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PDF K6257K Data sheet ( Hoja de datos )
| Número de pieza | K6257K | |
| Descripción | SAW filter | |
| Fabricantes | S+M | |
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Hay una vista previa y un enlace de descarga de K6257K (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Switchable SAW Filter K6257K
Application Notes
Author:
Fröhlich
Updated:
26.08.98
Department: OFW E UE
Abstract:
K6257K is designed for quasi-split-sound, multistandard applications. A BG channel
with reduced group delay predistortion and a double nyquist path with flat group
delay are selectable. In this application note, a switching circuit with a test layout is
proposed and the results are evaluated.
Application note SAW K6257K
-1-
1 page  
OFW E UE
SAW filters in- and output. Within the passband the select circuit is of no influence
on the intermodulation performance. A choke of 0.68uH may be a compromise (ratio
worsens by 4dB ) for both modes when the additional capacitor of 6.8pF is not
accepted.
The testsetup for intermodulation is shown below:
The switching diodes do not create additional intermodulation products, even with
the high input level of -2dBm at the testpcb input (+13dBm at TUA 2007 output).
Usually, in a TV set within the AGC range an IF signal of 25mV at the SAW drivers
input (about 300mV at SAW input) can be stated. Then, intermodulation is far belo
-60dB and out of consideration.
CENELEC test
The response of SAW filter OFW K6257K provides good sidelobes and a standard
picture carrier attenuation. The traps attenuations now are well beyond a critical
value for the CENELEC-approval.
Concerning the SAW filter, the test S1 - the ANTENNA INPUT RESISTANCE test -
for the N+1 and for the N-1 channels might be tough, if the traps will not reach lower
than -40dB.
Furthermore the sidelobes attenuation is of some importance when the test S3 - the
RADIATION RESISTANCE test - is conducted.
The strong interference carrier employed in that test, running between 10kHz and
150MHz, will be picked up easily and then it might be visible as an ugly pattern on
the screen.
A 16dB insertion loss of SAW filter OFW K6257K was measured in a SAW tester.
The level of a balun/wideband transformer inserted into the tester first was set to
0dB as a reference.
Application note SAW K6257K
-5-
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet K6257K.PDF ] | |
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