© The Institution of Engineering and Technology
A novel resistance-to-digital converter (RDC), based on the integrating type analogue-to-digital converter principle, is presented in this study. The conversion time of the proposed scheme is not a function of the current value of the parameter being measured. Thus, by suitably setting this parameter, the converter can be made to reject the effects of interference at a particular frequency, such as, that due to power-line at 50/60 Hz. Error analysis was conducted to ascertain the effects of non-idealities of various components of the circuit, on its output. Simulation studies were carried out in LTSPICE to verify the linearity and the interference rejection capability of the converter. Further, a prototype RDC was developed in the laboratory and tested to confirm the results of the simulation.
References
-
-
1)
-
2)
-
14. Reverter, F., Gasulla, M., Pallas-Areny, R.: ‘Analysis of interference effects on period-to-digital conversions’, Meas. Sci. Technol., 2005, 16, (11), p. 2261.
-
3)
-
4. Park, J.-M., Jun, S.-I.: ‘A resistance deviation-to-time interval converter for resistive sensors’. Proc. IEEE Int. SOC Conf., September 2008, pp. 101–104.
-
4)
-
7. Reverter, F., Jordana, J., Gasulla, M., et al: ‘Accuracy and resolution of direct resistive sensor-to-microcontroller interfaces’, Sens. Actuators A Phys., 2005, 121, (1), pp. 78–87.
-
5)
-
16. Ficchi, R.F.: ‘Practical design for electromagnetic compatibilty’ (Hayden Book Company, 1971).
-
6)
-
20. Mutoh, A., Nitta, S.: ‘Noise immunity characteristics of dual-slope integrating analog-digital converters’. Proc. Int. Symp. on Electromagnetic Compatibility, 1999, pp. 622–625.
-
7)
-
21. Quilez, M., Casas, O., Pallas-Areny, R.: ‘Susceptibility of dual-slope ADCs to electromagnetic interference: an experimental analysis’. Proc. IEEE IMTC, May 2007, pp. 1–4.
-
8)
-
15. Reverter, F., Gasulla, M., Pallas-Areny, R.: ‘Analysis of power supply interference effects on quasi-digital sensors’, Sens. Actuators A Phys., 2005, 119, (1), pp. 187–195.
-
9)
-
10. Sreenath, V., Semeerali, K., George, B.: ‘A Resistance-to-digital converter possessing exceptional insensitivity to circuit parameters’. 2016 IEEE I2MTC, Taipei, 2016, pp. 1–5.
-
10)
-
11)
-
1. Pallas-Arney, R., Webster, J.G.: ‘Sensors and signal conditioning’ (John Wiley and Sons, 2001).
-
12)
-
22. Vooka, P., George, B.: ‘Capacitance-to-digital converter for leaky capacitive sensors’, IET Electron. Lett., 2016, 52, (6), pp. 456–458.
-
13)
-
19. So, H.C.: ‘Adaptive algorithm for sinusoidal interference cancellation’, IET Electron. Lett., 1997, 33, (22), pp. 1910–1912.
-
14)
-
15)
-
12. Otahal, J., Hruska, F.: ‘Aspects of electromagnetic interference in low frequencies ranges: Electromagnetic interference in the 50 Hz frequency’. Proc. Int. Carpathian Control Conf., May 2014, pp. 413–417.
-
16)
-
9. Mohan, N.M., Kumar, V.J., George, B.: ‘A novel dual-slope resistance-to-digital converter’, IEEE Trans. Instrum. Meas., 2010, 59, (5), pp. 10013–11018.
-
17)
-
6. Kim, H., Chung, W.S., Kim, H.J., et al: ‘A resistance deviation-to-pulse width converter for resistive sensors’, IEEE Trans. Instrum. Meas., 2009, 58, (2), pp. 397–400.
-
18)
-
3. Li, X., Meijer, G.C.M.: ‘A smart and accurate interface for resistive sensors’, IEEE Trans. Instrum. Meas., 2001, 50, (6), pp. 1648–1651.
-
19)
-
18. Trudeau, L.C., Gagnon, F.: ‘Suppression of multiple power line harmonic interference for low frequency signals’, IET Electron. Lett., 2013, 49, (2), pp. 114–116.
-
20)
-
2. Ferrari, V., Marioli, D., Taroni, A.: ‘Oscillator-based interface for measurand-plus-temperature readout from resistive bridge sensors’, IEEE Trans. Instrum. Meas., 2000, 49, (3), pp. 585–590.
-
21)
-
8. Lopez-Lapena, O., Serrano-Finetti, E., Casas, O.: ‘Low-power direct resistive sensor-to-microcontroller interfaces’, IEEE Trans. Instrum. Meas., 2016, 65, (1), pp. 222–230.
-
22)
-
11. Mohan, N, George, B., Kumar, V.J.: ‘Analysis of a Sigma-Delta resistance to digital converter suitable for differential resistive sensors’, IEEE Trans. Instrum. Meas., 2009, 58, (5), pp. 1617–1622.
-
23)
-
5. Kaliyugavaradan, S.: ‘A linear resistance-to-time converter with high resolution’, IEEE Trans. Instrum. Meas., 2000, 49, (1), pp. 151–153.
-
24)
-
17. Pinter, A., Denes, I.: ‘Interface circuit for measuring small capacitance changes in sensor networks’, IET Sci. Meas. Tech., 2015, 9, (5), pp. 570–578.
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-cds.2016.0236
Related content
content/journals/10.1049/iet-cds.2016.0236
pub_keyword,iet_inspecKeyword,pub_concept
6
6