Product Overview

NeoPhotonics’ GaAs 53 Gbaud PAM4 driver IC is a linear, differential driver optimized for 1 x 100 Gbps and 4 x 100 Gbps applications requiring PAM4 modulation. This driver, implemented in a high-performance GaAs PHEMT process, provides RF output voltage that is well suited to modulate silicon and InP Mach-Zender Modulators (MZM) while maintaining exceptional TDECQ. Its adjustable gain range of 6 dB allows easy interface to a wide range of PAM4 DSPs while maintaining deep modulation to the MZMs.

This driver comes in single- and quad-channel configurations featuring 625- or 700-um channel pitch. The wider channel pitch of 700-um exhibits 4 dB better inter-channel cross-talk penalty in comparison to the 625-um version.

Features

    • TSV (through-substrate vias) for solid signal ground implementation
    • Adjustable gain control for easy interface to a variety of PAM4 DSPs
    • 625- and 700-um channel pitches for selectable inter-channel cross-talk penalty
    • Available in single- and quad-channel versions

Benefits

    • Large, highly linear RF differential output swing suited to drive Si MZMs
    • Compact die size suited for CoB (chip-on-board) assembly aimed at Qsfp-DD and Osfp transceivers
    • Qualified for non-hermetic environment

Details

ParametersSpecifications
Data rate53 GBd
Bandwidth, typical35 GHz
Output voltage swing, typical3.5 Vpp
Gain, maximum18.5 dB
Gain adjustment range6 dB
THD at 1 GHzUnder 3%
Channel pitch625 um and 700 um
Power consumption, typical0.6W/channel
Die size1.47 x 3.2 mm
Process technologyGaAs PHEMT