Peak values, e.g. I
鈥?/div>
Average values, e.g. I
b(av)
.
If more than one subscript is used, the subscript for which
both styles exist are either all upper-case or all lower-case.
A
DDITIONAL RULES FOR SUBSCRIPTS
Transistor currents
If it is necessary to indicate the terminal carrying the
current, this should be done by the first subscript
(conventional current flow from the external circuit into the
terminal is positive).
Examples: I
B
, i
B
, i
b
, I
bm
.
Transistor voltages
If it is necessary to indicate the points between which a
voltage is measured, this should be done by the first two
subscripts. The first subscript indicates the terminal at
which the voltage is measured and the second the
reference terminal or the circuit node. Where there is no
possibility of confusion, the second subscript may be
omitted.
Examples: V
BE
, v
BE
, v
be
, V
bem
.
Supply voltages or currents
Supply voltages or supply currents are indicated by
repeating the appropriate terminal subscript.
Examples: V
CC
, I
EE
.
If it is necessary to indicate a reference terminal, this
should be done by a third subscript.
Example: V
CCE
.
(RMS), (rms) root-mean-square value
S, s
X, x
Z, z
Subscripts for devices with more than one terminal of the
same kind
If a device has more than one terminal of the same kind,
the subscript is formed by the appropriate letter for the
terminal, followed by a number. In the case of multiple
subscripts, hyphens may be necessary to avoid confusion.
No additional subscript is used for DC values.
Upper-case subscripts are used for the indication of:
鈥?/div>
Continuous (DC) values (without signal), e.g. I
B
鈥?/div>
Instantaneous total values, e.g. i
B
1999 May 07
126
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