LTSPICE model for Ge transistors

P

petrus bitbyter

Guest
Looking for models of Ge transistors I only found some that behaved like Si
ones having a Vbe of 0.7V. Anyone can tell to find good ones?

petrus bitbyter
 
In article <XnsA3D27D1AC546Cpetrusbitbytersid@194.109.133.133>,
petrus.bitbyter@hotmail.com says...
Looking for models of Ge transistors I only found some that behaved like Si
ones having a Vbe of 0.7V. Anyone can tell to find good ones?

petrus bitbyter
Click to expand...

Are you looking for Germanium or General Electric ? You
didn't specify a part number..

Jamie
 
Not offhand; if nothing else it should be pretty close to set EJ=0.3 or
so, and TT will be much larger.

Tim

--
Seven Transistor Labs
Electrical Engineering Consultation
Website: http://seventransistorlabs.com

"petrus bitbyter" <petrus.bitbyter@hotmail.com> wrote in message
news:XnsA3D27D1AC546Cpetrusbitbytersid@194.109.133.133...
Looking for models of Ge transistors I only found some that behaved like
Si
ones having a Vbe of 0.7V. Anyone can tell to find good ones?

petrus bitbyter
Click to expand...
 
On 26 Oct 2014 11:17:53 GMT, petrus bitbyter
<petrus.bitbyter@hotmail.com> wrote:

Looking for models of Ge transistors I only found some that behaved like Si
ones having a Vbe of 0.7V. Anyone can tell to find good ones?

petrus bitbyter
Click to expand...

You'll probably need to roll your own from a datasheet and
measurements. Start with EG=0.67, then twiddle IS, BF and IKF.
Capacitances from the datasheet.

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
On 26 Oct 2014 11:17:53 GMT, petrus bitbyter
<petrus.bitbyter@hotmail.com> wrote:

Looking for models of Ge transistors I only found some that behaved like Si
ones having a Vbe of 0.7V. Anyone can tell to find good ones?

petrus bitbyter
Click to expand...

I stumbled across this...

<http://www.analogservices.com/excel.htm>

My son Aaron and I wrote a similar program in Pascal ~1980 (I did the
math, he wrote the code >:-}, back when all we had was Berkeley Spice
Original Crunchy, on a VAX, with models that sucked.

I haven't tested this at all. Please report back success or failure.

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
On 26 Oct 2014 11:17:53 GMT, petrus bitbyter
<petrus.bitbyter@hotmail.com> wrote:

Looking for models of Ge transistors I only found some that behaved like Si
ones having a Vbe of 0.7V. Anyone can tell to find good ones?

petrus bitbyter
Click to expand...

Here's one that has the right EG:

..model 2N344 PNP(Is=1e-10 bf=11 Vaf=15 Cje=5p Cjc=2.5p Tf=3n
+ Eg=.67 Rb=100 Re=10)

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote
in news:f6705a5vsckj5sp3hh28dfh1i11hllhjfr@4ax.com:

On 26 Oct 2014 11:17:53 GMT, petrus bitbyter
petrus.bitbyter@hotmail.com> wrote:

Looking for models of Ge transistors I only found some that behaved
like Si ones having a Vbe of 0.7V. Anyone can tell to find good ones?

petrus bitbyter

Here's one that has the right EG:

.model 2N344 PNP(Is=1e-10 bf=11 Vaf=15 Cje=5p Cjc=2.5p Tf=3n
+ Eg=.67 Rb=100 Re=10)

...Jim Thompson
Click to expand...

Thanks. This helps. Sent another post already that seems to be vanished.

petrus bitbyter
 
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