Broadcom 3-nm CMOS 800G (8:4) PAM-4 Transceiver PHY with Integrated Laser Driver - BCM83820-DIE

The Broadcom BCM83820-DIE is the industry’s first and highest performance and lowest-power 3-nm 200G/lane PAM-4 Gearbox PHY with integrated laser driver to enable 800G DR4 and FR4 pluggable transceivers for next-generation AI/ML clusters and Ethernet networking of hyperscale data centers.

The BCM83820-DIE leverages the market-leading DSP and equalization technology of 200G/lane PAM-4 PHY, already proven with the BCM85828-DIE, and designed with best-in-class Broadcom 3-nm 200G per lane SerDes technology. The advanced Broadcom DSP and equalization technology compensate for optical impairments while delivering best-in-class transceiver performance in BER and power consumption.

The BCM83820-DIE integrates the laser driver for 200G/lane EML and SiPh optics to not only simplify the transceiver design, but also to deliver the best-in-class optical transmitter performance with lowest power consumption. The BCM83820-DIE, designed with 3-nm SerDes, the same as Broadcom leading switch silicon, guarantees interoperability when paired with Broadcom switch and provides an unmatched competitive advantage to the market.

The BCM83820-DIE incorporates a highly differentiated feature set, including multiple line-side FEC options:

• Bypass mode
• Segmented mode
• Concatenated mode

The BCM83820-DIE is a monolithic 800G (8:4) PAM-4 DSP. It converts eight lanes of 106.25 Gb/s from the client side into four lanes of 212.5 Gb/s or 226.875G to drive next-generation high-density optical PAM-4 links inside an octal small form-factor pluggable (OSFP) module.

The BCM83820-DIE also features a crossbar on both the client side and line side for easier routing in the PCBs.

The on-chip clock synthesis is performed by a low-cost 625-MHz reference clock through high-frequency, low-jitter phase-locked loops (PLLs).