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155-0076-00: Difference between revisions
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|Part_nos=155-0076-00 | |Part_nos=155-0076-00 | ||
|Description=input protection and probe logic | |Description=input protection and probe logic | ||
|an=an | |||
|Used_in=485;7A29;7A29P;11A52;11A71;11A72;SCD1000 | |Used_in=485;7A29;7A29P;11A52;11A71;11A72;SCD1000 | ||
|Designers=John Addis;Wink Gross | |Designers=John Addis;Wink Gross | ||
}} in a 16-pin [[minipac]] package, designed by [[John Addis]] in 1971. | }} in a 16-pin [[minipac]] package, designed by [[John Addis]] in 1971. | ||
The M94 has four subcircuits: | The M94 has four subcircuits: | ||
* DC current sources for biasing | * DC current sources for biasing | ||
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* Output logic and drivers for coil of relay that sets input impedance of scope | * Output logic and drivers for coil of relay that sets input impedance of scope | ||
The M94 uses an IC fabrication process with NPN and PNP transistors. | The M94 uses an IC fabrication process with NPN and PNP transistors. The NPN devices in this fabrication process have good performance and a beta around 100. | ||
The NPN devices in this fabrication process have | |||
good performance and a beta around 100. | |||
In contrast, the PNP transistors are poor-performing lateral devices with beta around 8. | In contrast, the PNP transistors are poor-performing lateral devices with beta around 8. | ||