Simple and performing temperature-compensated voltage references [articol]

Abstract

The paper proposes four new reference voltage sources (VR) based on the cross-connected current mirrors. The temperature coefficient of the two of proposed VR is smaller than 3 ppm/°C over the temperature range of 0…100ºC and the total transistor count is reduced. These performances result by using the first- and second-order temperature compensation techniques and resistors having a particular temperature coefficient. The process and temperature variations of the reference voltage were minimized by optimal design of resistors width; thus, for a CMOS 0.35-µm process, one gets less than 1% variation.