TUA6039 Infineon Technologies Corporation, TUA6039 Datasheet - Page 12

• Manufacturer Part Number: TUA6039
• Description: Stationary - Mopll & Silicon Tuner
• Manufacturer: Infineon Technologies Corporation

4. Alignment
4.1 Alignment Setup
performance of DVB-T Half NIM. IF center frequency of 36MHz will be used for the overall alignment,
and 3 points of IF frequencies, 32, 36 & 40MHz should be monitored to align in-channel
characteristics. Instead of a Polyscope we can use any type of network analyzer which has a
conversion loss measurement function. With such a general-purpose network analyzer the system
bandwidth and sampling points of the instrument should be adjusted for best resolution.
The sweep generator is connected via a return loss bridge to the antenna input of the tuner. Because
of the balanced SAW driver output the 75 Ω detector has to be connected via a dummy BALUN
simulating the SAW filter input impedance to the tuner output.
This dummy BALUN is also used for the measurements in the test set-up.
12 pF
This is an example of analog tuner alignment setup. The same setup can be used to align RF
to 75 Ohm detector
to IF pins of tuner
VSWR Bridge
RF Out
DUT
10 turns
2 turns
Rhode & Schwarz polyscope
Sweep generator:
Application Notes Revision 3.0
IF Out
For digital Half NIM alignment only IF center frequency of 36 MHz can be used
all through the alignment and measurement. The tuner is designed to cover IF
bandwidth of 8MHz between 32MHz ~ 40MHz.
The tuning voltage of each band should not fall below 0.7 V for lowest
frequency and 25.5 V for highest frequency.
Lin. Amplifier Input
Activ Detector
Fig. 7 Half NIM Alignment Setup
Log. Amplifier Input
Application Engineering
Detector
11
SCL SDA
U
AGC
U
TUN
Communication Solutions
IFAP COM Tuner Systems
U
B
marker generator
power supply
May 2007
V
Control
Software
PC SC
IIC
A