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STW82102B Scheda tecnica(PDF) 25 Page - STMicroelectronics

Il numero della parte STW82102B
Spiegazioni elettronici  RF down converter with embedded integer-N synthesizer
PDF  67 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW82102B Scheda tecnica(HTML) 25 Page - STMicroelectronics

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STW82102B
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Doc ID 018516 Rev 2
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Figure 10.
VCO divider diagram
8.1.5
Phase frequency detector (PFD)
The PFD takes inputs from the reference and the VCO dividers and produces an output
proportional to the phase error. The PFD includes a delay gate that controls the width of the
anti-backlash pulse. This pulse ensures that there is no dead zone in the PFD transfer
function.
Figure 11 is a simplified schematic of the PFD.
Figure 11.
PFD diagram
modulus
Prescaler
16/17 or 19/20
5-bit
A counter
12-bit
B counter
VCOBUF-
VCOBUF+
To PFD
VDD
Fref_DIV
FVCO_div
VDD
D
Delay
ABL
Down
Up
R
R
Q
D
Q



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