APN1005 Ver la hoja de datos (PDF) - Skyworks Solutions
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APN1005 Datasheet PDF : 11 Pages
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APPLICATION NOTE • APN1005
Parameter
IS
RS
N
TT
CJO
VJ
M
EG
XTI
KF
AF
FC
BV
IBV
ISR
NR
IKF
NBV
IBVL
NBVL
TNOM
FFE
Description
Saturation current (with N, determine the DC characteristics of the diode)
Series resistance
Emission coefficient (with IS, determines the DC characteristics of the diode)
Transit time
Zero-bias junction capacitance (with VJ and M, defines nonlinear junction capacitance of the diode)
Junction potential (with VJ and M, defines nonlinear junction capacitance of the diode)
Grading coefficient (with VJ and M, defines nonlinear junction capacitance of the diode)
Energy gap (with XTI, helps define the dependence of IS on temperature)
Saturation current temperature exponent (with EG, helps define the dependence of IS on temperature)
Flicker noise coefficient
Flicker noise exponent
Forward-bias depletion capacitance coefficient
Reverse breakdown voltage
Current at reverse breakdown voltage
Recombination current parameter
Emission coefficient for ISR
High injection knee current
Reverse breakdown ideality factor
Low-level reverse breakdown knee current
Low-level reverse breakdown ideality factor
Nominal ambient temperature at which these model parameters were derived
Flicker noise frequency exponent
Table 1. Silicon Varactor Diode Default Values
Unit Default
A
1e-14
Ω
0
-
1
S
0
F
0
V
1
-
0.5
EV
1.11
-
3
-
0
-
1
-
0.5
V
Infinity
A
1e-3
A
0
-
2
A
Infinity
-
1
A
0
-
1
°C
27
1
Table 1 describes the model parameters. It shows default values
appropriate for silicon varactor diodes which may be used by the
Libra IV simulator.
According to the SPICE model in Figure 4, the varactor capaci-
tance (CV) is a function of the applied reverse DC voltage (VR) and
may be expressed as follows:
CV =
CJO
+ CP
( 1 + VR
M
)
VJ
This equation is a mathematical expression of the capacitance
characteristic. The model is accurate for abrupt junction varactors
(SMV1400 series); however, the model is less accurate for hyper-
abrupt junction varactors because the coefficients are dependent
on the applied voltage. To make the equation fit the hyperabrupt
performances for the SMV1265-011, a piece-wise approach was
employed. Here the coefficients (VJ, M, CJO, and CP) are made
piece-wise functions of the varactor DC voltage applied. Thus, the
whole range of the usable varactor voltages is segmented into a
number of subranges each with a unique set of the VJ, M, CJO,
and CP parameters as given in the Table 2.
Voltage Range
(V)
0–2.5
2.5–6.5
6.5–11
11–up
CJO
VJ
CP
(pF)
M
(V)
(pF)
22.5
2.0
4.00
0.00
21.0
25.0 68.00
0.00
20.0
7.3
14.00
0.90
20.0
1.8
1.85
0.56
Table 2. Varactor Voltages
These subranges are made to overlap each other. Thus, if a rea-
sonable RF swing (one that is appropriate in a practical VCO
case) exceeds limits of the subrange, the CV function described
by the current subrange will still fit in the original curve.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200314 Rev. A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 21, 2005
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