112 GBaud (224 Gb/s) large output swing InP DHBT PAM-4 DAC-driver
Résumé
In this paper, we report on the design, optimisation and and electrical measurements of a PAM-4 DAC-driver fabricated in 0.7-μm InP/GaAsSb DHBT technology, with the capability to directly drive an electro-optical modulator. Circuit measurements in PAM-4 mode show high diagram quality at 90 GBaud (180 Gb/s) with a record 5.5–V pp differential output swing. An over 12-dB gain control capability is shown. Moreover, a record 3.35-V pp output swing is obtained in PAM-4 at 112 GBaud (224 Gb/s). Power consumption is 1.1 and 0.6 W for two operating symbol-rates respectively.
Mots clés
modulator-driver
integrated circuit (IC)
Indium Phosphide (InP)
Double Heterojunction Bipolar Transistor (DHBT)
high speed circuits
optical communications
PAM-4 format
Power demand
Power measurement
Quadrature amplitude modulation
Modulation
DH-HEMTs
Predistortion
III-V semiconductor materials
digital-analogue conversion
driver circuits
electro-optical modulation
gallium compounds
heterojunction bipolar transistors
III-V semiconductors
indium compounds
integrated circuit design
integrated circuit measurement
low-power electronics
optimisation
pulse amplitude modulation
DHBT PAM-4 DAC-driver
electrical measurements
electro-optical modulator
circuit measurements
gain control
DHBT technology
InP-GaAsSb