Temperature compensation in bootstrapped current reference source

This paper firstly analysis the principle of the bootstrapped current reference source and offers the equation of the fractional temperature coefficient of the reference current. With example of LVD (Low Voltage Detector), author then presents a method to gain an adjustable fractional temperature coefficient by utilizing two different types of resistors with appropriate value matching. Finally, LVD circuit has been simulated with Affirma Spectre simulator of Cadence. The result of simulation proves that this method can obtain a PTAT-like (PTAT: Proportional To Absolute Temperature) current without using bipolar transistors, which requires more costly BiCMOS technology LVD circuit in this paper has been implemented with TSMC 0.25 /spl mu/m CMOS technology.