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Clock and Data Recovery for Serial
Digital Communication
(plus a tutorial on bang-bang Phase-Locked-Loops )
Rick Walker
Hewlett-Packard Company
Palo Alto, California
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Agenda
Overview of serial data communications
Degradation mechanisms, data coding
Clock recovery methods and components
Jitter measurements
B
r
e
a
k
BB PLL Theory
Simulation techniques
1st, 2nd order loops
Key design parameters
2
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Diversity of CDR applications
s
Clock and Data Recovery (CDR) applications span the
range from ultra-high-volume, low cost datacom
applications to very high precision, long-haul telecom
applications
Many different trade-offs tailor each circuit to the target
application area
1.25Gb/s Gigabit
Ethernet Transceiver
<$6 in volume
(datacom application)
2.488Gb/s SONET
CDR ~$400 (telecom
application)
1cm
3
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Serial data transmission sends binary bits of
information as a series of optical orelectrical pulses:
0111011000111110011010010000101011101100011111..
Thetransmissionchannel(coax,radio,fiber)generally
distorts the signal in various ways:
From this signal we must recover both clock and data
Basic Idea
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Bit Error Rate (BER) Testing
ng
Pseudo-Random-Bit-Sequence (PRBS) is used to
simulate random data for transmission across the link
PRBS pattern 2
N
-1 Bits long contains
a
l
l
N-bit patterns
Number of errored-bits divided by total bits = BER.
Typical links are designed for BERs better than 10
-12
PRBS
data
generator
TX
RX
synth
link
PRBS
data
receiver
clock in
clock in
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Eye diagram construction
random
data
TX
RX
synth
trigger
link
scope
X
X
Y
Y
symbol cell (UI)
amplitude
distribution at Y-Y
jitter
Use a precise clock to chop the data
overlay each period onto one plot
into equal periods
6
Some Signal Degradation Mechanisms
Multiplex Jitter
AC Coupling
Optical Pulse Dispersion
Skin Loss
Random Noise
E+O Crosstalk
Intersymbol Interference
7
Multiplex Jitter
high speed data
bit stuffing events
sub-rate data
phaseerror
[in UI]
time
Multiplex jitter is not a problem on the high rate channel
itself - it only occurs on non-synchronous, lower speed
tributaries that have been sent over the high-speed
channel (e.g.: DS3 over SONET OC-48).
8
Time/VoltageaberrationsfromAC-coupling
V
V
t
t=0
t=t
1
Percent AC coupled droop is
.
Jitter is introduced by finite slope of pulse rise/fall time:
P
V V
t
V
----------------
100
·
t
1
RC
--------
100
·
»
Dt
t
r
t
1
(2RC
)
----------------
=
Dt
9
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