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.
|Number of pages||4|
|Journal||Proceedings - IEEE International Symposium on Circuits and Systems|
|State||Published - 1 Dec 1991|
|Event||1991 IEEE International Symposium on Circuits and Systems Part 4 (of 5) - Singapore, Singapore|
Duration: 11 Jun 1991 → 14 Jun 1991