Title :
Design of highly linear tunable CMOS OTA
Author :
Koziel, S. ; Szczepanski, S. ; Schaumann, R.
Author_Institution :
Fac. of Electron., Telecommun. & Informatics, Tech. Univ. Gdansk, Poland
Abstract :
An analytical method based on the standard square-law MOS model for the design of a highly linear, fully differential CMOS operational transconductance amplifier (OTA) is presented. The proposed circuit implementation combines a cross-coupled quad cell with a source-coupled differential pair, linked by current mirrors. Improved linearity of the OTA over a large tuning range is obtained. SPICE simulations show that for ±2.5-V, power supply power consumption is 6.6 mW, total harmonic distortion (THD) at 2.5 Vpp is less than 0.2%, and the dynamic range is 77 dB.
Keywords :
CMOS analogue integrated circuits; SPICE; circuit tuning; current mirrors; differential amplifiers; integrated circuit design; integrated circuit modelling; operational amplifiers; 2.5 V; 6.6 mW; SPICE simulation; analytical design method; cross-coupled quad cell; current mirror; dynamic range; linear tunable fully-differential CMOS operational transconductance amplifier; power consumption; source-coupled differential pair; square-law MOS model; total harmonic distortion; Circuit optimization; Circuit simulation; Differential amplifiers; Linearity; Mirrors; Operational amplifiers; SPICE; Semiconductor device modeling; Transconductance; Tunable circuits and devices;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010328
