M8054A Interference Source 32 GHz

M8054A Interference Source

32 GHz

M8054A at a Glance

The Keysight M8054A interference source allows to generate repeatable and accurate level impairments for testing of high-speed digital receivers that support symbol rates of up to 64 Gbaud.

Key features:

• Key feat Random level interference (so-called “white noise”) with crest factor > 5

• Sinusoidal level interference

• Common mode and differential mode

• Bandwidth adjustable from 160 kHz up to 32 GHz, enough for 58Gbaud signals (fnyquist/2)

• 4 output channels with differential signals avoiding baluns

• Adjustable amplitude up to 1 Vpp (single ended), 2 Vpp (differential)

• 1-slot AXIe module for combined configurations with M8040A high-performance BERT

• Matched coupler pairs for interference injection before and after the ISI channel (NEXT, FEXT)

• Graphical user interface and remote control integrated in the M8070B system software for M8000 series of BER test solutions

Figure 2. 26 Gbaud NRZ signal without interference (left) and with random level interference (right) added from M8054A. The example shows a signal from M8040A high-performance BERT without ISI channel.

Figure 3. Random (gaussian) interference signal with a flat spectrum and bandwidth of 26 GHz, which corresponds to half of Nyquist frequency at 52 Gbaud data.

Typical applications:

The M8054A allows emulation of level interference for digital receiver tolerance testing. Typical applications that require sinusoidal or random interference signal are:

• PCIe 3/4/5/6 receiver testing

• SAS receiver testing

• TBT receiver testing

• OIF CEI - 56G and -112G receiver stress testing for medium and long reach

• Channel operating margin test as defined by IEEE 802.3bs, bj, by, cd, ck

• Optical receiver stress test according to IEEE802.3bs, bj, by, cd, Fibre Channel

Figure 4. Typical interference tolerance test setup for Ethernet receivers. In this example a gaussian noise source is required for injecting level interference after the ISI channel. Example from IEEE 802.3bj™-2014, Annex 93A.

Figure 5. Typical PCI Express receiver stress calibration setup. In this case, the simultaneous injection of common mode (CM) and differential mode (DM) sinusoidal interference (SI) is required before the channel.

Figure 6. Keysight provides matched coupler pairs for injecting interference for differential signals minimizing differential skew, reflections and loss. Two versions are available (M8045A-802 and M8045A-803) for different bandwidth requirements. The image shows the interference coupler pair (M8045A-803) mounted directly to the data outputs of M8040A pattern generator. Matched coupler pairs with optimized loss ensure best signal fidelity even for symbol rates of 32 Gbaud and beyond.

Specifications

Output Channel 1, 2, 3, 4

Table 1. Specifications for M8054A output channels 1 - 4                    

Sinusoidal and random interference

The Keysight M8054A interference source, can be used as level interference source with sinusoidal and random modulation (also called gaussian or white noise).

The M8000 system software controls the interference parameters such as amplitude, frequency, bandwidth. Keysight provides matched directional coupler pairs for injecting the RI or SI signal before or after the channel (see recommended accessories).

Table 2. Specifications for M8054A output channels 1 – 4

Reference clock input

For future use.

Reference clock output

For future use.

Table 4. Reference clock input and output specifications

User Interface and Remote Control

The M8070B system software for M8000 series is required to control the parameters of M8054A.

Table 5. Software for M8054A module