Datasheet

Measuring Method of Inductance/Q
1. Residual elements and stray elements of test fixture
can be described by F-parameter as shown in the
following:
2. The impedance of chip inductor (chip coil) Zx and
measured value Zm can be described by input/output
current/voltage.
3. Thus, the relation between Zx and Zm is shown in the
following:
4. Lx and Qx should be calculated with the following
equation.
● Measuring Method
V1 A
=
B
I
1 CD
V
2
I2
AB
CD
Zm
Zx
V
1
V2
I1 I2
ProductTest fixtureTest Head
V1
I1 ,
Zm =
V2
I2
Zx =
Zm - β
1 - ZmΓ
Zx = α
where, α = D / A = 1
β = B / D = Zsm - (1 - Yom Zsm) Zss
Γ = C / A = Yom
Zsm: measured impedance of short chip
Zss: residual impedance of short chip*
Yom: measured admittance when opening the fixture
0nH LQG15HS
0.110nH LQP02T
0.464nH LQW04A
0.480nH LQP03T_02
0.556nH LQG15HN, LQW15A, LQP15T/M
0.771nH LQG18H, LQP18M, LQW18A, LQW21H
Residual
Impedance
Series
*Residual impedance of short chip
Lx: Inductance of chip inductor (chip coil)
Qx: Q of chip inductor (chip coil)
f: Measuring frequency
,
Im (Zx)
2πf
Lx =
Im (Zx)
Re (Zx)
Qx =
RF Inductor !Caution/Notice
166
Inductor for Low Frequency CircuitsRF Inductor
!Caution/ Notice
Inductor for Power Lines (Power Inductor)
!Note
• Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please review our product specifications or consult the approval sheet for product specifications before ordering.
O05E.pdf
Oct.13,2011