User's Manual Part 1

AT7400 Owner Manual Rev. 2.0 – October 2006-10-23 Section 3 - 15/39
3.6. Module 4464 – 20W UHF ATSC Power A mplifier
The RF/UHF signal, already set to the assigned channel, is than power amplified up to 20W. The RF amplifier is
type class AB. LDMOS transistors are also used on this amplification stage. Fig.:3.2; illustrates the RF chain of
the module 4464.
RF UHF
-2.3dBm
Printed Circuit Board CIM 3446
SG9289 BLF1822
BLF1822SG9289
G = 16dB
G = 32dB
Printed Circuit Board C IM 3440
H
H H
H
RF UHF
20W
RF UHF
0.5W
Module 4455: 20W power amplifier
BLF861A
BLF861A
BLF861A
BLF861A
Fig.3.8: UHF 48dB gain RF amplification chain, simplified block diagram
Fig.3.9: Module 20W UHF ATSC power amplifier – module 4464