmitter voltage 2.4V or 10V?

Does that "O" mean Operating and the "S" mean Smoke?

Clifford Heath.

O means base is open  and  S means base is shorted to E.

Ahh, thanks. Presumably if the base is open then some leakage will start
to turn the device on and reduce the gap.

 

[Gerhard Hoffmann]

Am 03.09.19 um 01:17 schrieb John Larkin:

Operating a transistor with the base open isn't very useful anyhow.

Shorted isn't much better!


It's a measurement condition, not a use case.