A 20 Gb/s InP DHBT driver IC with high output voltage swing for direct and external laser modulation

A 20 Gb/s driver IC developed for direct and external laser modulation is presented. The single-ended output voltage swing is as high as 4 V/sub pp/ (8 V/sub pp/ differential) at 50 /spl Omega/ load. The circuit was fabricated in a standard InP-InGaAs double heterojunction bipolar transistor technology.