A Low Power Bandgap Voltage Reference Circuit with PSRR Enhancement

Conference: PRIME 2012 - 8th Conference on Ph.D. Research in Microelectronics & Electronics
06/12/2012 - 06/15/2012 at Aachen, Germany

Proceedings: PRIME 2012

Pages: 4Language: englishTyp: PDF

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Liao, Lei; Lohaus, Lukas; Atac, Aytac; Strache, Sebastian; Wunderlich, Ralf; Heinen, Stefan (Chair of Integrated Analog Circuits, RWTH Aachen University, Sommerfeldstrasse 24, 52074 Aachen, Germany)

This paper presents a low power high PSRR bandgap voltage reference (BGR) circuit. Two concepts for PSRR enhancement are investigated and evaluated in this work. The designed BGR circuit operates with 2.7 V and generates a reference voltage of 1.26 V. The BGR circuit provides -82.6 dB power supply rejection ratio (PSRR) at 1 MHz and the PSRR at DC region is also below -80 dB. The PSRR enhancement is implemented by using a low power low drop out voltage regulator (LDO) integrated into the BGR circuit. The overall current consumption of the design is less than 60 muA.