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32 Gbps Dual Channel Optical Modulator Driver

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Production, Recommended for New Designs

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Data Rate (Gbps) Function Gain (dB) Group Delay Variation (ps) Additive Jitter (ps) Output Voltage Max. (Vp-p) Package
32 Dual Channel Optical Modulator Driver 30 ±4 0.3 8 BGA


• Integrated Dual Channel
• Integrated High Frequency Bias-Tee
• High Channel to Channel Isolation
   >30dB up to 30GHz
• Adjustable Output Amplitude
   up to 9Vpp (VDD=7V)
• Wide Power Supply Range
• Low Power Dissipation: 0.9W per
   channel total for Vout=6Vpp, VDD=5V
• Low Channel to Channel Skew < 1ps
• Top or Bottom Cooling Flexibility
• Integrated Peak-Detect Feature
• Compact BGA Package:
    13.76 x 13 x 3.63 mm

Typical Applications

• 100 Gbps Long Haul DP-QPSK
• 100 Gbps Metro
• 40 Gbps DQPSK

Functional Diagram


General Description

The HMC6620BG is a dual channel driver amplifier designed for 40 Gbps and 100 Gbps Mach-Zehnder optical modulator driver applications. Features such as high gain across a wide frequency range, low power dissipation, very compact size, integrated peak detector function, fast rise/fall time, and integrated bias-T inductor make the HMC6620BG a best-in-class product.

The driver provides 8Vpp saturated output swing and features output swing cross point adjustment. There are only 4 DC control signals required to tune the crossing and output RF amplitude. The integrated bias-tee eliminates the need for external coils and simplifies the PCB design, also lowering cost.

HMC6620BG has a wide supply (Vdd) operating range from +5V to +7V, and the RF I/Os are internally matched to 50 Ohms. HMC6620BG provides Long Haul designers with scalable power dissipation for varying output drive requirements. (1.4W per channel at Vout = 8Vpp and 1.0W per channel at Vout = 7Vpp) Integrated peak-detect feature as a part of the MZ modulator bias loop enables the output swing (Vπ) stability of LiNOb3 modulator for calibration and field monitoring.