CH0603-250RJF Datasheet, PDF (5/11 Pages) Vishay Siliconix – High Frequency 50 GHz Thin Film Chip Resistor

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CH
Vishay Sfernice
The complex impedance of the chip resistor is given by the following equations:
Z
=
-----^R--------⁺-------^j-^-----^--^L-----^–-------^R----²---^C--------^–------^L----²---^C-----^----²---^-----
1 + CR²C – 2L² + L²C⁴
_---Z_----
R
=
--------------------------------------------¹---------------------------------------------
1 + CR²C – 2L² + L²C⁴
x
1+
_-----_--L_-----–_-------R_----²_---C_--------–_------L_----²_---C_-----_----²_---
R
2
Notes
• =2xxf
• f: Frequency

=
tan
–1
_-----_--L_-----–_-------R_----²_---C_--------–_------L_----²_---C_-----_----²_---
R
The chip resistor itself is purely resistive when R
which the resistor looks approximately resistive.
This can be seen on the graphs showing the ratio
R, L and C are relevant to the chip resistor itself.
=
_---Z_----
R
-^L-- . The smaller the
C
versus frequency.
L
x
C
product
the
greater
the
frequency
range
over
L_c and C_g also depends on the way the chip resistor is mounted.
It is important to notice that after assembly the external reactance of L_c and C_g will be combined to internal reactance of L and
C. This combination can upgrade or downgrade the HF behaviour of the component.
This is why we are displaying two sets of data:
•
_---Z_----
R
versus frequency curves which aims to show at a glance the intrinsic HF performance of a given chip resistor
• S-parameters versus frequency curves relevant to chip resistor when assembled on ideal Z0 impedance transmission line
These lines are terminated with adapted source and load impedance respectively Z_s and Z_l with Z₀ = Z_L = Z_s (for others
configurations please consult us).
Equivalent circuit for S-parameters:
Z total
C
Z_S
Z₀
Z₀
G
C_g
L_c
L_c
C_g
Z_L
L
R
S-parameters are computed taking into account all the resistive, inductive and capacitive elements (Z total) and Z₀ = Z_L = Z_s = R.
Revision: 28-Aug-13
5
Document Number: 53014
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