Description
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 offer flexible controls permitting the user to tune these levels
of preemphasis as needed for 100G 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 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.
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
- 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