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

A 40-GSamples/s track and hold amplifier (THA) is designed and fabricated in 0.18-mum SiGe BiCMOS and operates from a 3.6-V supply. The total power consumption is 540 mW with a chip area of 1.1 mm2. 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 -27 dB at the 1dB compression point has been measured and a spurious-free dynamic range of 35 dB has been achieved