A Novel High-Frequency Track-and-Hold Amplifier for Time-interleaved ADCs

In this paper, a new high-speed, low-power track-and-hold amplifier (T/H) has been presented which has been optimized to be used in high resolution time-interleaved analog-to-digital converters (ADCs). Taking advantage of using power-switching technique and improved source-follower (SF), a low-power, linear T/H amplifier has been designed. Simulation results in 0.9μm CMOS technology shows that with a differential input signal of 200MHz and 1Vpp, the T/H achieves total harmonic distortion of 71dB at sampling frequency of 2.6GHz. Besides, while driving a 1pF capacitive load, the T/H consumes 10.6 mW from the 1.2 V supply.

Keywords:

Track-and-hold amplifier , High-frequency design , time-interleaving track-and hold amplifiers