Title :
A low-distortion switched-source-follower track-and-hold circuit
Author :
Moriyama, A. ; Taniyama, S. ; Waho, T.
Author_Institution :
Dept. of Inf. & Commun. Sci., Sophia Univ., Tokyo, Japan
Abstract :
A novel switched-source-follower track-and-hold (T/H) circuit has been proposed, where an input source-coupled pair conventionally used preceding the source-follower switch is replaced with another source-follower stage. Suppressing signal-dependent sample-timing jitter, which is due to the channel-length modulation of the input transistor, leads to a low-distortion T/H operation. Circuit simulation assuming a 0.1-μm InP-based HEMT technology has revealed an SFDR improvement from 58dB to 70dB for input and sampling frequencies of 3 GHz and 20 GHz, respectively. Although the present result is based on the high-speed compound semiconductor technology, the idea behind this can be applied to T/H circuits using nano-scale MOSFETs with reduced output impedance.
Keywords :
III-V semiconductors; MOSFET; circuit simulation; high electron mobility transistors; indium compounds; nanoelectronics; sample and hold circuits; timing jitter; InP; InP-based HEMT technology; channel-length modulation; circuit simulation; frequency 20 GHz; frequency 3 GHz; high-speed compound semiconductor technology; input source-coupled pair; low-distortion T-H operation; low-distortion circuit; nanoscale MOSFET; signal-dependent sample-timing jitter; size 0.1 mum; source-follower switch; switched-source-follower circuit; track-and-hold circuit; Clocks; HEMTs; Integrated circuit modeling; Jitter; Logic gates; Radar tracking; Switching circuits;
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2012 19th IEEE International Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4673-1261-5
Electronic_ISBN :
978-1-4673-1259-2
DOI :
10.1109/ICECS.2012.6463788
