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TA0321 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - TECHNICAL ARTICLE - ST Microelectronics

भाग संख्या TA0321
समारोह TECHNICAL ARTICLE
मैन्युफैक्चरर्स ST Microelectronics 
लोगो ST Microelectronics लोगो 
पूर्व दर्शन
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TA0321 pdf
1 What is a Low Noise Block (LNB)?
1 What is a Low Noise Block (LNB)?
TA0321
An LNB is a low noise block module, placed on the focus of the satellite dish antenna (parabola)
that provides the following functions:
Down conversion of the incoming signal from GHz range to the 910 MHz - 2150 MHz (for
Europe) range called “first conversion signal”. This conversion allows the signal to be
carried by an inexpensive coaxial cable towards the receiver.
Signal amplification with good noise figure. The LNB improves the first conversion signal
level through the use of a built-in low noise amplifier.
Selection of Vertical or Horizontal polarization.
Selects operating band by switching its internal oscillator from Low band to High band
when the LNB “receives” a 22kHz tone. Specifically, the local oscillator (LO) frequency
changes from 9.75 GHz to 10.6 GHz.
– C Band - LO frequency 9.75 GHz
– Ku Band - LO frequency 10.6 GHz
Miscellaneous functions based on 22kHz tone PPM encoding, as discussed later in this
paper.
Figure 1. OMNI-LNB architecture
RF Input
Antenna
feed
system
Power supply
and
control
Waveguide
transition
and
Depolarizer
X
Y
H
LNA and RHCP
Polaraization LHCP
matrix
V
Polarization
switch
LNB
Back-end
IF Output
2/12

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भाग संख्याविवरणविनिर्माण
TA0321TECHNICAL ARTICLEST Microelectronics
ST Microelectronics


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