hsms-282c-tr2 Avago Technologies, hsms-282c-tr2 Datasheet - Page 3

• Manufacturer Part Number: hsms-282c-tr2
• Description: Surface Mount Rf Schottky Barrier Diodes
• Manufacturer: Avago Technologies

Quad Capacitance
Capacitance of Schottky diode quads is measured using
an HP4271 LCR meter. This instrument effectively isolates
individual diode branches from the others, allowing
accurate capacitance measurement of each branch or
each diode. The conditions are: 20 mV R.M.S. voltage at 1
MHz. Avago defines this measurement as “CM”, and it is
equivalent to the capacitance of the diode by itself. The
equivalent diagonal and adjacent capacitances can then
be calculated by the formulas given below.
In a quad, the diagonal capacitance is the capacitance
between points A and B as shown in the figure below.
The diagonal capacitance is calculated using the follow‑
ing formula
Linear Equivalent Circuit, Diode Chip
R
C
R
where
I
I
T = temperature, °K
n = ideality factor (see table of SPICE parameters)
Note:
To effectively model the packaged HSMS-280x product,
please refer to Application Note AN1124.
3
b
s
C
S
j
j
= externally applied bias current in amps
= saturation current (see table of SPICE parameters)
=
DIAGONAL
= junction capacitance (see Table of SPICE parameters)
= series resistance (see Table of SPICE parameters)
8.33 X 10
R
I
S
b
= _______ + _______
+ I
s
C
C
-5
1
1
nT
+ C
x C
2
2
R
C
j
C
j
C
3
3
+ C
x C
4
4
SPICE Parameters
The equivalent adjacent capacitance is the capacitance
between points A and C in the figure below. This capaci‑
tance is calculated using the following formula
This information does not apply to cross‑over quad
diodes.
Parameter
B
C
E
I
I
N
R
P
P
M
C
BV
S
V
G
S
B
T
J0
ADJACENT
C
= C
Units
V
pF
eV
A
A
Ω
V
1
+ ____________
–– + –– + ––
C
C
C
1
2
1
2
HSMS-280x
75
1.6
0.69
E‑5
3.00E‑08
1.08
30
0.65
2
0.5
C
1
1
3
C
1
4
C
C
3
4
A
B