July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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For example, let P = 50 so P + 1 = 51, let N = 10 and A = 7. Then:
N
t
= 10 × 50 + 7 = 507
Now, change A to 6:
N
t
= 10 × 50 + 6 = 506
a change of N
t
by 1.
Programming a divider
Example:
VCO frequency = 455.6MHz
Reference frequency = 12.5kHz
Calculate N
t
, and the numbers which must be programmed into the A
and N counters, assuming P = 50:
1. Calculate N
t
= 455.6MHz/12.5kHz= 36 448.
2. Divide N
t
by P : 36 488/50 = 728.96. Make N = 728.
3. For A, multiply fraction by P :0.96 × 50 = 48.
4. Check N
t
= NP + A = 728 × 50 + 48 = 36 448.
Change A to 47: NP + A = 728 × 50 + 47 = 36 447.
36 447×12.5kHz = 455.5875 MHz, the adjacent 12.5 kHz channel.
6.4.4 Direct digital synthesis
A method of direct digital frequency synthesis replaces the voltage-
controlled oscillator by
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