A compact nanopower low output impedance CMOS operational amplifier for wireless intraocular pressure recordings.
Wireless sensing has shown potential benefits for the continuous-time measurement of physiological data. One such application is the recording of intraocular pressure (IOP) for patients with glaucoma. Ultra-low-power circuits facilitate the use of inductively-coupled power for implantable wireless systems. Compact circuit size is also desirable for implantable systems. As a first step towards the realization of such circuits, we have designed a compact, ultra-low-power operational amplifier which can be used to record IOP. This paper presents the measured results of a CMOS operational amplifier that can be incorporated with a wireless IOP monitoring system or other low-power application. It has a power consumption of 736 nW, chip area of 0.023 mm2, and output impedance of 69 Omega to drive low-impedance loads.
Dresher
Russell P
RP
Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609 USA. rdresher@purdue.edu
Irazoqui
Pedro P
PP
D000669:Amplifiers, Electronic; D017076:Computer-Aided Design; D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008904:Miniaturization; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012666:Semiconductors; D012680:Sensitivity and Specificity; D013686:Telemetry / Q000295:instrumentation*; D014065:Tonometry, Ocular / Q000295:instrumentation* / Q000379:methods