參數(shù)資料
型號(hào)： TUA6100B6
廠商： INFINEON TECHNOLOGIES AG
英文描述： Components for Satellite Receiver Units
中文描述： 元件衛(wèi)星接收單元
文件頁數(shù)： 6/46頁
文件大?。?/td> 819K
代理商： TUA6100B6
High-Frequency-Products
1
26.1.01
DCR Sat-Frontend
Gain controlled I/Q Mixer
for digital QPSK Sat signals
TUA6100B6
Preliminary Specification
BICMOS
1
Features
Low impedance gain controlled RF input
Dual matched double balanced mixer
Digital generation of 0 /90 LO signal
Direct down conversion from 1. IF
(LNB output) to base band 0-30 MHz
IF filter not necessary
I / O for external baseband filter
CMOS PLL-Synthesizer
Active loop filter (high voltage)
3 high current switch outputs
Buffered crystal oscillator output
Low noise reference voltage
3-wire bus and
I
2
C bus with 4 addresses + subaddresses
Splitting of Sat tuning range into 2/3 bands
LO - frequency below and above
input frequency possible
Package
TSSOP-28
2
The TUA 6100 is a low cost chip in the newest Infineon high speed BICMOS technology B6HFC. It is designed
to implement the direct conversion receiver principle for digital QPSK-Sat receiving systems.
General Description
The DCR architecture eliminates the need for expensive RF-Filters for image rejection and IF-Frequencies for
channel selection. Instead, an inexpensive base band low-pass filter is used for channel selection, and no
image rejection filter is required.
These base band filter enable the possibility for an on chip integration. (not part of TUA6100)
The DCR system is the most promising architecture to lower the cost of digital set-top boxes front end.
Via a gain controlled RF preamplifier (not part of TUA6100) with approx. 30 dB gain and some selectivity, the
RF signal is symmetrical fed to two low input impedance double balanced mixers .
The mixers have common inputs with internal power splitting and incorporate a new patented direct gain
control in the mixer input stage and an additional gain control at the mixer output to improve S/N ratio.
The signal of the synthesizer tuning VCO is multiplied to 4 x RF input frequency via a complete internal
3.8-8.6 GHz PLL system.
To drive the mixers, this 3.8-8.6 GHz signal is split into quadrature components by a Johnson-counter
The mixers are followed by 2 matched 16 dB fixed gain base band amplifiers making available the first linear
DC-coupled base band outputs with approx. 224 mV
pp
for the I and Q signal .
Two additional 16 dB fixed gain base band amplifiers with approx. 1 V
pp
output voltage enable the possibility
to use system adapted external AC-coupled base band filter and eliminate undesirable DC-components of the
first amplifiers .
.
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