Abstract
A fully differential 40 Gsample/s Track and Hold Amplifier (THA) with high dynamic range and large bandwidth is designed and fabricated in a 210 GHz-f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</sub> -InP-DHBT process. To optimize the THA performances, the THA core characteristics are extensively investigated, both by simulations and measurements. Spectral measurements performed on the THA in track mode give a THD and a SFDR of -42.5 dB and -43.8 dB, respectively, for input frequency up to 9 GHz and input voltage up to -2 dBm. This THD is equivalent to 6.7 ENOB. Time domain measurement demonstrates the THA performances for 40 GHz sampling with 2 GHz sinusoidal input signal.
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