Abstract
In this article, we present a low-power fully pseudo-differential open-loop BiCMOS track-and-hold amplifier (THA) based on the switched emitter–follower (SEF). A high linear unity-gain buffer is designed to act as the input stage of THA for improving the linearity of the THA. The fast turn-off circuit is used to turn off the SEF rapidly; so, the aperture delay of the THA can be shortened. The simulations using TSMC 75 GHz f T 0.35-µm SiGe BiCMOS technology show that the proposed architecture achieves a spurious free dynamic range of 55.52 dB and a signal-to-noise distortion ratio of 54.27 dB for 58.59375 MHz input frequency at 1 G Sample/s. The power dissipation is 45 mW.
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