Compact high-gain lumped differential 40 Gb/s driver amplifiers in production 0.15 /spl mu/m PHEMT technology

High-performance and very compact 40 Gb/s driver amplifiers were realized in mature 0.15 /spl mu/m depletion PHEMT technology. The 3-stage lumped differential drivers feature a large differential 40 Gb/s output swing of up to 7.5 V/sub pp/, RMS jitter of less than 800 fs, rise and fall times of less than 10 ps and more than 27 dB gain. The small size (1.4/spl times/1.7 mm) and ability to have DC coupled in- and output, enable compact and cost-effective optical 40 Gb/s long-haul transmitters with system grade NRZ and RZ eye diagrams.