A 20-Gs/s track-and-hold amplifier in InP HBT technology

Abstract

This paper presents a 20-Gs/s track-and-hold amplifier (THA) fabricated InP HBT technology. This THA is capable of operating under relatively high input voltages. The THA uses a fully differential architecture with a switched emitterfollower. To mitigate the pedestal error due to the feedthrough attenuation network, we added degeneration resistors in the feedthrough attenuation block. Measured total harmonic distortion is below 40 dB at low input frequencies, and 18 dB at frequency of 9.9 GHz. © 2010 IEEE.