TDA5255XT Infineon Technologies, TDA5255XT Datasheet - Page 39
TDA5255XT
Manufacturer Part Number
TDA5255XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.TDA5255XT.pdf
(91 pages)
Specifications of TDA5255XT
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Product Depth (mm)
4.4mm
Product Length (mm)
9.7mm
Operating Supply Voltage (min)
2.1V
Operating Supply Voltage (max)
5.5V
Lead Free Status / Rohs Status
Compliant
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Measured Magnitude of S11 of evalboard:
Figure 3-3
Above you can see the measured S11 of the evalboard. The –3dB-points are at 404MHz and
468MHz. So the 3dB-bandwidth is:
The loaded Q of the resonant circuit is:
The unloaded Q of the resonant circuit is equal to the Q of the inductor due to its losses.
An approximation of the losses of the input matching network can be made with the formula:
Data Sheet
L
OSS
=
B
−
Q
20
=
Q
U
*
f
L
U
log
=
=
Q
−
S11 measured
1
INDUCTOR
f
f
−
center
L
B
Q
Q
=
U
L
468
=
=
≈
−
MHz
434
20
32
64
*
2 ,
log
MHz
@
−
MHz
404
434
1
−
MHz
6
32
MHz
=
8 ,
6
8 ,
=
=
2
dB
64
MHz
39
[3 – 4]
[3 – 1]
[3 – 3]
[3 – 2]
TDA5255 E1
S11_measured_434.pcx.
Version 1.2
Application
2007-02-26
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