Leila vpsz

First of all, the first letter capital V comes from the standard's paragraphs 1.1.1 and 1.1.2, which define that v and V are quantity symbols describing voltage; in lower case it means instantaneous voltage (1.1.1) and in upper case it means maximum, average or RMS voltage (1.1.2). For your reference:

Paragraph 1.2 starts to define the subscripts for quantity symbols. Subscript letters in upper case mean DC values and lower case mean AC values. Supply voltages are obviously DC voltages, so their letters must be in upper case.

The standard defines 11 suffix (letter)s. These are:

This standard predates the MOS transistor (which was patented in August 1963) and thus doesn't have the letters for Source and Drain. It has since been superseded by a newer standard that defines the letters for Drain and Source, but I don't have that standard available.

The further nuances of the standard, that define further rules on how the symbols are written makes for fascinating reading. It's amazing how all this has become common knowledge that is now quietly accepted and understood even without a normative reference.

Paragraph 1.3 defines how subscripts are written, especially when there is more than one. Please read the words of the standard:

So for example VbE means the RMS value (capital V) of the AC component (lower case b) of the Voltage at the Base of a semiconductor device in reference to the DC value of the Voltage of the semiconductor device's Emitter (upper case E).

In case the said semiconductor's emitter is directly connected to ground, which is certainly understood to be a known reference, then the AC RMS voltage at the base is Vb. The DC or RMS voltage at the base is VB and an instantaneous voltage at the base is vb.

Now for the extra credit: Why VCC instead of VC or VDD instead of VD? I used to think that it's colloquial from "Voltage from Collector to Collector" but obviously it's no surprise that it's also defined in the standard:

So VCCB means the DC supply voltage at the semiconductor device's Collector in reference to the device's Base and VCC means the DC supply voltage at the Collector in reference to ground.

At first instinct it would seem that the reduplication of the subscript would lead to ambiguity, but in fact it doesn't. First of all, the cases that would seem ambiguous are quite rare; reading VCC to mean the voltage from a device's collector to the same device's collector is obsiously zero so there's no point describing it. But what happens if the device has two bases? The standard gives an answer. The voltage from base 1 of a device to base 2 of a device is written VB1-B2. And the voltage from base of device 1 to base of device 2 (pay attention here - this is interesting) is written V1B-2B.

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