500 MHz high resolution proximity sensors with fully integrated digital counter

被引：0
|
作者：
Farsi, Reza [1 ]
Solmaz, Nergiz Sahin [1 ]
Khosropour, Naser [2 ]
Jacinto, Bruno [2 ]
Giroud, Frederic [2 ]
Boero, Giovanni [1 ]
机构：
[1] Ecole Polytech Fed Lausanne EPFL, Microsyst Lab, CH-1015 Lausanne, Switzerland
[2] HMT Microelect AG, Alfred Aebi Str 75, CH-2503 Biel, Switzerland
来源：
MEASUREMENT | 2023年 / 217卷
关键词：
Inductive proximity sensor; CMOS; Analog-digital mixed measurement method; Picometer resolution; Position detection; Eddy current displacement sensor; Frequency counter; EDDY-CURRENT; NOISE; OSCILLATOR; DESIGN; MODEL; GHZ;
D O I：
10.1016/j.measurement.2023.113045
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report on the design and characterization of two inductive proximity sensors based on LC oscillators operating at 500 MHz. The distance from the target is obtained by measuring the oscillation frequency variation. Both sensors contain an off-chip LC resonator consisting of a two turns 4 mm diameter planar coil and a ceramic capacitor. The LC resonator is connected to integrated CMOS electronics. The first sensor output stage consists of a buffer whereas the second sensor output stage includes a co-integrated 21 bits digital V frequency counter. The first sensor has frequency noise floor of 0.085 Hz/ VHz above 3 kHz. At a distance of 200 & mu;m from the coil, the resolution is 0.2 pm/Hz and the integrated resolution from 1 mHz to 1 kHz is 22 V V pmrms. The second sensor reaches a noise floor of 2 Hz/ Hz corresponding to a resolution of 5 pm/ Hz and an integrated resolution of 900 pmrms.
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页数：8
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