Tektronix Linear Equalizer

LE160 LE320 Linear Equalizer Datasheet
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32 Gbps 2 Channel Linear Equalizer (LE320)

Key performance specifications
  • Supports signal equalization on data rates from 8 Gbps to 32 Gbps
  • 20 dB automatic or manual gain Control
  • Integrated variable gain amplifier with differential 50 mV sensitivity
Key features
  • Clock-less design transfers incident signal impairments to outputs; no clock to data alignment concerns
  • 9 user adjustable fixed width taps spaced 18 ps apart on the LE320 and 24 ps apart on the LE160
  • Fixed tap delay design eliminates external reference clock requirements
  • USB programmable receiver gain and multi UI equalization allows 20 dB of equalization
  • USB programmable channel modeling allows electronic channel emulation
  • USB programmable pre-emphasis and differential outputs amplitude well in excess of 2 V differential
  • USB programmable output duty cycle symmetry control
  • Precision output level controls permit signaling from “0” (Return to Zero) well in excess of 2 V differentially
  • User defined presets and stored configurations tailored for key technologies
Applications
  • OIF-CEI-28G
  • 100G-KR4, -CR4
  • InfiniBand QDR, FDR, EDR
  • FC16, FC32

Receiver testing at all signal speeds

Receiver testing at signaling speeds above 8 Gbps requires precise attention to signal conditioning and equalization. Multi-Tap pre-emphasis is a common requirement where a pre-cursor, main-cursor and post-cursor controls are called out by receiver specifications. The LE320 and LE160 offer flexible controls permitting the user to tune these levels of pre-emphasis as needed for 100 G standards.

Multi-generational speeds require characterizing receivers against a wide array of physical channel loss profiles, which typically involves stocking up an array of backplanes or specialized reference channels. The flexible 9-tap filter configuration of the LE320 and LE160 can be structured to model a full passive frequency dependent loss profile. These profiles (loss or gain) can be stored and recalled electronically to facilitate silicon test under a broad set of conditions without the overhead of having many physical reference channels to test against.

The dynamic range of these linear equalizer output allows a user to apply precision output controls to regulate the amplitude from 2.7 V (differential peak to peak) to 0 V with a special output (Return to zero) mode of operation permitting continuous or burst mode tri-state signaling found in various power and state management applications such as LFPS or OOB measurements. These structured return to zero operations are key to power management state and link state training capabilities.

Jitter addition

Random jitter addition of the LE320/LE160 is below key limits allowed by various 100G standards. Offering high precision levels of RMS Random jitter ( <300 fsRMS) permits usage in demanding 100G receiver testing programs.


LE160-LE320-Linear-Equalizer-Datasheet


This data set shows that RMS RJ as measured on a PRBS-7 pattern is within typical 100 G operating limits (taken with a Tektronix DSA8300 with 50 GHz 80E09 sampling heads, with a 80A04 60 GHz Phase reference module).

  • RJ RMS < 300 fs under optimized conditions1
  • DDJ ptp < 6 ps under optimized conditions1
  • Rise/Fall time 15 ps (typical)

1Additive Jitter. The LE320/LE160 can be configured to many conditions resulting in increased Data Dependent Jitter (DDJ) and Random Jitter (Rj), for example in a backplane emulation configuration. The LE320 can be tuned to have < 300 fs RJ RMS and < 6 ps of DDJ.

Operational examples

The following illustrations show operational examples:


LE160-LE320-Linear-Equalizer-Datasheet


10 Gbps 40G-KR4


LE160-LE320-Linear-Equalizer-Datasheet


25.8 Gbps 100G-KR4

Specifications

All specifications are guaranteed unless noted otherwise. All specifications apply to all models unless noted otherwise.

Data input (single-ended)
Number of taps
9 physical taps standard with four time-domain mapped taps depending on the data rate.
Operating data rate range
LE160, 4 Gb/s to 21 Gb/s

LE320, 8 Gb/s to 32 Gb/s1

1Operation down to 8 Gbps is supported with single tap response.

Coupling
AC coupled
Maximum data input level
800 mvp-p (typical)
The maximum input signal level acceptable to the data input for proper operation. Not the input damage level.
Data input sensitivity
40 mVp-p, (typical)

The minimum input signal level acceptable to the data input for proper operation

Data input termination
100 Ω differential

50 Ω single-ended

Connector type
2.92 mm female
Input return loss
(typical)
LE160
10 dB RL 0.2 to 7 GHz

5 dB RL > 7 GHz to 30 GHz

LE320
10 dB RL 0.2 to 7 GHz

5 dB RL > 7 GHz to 30 GHz

Data output (differential)
Minimum settable amplitude range (DP/DN)
0 mVp-p to 2000 mVp-p maximum differential

Pattern: 1100, taps set for flat loss

Settable amplitude resolution
0.15 dB (typical)
Coupling
AC coupled
LE160-LE320-Linear-Equalizer-Datasheet
Skew between DP and DN
<2 ps (typical), 4 ps (specified), taps set for flat frequency response
Additive random jitter
LE160
220 fsRMS (typical), input pattern 1100  1
LE320
300 fsRMS (typical), input pattern 1100  1

1Additive Jitter. The LE320/LE160 can be configured to many conditions resulting in increased Data Dependent Jitter (DDJ) and Random Jitter (Rj), for example in a backplane emulation configuration. The LE320 can be tuned to have < 300 fs RJ RMS and < 6 ps of DDJ.

Tap range
-63 to +63 tap settings
Tap resolution
1.6%, any tap
Connector type
2.92 mm, female
Zero output state timing constant
±600 mV, single ended signaling level to 0 V ±10 mV in ≤ 40 UI = 2.9 ns; idle state (fall time after enable asserted)
Consecutive run length amplitude droop
<10 % maximum droop (typical)
Physical characteristics

Dimensions are with bumpers attached.

Height
4.01 cm (1.58 in.)
Width
12.62 cm (4.97 in.)
Depth
9.02 cm (3.55 in.)
Weight
0.34 kg (12 oz.)
Control interface
Computer programmable interface
USB, program all interface settings
Last Modified: 2018-01-29 04:00:00
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