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ZLNB1001
Typical application circuit using pin diodes
Input, low band vert
Input, low band horiz
IF out
Input, high band vert
R3
Input, high band horiz
C2
C3
C4
47pF typical
47pF typical
47pF typical
1k
typical
C11 47pF typical
R1
R2
47R
1k
1
2
U1
VIN
VPOL
VOUT4
VOUT3
8
7
C5
47pF typical
3
FIN
VOUT2
6
C1
4.7nF
4
GND
VOUT1
5
ZLNB1001
Application information
The schematic diagram above shows the typical application driving RF signal PIN diodes. Values
of suitable external components are shown. R1 R2 and C1 are required to achieve specified
operation. Values of other components are typical of the application. When one signal path is
selected according to the Truth Table, the selected signal diodes carry a forward current set by R3.
The other signal diodes are biased off, R3 providing a degree of reverse bias.
In order to limit the peak current in the device, it is recommended that the output decoupling
capacitor value, including C2, C3, C4 and C5, should not be excessive. Normally this total is
expected to be less than a few hundred pF in the intended application.
Issue 1 - September 2005
? Zetex Semiconductors plc 2005
3
www.zetex.com
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