IEEE Solid-States Circuits Magazine - Winter 2022 - 11

× 10-15
Figure 12 and slightly improves the
eye opening.
In the last step of our design,
1.2
1.4
0.2
0.4
0.6
0.8
1
106
107
108
109
Frequency (Hz)
FIGURE 8: The noise spectrum observed at the DFE summing junction.
1010
1011
we ponder higher-order taps. Our
impulse response analysis has yielded
%
h
%.
2 3=- and h3 6=- Neglecting the
former, we add two more FFs to the DFE
and apply the third tap with positive
feedback (Figure 13). The resulting
eye diagram is shown in Figure 14,
exhibiting vertical and horizontal
eye openings equal to 500 mV and
15.2 ps, respectively. Checked against
the original data, the first FF output
indicates correct operation.
The DFE draws about 4.5 mW, meeting
our overall equalizer power budget of
10 mW. It is possible to add components
such as inductive peaking, a
gain stage between the summer and
FF1
[6], or a 0.5-unit-interval feedVDD
RD
A
B
From
CTLE
M1
M2
CK CK CK CK
ISS1
W1,2 = 10 µm
W3,4 = 2.5 µm
L = 30 nm
RD = 500 Ω
1 mA
M3 M4
ISS2
250 µA
Corrections to Previous Articles
In [12], (9) should read:
NC CL Ms
CL CM CM s
=++
-+ (4)
EB()
22
() ,
BB E
22 4
2
and (10) should be revised to
2
BE
22
BE L
2
FIGURE 9: The DFE design.
1
DCCL Ms CC RL Ms
CL CM CLsR Cs
=- ++
++ ++ +
BB EL E
2243
1
() ()
() .
(5)
RD
L1
L2
back tap. For this particular equalizer
design and channel response,
these techniques do not significantly
improve the eye opening. However, for
other channels and/or with all of the
layout parasitics included, these concepts
and other DFE architectures can
be considered.
0.1
0.2
0.3
0.4
0.5
0.1
0.2
0.3
0.4
0.5
-0.5
-0.4
-0.3
-0.2
-0.1
05 10 15 20 25 30 35
Time (ps)
(a)
-0.5
-0.4
-0.3
-0.2
-0.1
05 10 15 20 25 30 35
Time (ps)
(b)
FIGURE 10: The output eyes at the (a) CTLE output and (b) DFE summing junction.
FIGURE 11: The summer input stage with
degeneration.
IEEE SOLID-STATE CIRCUITS MAGAZINE WINTER 2022
11
From
CTLE
0.5 mA
VDD
RD
M1 M2
100 Ω
200 fF
0.5 mA
RD
To
FF1
VCTLE (V)
Noise Spectrum (V2/Hz)
Vsum (V)

IEEE Solid-States Circuits Magazine - Winter 2022

Table of Contents for the Digital Edition of IEEE Solid-States Circuits Magazine - Winter 2022

Contents
IEEE Solid-States Circuits Magazine - Winter 2022 - Cover1
IEEE Solid-States Circuits Magazine - Winter 2022 - Cover2
IEEE Solid-States Circuits Magazine - Winter 2022 - Contents
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IEEE Solid-States Circuits Magazine - Winter 2022 - Cover3
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