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STW81103 데이터시트(PDF) 20 Page - STMicroelectronics

부품명 STW81103
상세설명  Multi-band RF frequency synthesizer with integrated VCOs
PDF  53 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STW81103 데이터시트(HTML) 20 Page - STMicroelectronics

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Circuit description
STW81103
20/53
5.4
A and B counters
The 5-bit A-counter and 12-bit B-counter, in conjunction with the selected dual modulus
(16/17 or 19/20) prescaler, allow the generation of output frequencies that are spaced only
by the reference frequency divided by the reference division ratio. The division ratio and the
VCO output frequency are given by the following formulas:
N = B x P + A
where
FVCO: output frequency of VCO
P: modulus of dual modulus prescaler (16 or 19 selected through the digital interface)
B: division ratio of the main counter
A: division ratio of the swallow counter
Fref: input reference frequency
R: division ratio of the reference counter
N: division ratio of the PLL
For the VCO divider to work correctly, B absolutely must be greater than A, which can take
any value ranging from 0 to 31. The value range of N is either from 256 to 65551 (if P=16) or
from 361 to 77836 (P=19).
Figure 16.
VCO divider diagram
F
VCO
BP
A
+
×
()
R
------------------------------
F
ref
×
=
5-bit
12-bit
To PFD
modulus
VCOBUF+
VCOBUF-
Prescaler
16/17 or 19/20
B-counter
A-counter



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