Title :
A 0.5 μA offset-free current comparator for high precision current-mode signal processing
Author :
Wu, Chung-Yu ; Chen, Chih-Cheng ; Tsai, Ming-Kai ; Cho, Chih-Che
Author_Institution :
Nat. Chiao Tung Univ., Hsin-Chu, Taiwan
Abstract :
A current-domain auto-zero technique and a fully differential current amplifier are developed to realize a offset-free current comparator. Simulation results show that the current comparator can receive a 0.5 μA input current in 1.3 μs even if the current amplifiers and the 1-V converter have offset currents of 20 μA. Its push-pull structure overcomes the slew-rate limiting problem and the fully differential configuration offers a high immunity to clock feedthrough noise and power supply variations
Keywords :
comparators (circuits); differential amplifiers; 0.5 muA; current comparator; current-domain auto-zero technique; current-mode signal processing; fully differential configuration; high precision; offset-free; push-pull structure; Analog-digital conversion; Circuit simulation; Differential amplifiers; Digital audio players; Feedback circuits; Signal design; Signal processing; Signal resolution; Switches; Voltage;
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
DOI :
10.1109/ISCAS.1991.176761
