Design_World_-_Internet_of_Things_Handbook_April_2020

INTERNET OF THINGS HANDBOOK

22 DESIGN WORLD — EE NETWORK 4 • 2020 eeworldonline.com | designworldonline.com

Reference Receiver CTLE attenuates

low-frequency signal components,

amplifi es components around the

Nyquist frequency, and fi lters out

higher frequencies. CTLE gain can

be adjusted to optimize the ratio of

low frequency attenuation to high

frequency amplifi cation. Visible here

are some of the CTLE fi ltering options.

Symbol Description Min Max Units Comments

UI Minimum unit interval 99.97 100.03 ps The minimum UI value corresponds to

the link baseline speed of 10.0 Gbps

with an uncertanity range of -300 ppm

to 300 ppm. See note 4.

AC_CM TX AC common mode voltage -- 100 mV pp

TJ Total jitter -- 0.38 UI pp See note 2 and note 3.

UJ Sum of uncorrelated DJ and RJ

components (all jitter components

except for DDJ)

-- 0.31 UI pp See note 2.

DDJ Data-dependent jitter -- 0.15 UI pp See note 5.

UDJ Deterministic jitter that is uncorrelated to

the transmitted data

-- 0.17 UI pp

UDJ_LF Low frequency uncorrelated

deterministic jitter

-- 0.04 UI pp See note 5.

DCD Even-odd jitter associated with

duty-cycle-distortion

-- 0.03 UI pp

YI TX eye inner height (one-sided voltage

opening of the di erential signal)

140 -- mV Measured for 1E6 UI. See note 1, note 2,

and fi gure 3-15.

Y2 TX outer height (one-sided voltage

opening of the di erential signal)

-- 650 mV Measured for 1E6 UI. See note 1, note 2.

and fi gure 3-15.

Short channel transmitter specifi cations. Here a short channel represents a device that plugs directly into the host

connector (such as a memory stick) with a host controller that is as close as possible to the host port connector.

Di erential return loss gives a

measure of the undesired interaction

and refl ection between the USB cable

and the host or receiving device.

0 2 4 6 8 10 12

-9

-8

-7

-6

-5

-4

-3

Freq. [Hz]

Mag [dB]

Di erential return loss test limits

10 10 10 10 10

-25

-20

-15

-10

-5

0

7 8 9 10 11

0dB

1dB

2dB

3dB

4dB

5dB

6dB

7dB

8dB

9dB

Freq. [Hz]

Mag [dB]

Reference receiver CTLE