Principle Of Rf Generation Pm 5390 - Philips PM 5390 Service Manual

3-8
Fig.
3
Principle of
RF
generation
PM
5390
Characteristics
of Indirect synthesis
Main
oscillator freq.
(VC01
)
fi
= 340
...
1020
MHz
Conversion
oscillator freq.
(VC02)
f2
= 290/460/630/800
MHz
Converted frequency fi
-f
2
=50... 220
MHz
Conversion
oscillator freq.
(VC03)
fs
= 510
MHz
Reference
oscillator
frequency
fosc
=
5
MHz
Reference frequency slow loop
1
fs
=
1
kHz
Reference frequency
fast
loop
1
fF
=
10
kHz
Reference frequency loop 2 and 3
fRef
= 39.0625 kHz
Divider
settings:
Ref. divider for
loop
1
A =
5000
Divider 5
B
=
128
Progr. divider for
fs
N
=
50.000
...
220.000
29x256
at
290
MHz
Progr. divider
2
n1
{
46
X
256
at
460
MHz
63x256
at
630
MHz
80x256
at
800
MHz
Ref. divider loop
3
n2
= 13056
The
locked
PLL
loop
1
and
2
is
represented by:
j
N
.
n1
j
f1
= fosc ("X
B
»
e.g.
frequency
RF
out
(f1)
= 1000
MHz
N = 200.000,
A
= 5000, B
=
128; n1
= 80
x
256