Design Methodology for a 40-GSamples/s Track and Hold Amplifier in 0.18-$muhbox m$SiGe BiCMOS Technology

A 40-GSamples/s track and hold amplifier (THA) is designed and fabricated in 0.18-$muhbox m$SiGe BiCMOS and operates from a 3.6-V supply. The total power consumption is 540 mW with a chip area of 1.1$hbox mm^2$. Time domain measurements demonstrate 40-GHz sampling and$ S$-parameter measurements show a 3-dB bandwidth of 43 GHz in track mode. For 19-GHz input signals, a total harmonic distortion of$-hbox 27~dB$at the 1dB compression point has been measured and a spurious-free dynamic range of 35 dB has been achieved.