Title :
On the Design of Very Small Transconductance OTAs with Reduced Input Offset
Author :
Arnaud, Alfredo ; Fiorelli, Rafaella ; Galup-Montoro, Carlos
Author_Institution :
DIE Univ. Catolica, Montevideo
Abstract :
This paper demonstrated from the theory and measurements, that series-parallel (SP) mirrors allow building current copiers with copy factors of thousands, without degrading mismatch or noise performance. SP current-division is then employed to design OTAs ranging from a few pS to a few nS, with up to 1V linear range, consuming in the order of 100nW, and with a reduced area. An integrated 3.3s time-constant integrator was also presented. One-by-one several design non-idealities are revised: linearity, offset, noise, leakages; as well as layout techniques. A final analysis concludes that SP-association of transistors allows to build very efficient transconductors, for demanding applications in the field of implantable electronics among others
Keywords :
CMOS analogue integrated circuits; current mirrors; integrated circuit design; low-power electronics; operational amplifiers; 100 nW; 3.3 s; CMOS integrated circuits; analog design; copy factor; implantable electronics; layout techniques; operational transconductance amplifiers; series-parallel mirror; time-constant integrator; transconductor; Buildings; Current measurement; Degradation; Implants; Linearity; Mirrors; Noise measurement; Transconductance; Transconductors; Transistors; Analog design; CMOS; Design; low-power;
Conference_Titel :
Integrated Circuits and Systems Design, 18th Symposium on
Conference_Location :
Florianopolis
Print_ISBN :
1-59593-174-0
DOI :
10.1109/SBCCI.2005.4286825
