Power Factor Corrected Power Supply; Forward Amplifier - Motorola BLE Series Installation And Operation Manual

2 2 2 2 - - - - 8 8 8 8 O v e r v i e w
The factory-installed 20-ampere fuse, illustrated in Figure 2-9, provides power-passing to
additional line extenders.

Power Factor Corrected Power Supply

The PFC power supply is offered as a configured option in the BLE*/*. The PFC design lowers
the current draw of the amplifier and improves power supply efficiency for the entire system.
Information provided in the previous subsection, Standard Power Supply, is applicable to the
PFC. R14 is the on-board 24 V adjustment which is set at the factory and should not require
correction in the field.
Figure 2-7 illustrates the components on the PFC power supply circuit board:
F i g u r e 2 - 7
B L E * / * P F C p o w e r s u p p l y
C1
F1
L1
Surge protector
or FTEC
F o r w a r d A m p l i f i e r
The operational gain of the 750 MHz silicon version is 29 dB with 15 dB of return loss. The
870 MHz silicon version achieves 30 dB operational gain with a return loss of 15 dB. All E-GaAs
BLE*/* amplifiers achieve 28 dB of gain with 16 dB of return loss. The operating gain includes
provisions for the insertion loss of the input cable equalizer and required reserve gain to operate
the Bode equalizer in the middle of its range. The low-noise figure, pre-amplifier stage, is a
conventional 750 MHz (BLE75*) or 870 MHz (BLE87*) hybrid followed by a power-doubled
output stage. Between the two stages is a JXP-*T pad socket, the Bode board, and the flatness
and equalizer board. Because these losses are located interstage, the noise figure is only
impacted by the insertion loss of the forward cable equalizer or a broadband cable simulator.
B L E * / * I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l
R14
C3
U4
D1
C14
C2
U3
L4
C16
L3
C11
C17
C25
C22
D2
R1
T2
D5
C19
T1
D4
C12
C10
R7
C23
Q2
Q3 Q1
U1
C8
U2
U5
C6
C9
90V
J1
60V
C28
D7
LO/HI
selector