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Inventory #2

A project log for Germanium ECL

How fast can germanium transistors compute ? And how much current will that draw ?

Yann Guidon / YGDESYann Guidon / YGDES 10/31/2016 at 15:180 Comments

(updated 20161230)
(updated 20170106)
(updated 20170326)
supersedes log 1. Inventory?

So I got the 4-channels 200MHz DDS, the 4×300MHz scope, as well as a 2×200MHz DSO, and a new supply of AF240S.

RefhFE
Ft
(MHz)
I
(mA)
U
(V)
P
(mW)
FabQty
G106T6035
2560Telefunken300
AF137
6035
2560Telefunken300
AF13860...10040
2560Telefunken1000
AF178>20180102575Philips100
AF200>302001025225
(??)
Siemens600
AF24025500101560Siemens10000
AF439>104001015
Philips540?

I can now choose between 3 classes of Ge transistors :

The slow transistors can be used for I/O ports. For example keyboard input, LED drivers, GPIO, serial I/O... Probably using saturated logic as well, whereas the AF240 will use ECL.

I wonder if I can make 25MHz synchronous counters. That would enable me to work with a VGA display, reusing some tricks implemented by @Ted Yapo for #PIC Graphics Demo.

No idea about how to implement some memory, though. I don't want to suffer the magnetic/core memory hell... I will certainly cheat and use modern CMOS ASRAM :-)

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