Circuit measures microvolts in the presence of volts

Because one ought not to rely on a warm transistor to pass no more than a few nanoamperes, Q4 and Q5 with R20 form a series-shunt power switch. Because Q4's off-current is very small, it only drops a tiny voltage across R20. Q5 then passes very little current, due to the fact that it has little...

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Veröffentlicht in:	Electronic Design 2004-08, Vol.52 (18), p.78-80
1. Verfasser:	Morong, William H
Format:	Magazinearticle
Sprache:	eng
Schlagworte:	Circuit design Design and construction Measuring instruments
Online-Zugang:	Volltext
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