A 65μA 8MHz On-Chip Oscillator with LDO regulator for low-power handheld SoC applications

Author

Day, J. ; Vulpoiu, P. ; Johnson, O.K. ; Julich, J. ; Lie, D.Y.C.

Author_Institution

Dept. of Electr. Eng., Texas Tech Univ., Lubbock, TX, USA

fYear

2008

fDate

20-23 Oct. 2008

Firstpage

2027

Lastpage

2030

Abstract

This paper discusses an 8MHz square wave oscillator used for a clock signal of the digital core of a mixed signal integrated circuit (IC). The frequency is determined by a bias current that charges a capacitor until it triggers a comparator with a voltage reference as the second input. A low drop out (LDO) voltage regulator is used to supply the oscillator so that variations in the battery voltage do not affect the oscillator.. The circuits have been designed and taped out and the measured results are closed to the SPICE simulated values. The oscillator has very low power consumption of 165 μW which is very attractive for a general handheld device that is operated off of a battery.

Keywords

mixed analogue-digital integrated circuits; oscillators; system-on-chip; voltage regulators; LDO regulator; current 65 μA; frequency 8 MHz; low drop out voltage regulator; low-power handheld SoC; mixed signal integrated circuit; on-chip oscillator; power 165 μW; square wave oscillator; Battery charge measurement; Capacitors; Clocks; Digital integrated circuits; Frequency; Mixed analog digital integrated circuits; Regulators; SPICE; Voltage; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State and Integrated-Circuit Technology, 2008. ICSICT 2008. 9th International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4244-2185-5

Electronic_ISBN

978-1-4244-2186-2

Type

conf

DOI

10.1109/ICSICT.2008.4734964

Filename

4734964