cx28348 Mindspeed Technologies, cx28348 Datasheet - Page 178

• Manufacturer Part Number: cx28348
• Description: Dual/triple/quad/hex/octal-enhanced Ds3/e3 Framer
• Manufacturer: Mindspeed Technologies

Dejitter Circuit Analysis
Figure A-2. Dejitter Control Loop
A-2
The error signal is the sum of the input signal
divided by 16 and the VCO output divided by
16.
The output signal is the error signal times the
gain of the system
Rearranging equation 1 for
The ratio of the output to input signal yields
equation 4.
Simplifying this to the closed loop equation for
this system.
in
The dejitter control loop is represented as follows, where
LINECK signal and
1/16
in
+
Mindspeed Technologies™
-
E(s)
out
is the output from the VCO (RXCKI).
out
in
in
E
out
in
(
s
16
)
16
out
E
16
16
(
E
G(s)
H(s)
s
1
in
(
)
E
E
s
(
)
(
G
s
G
16
s
)
)
(
G
(
G
E
out
s
s
)
(
(
)
(
s
out
H
s
H
s
)
)
)
G
H
(
(
s
s
(
)
(
)
s
s
in
)
)
is the incoming
CX28342/3/4/6/8 Data Sheet
Eq. 1
Eq. 2
Eq. 3
Eq. 4
Eq. 5
28348-DSH-001-B
out