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eka_subyantara
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Indonesia - Member - New Member

Join Date: May 2006
Location: Corenda, Situmekar, Cisitu, Sumedang, West Java, Indonesia, Asia, Earth, Solar System, Milky Way, Universe.
Posts: 38
Good Answers: 1

Voltage labeling convention

09/03/2007 11:22 AM

Thank God to let me curious about 'the heart' of everything usual

We know from the convention of transistor theory that VBE denotes steady state voltage across basis-emitter and similar for VCE.

My curiosity arise for the origin of VDD, VSS, VCC, VEE labeling. Got informed that DD denotes for Drain, SS for source, CC for collector, and EE for emitter.

If so, why are they being double letter? and why VCC is always related to positive voltage polarity?

More over, VDD usually be paired with VSS as drain paired with source. Which one should be the 'bride' for VCC? Is it VEE, 0V, or GND? Why?

Share your knowledge, lets uncover the buried origin!

Curiosity kill the problem, not me :)

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PLM NY
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Join Date: Aug 2007
Location: New York
Posts: 25
#1

Re: Voltage labeling convention

09/04/2007 8:12 AM

Vcc is for a supply that is connected to the collector of a bipolar device. Technically, if the other supply (or return line) is connected to the emotter of the transistors you would either call it Vee or GND. It is very common in to have +/-Vcc in devices that have the collectors of transistors connected to both the + and - sides of the supply; dual supply op amps for example. I have often seen the conventions used incorrectly. I try to label my designes sensibly and just work through with what it get on data sheets that other provide. The real confusion comes into play with BiCMOS devices or trying to determine the technologies from the convemtions used.
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