ZLNB2012
The following diagram shows a typical block diagram
for a twin universal LNB design. The ZLNB2012 device
provides the two polarity and two tone switches
required to decode the two independent receiver
feeds. The device is also able to detect the absence of a
revceiver connection to either port of the LNB
providing all outputs to go high hence disabling of the
port. This allows the avoidance of unwanted signal
reflections from an unterminated down feed cable.
Additionally the front end bias requirements of the LNB
are provided by the ZNBG4000 or ZNBG6000 offering a
very efficient and cost effective solution
Horizontal
Gain Stage
GaAs/HEMTFET
Antenna
High Band
Control Input
<=13V-Horizontal
>=14.5V-Vertical
DC Input
13-25V
High Band
Horizontal
Low Band
Horizontal
H/V Output 1
+
Mixer
1
3
+
Low Band
Low Band
High Band
+
2
High Band
ASTRA
10.95 GHz-11.7 GHz
Standard Band
10.7 GHz-11.8 GHz
Enhanced Band
Bias Generator
ZNBG40XX
Series
ZLNB2012 Series
Dual H/V Switch
&
22kHz Switch
Control
PIN
Diode
MUX
IF down feed
950-1750 MHz
- Standard Band
950-2050 MHz
- Enhanced Band
High Band
Vertical
Low Band
Vertical
4
H/V Output 2
Mixer
Vertical
Antenna
Gain Stage
GaAs/HEMTFET
+
Low Band
PROVISIONAL ISSUE A - OCTOBER 2001
5
ZETEX [ ZETEX SEMICONDUCTORS ]
