In this paper, a new configuration of operational amplifier -based square-wave oscillator is proposed. The circuit performs an impedance-to-period (Z–T) conversion that, instead of a voltage integration typically performed by other solutions presented in the literature, is based on a voltage differentiation. This solution is suitable as first analogue uncalibrated front-end for capacitive and resistive (e.g. relative humidity and gas) sensors, working also, in the case of capacitive devices, for wide variation ranges (up to six capacitive variation decades). Moreover, through the setting of passive components, its sensitivity can be easily regulated. Experimental measurements, conducted on a prototype printed circuit board, with sample passive components and using the commercial capacitive humidity sensor Honeywell HCH-1000, have shown good linearity and accuracy in the estimation of capacitances, having a baseline or reaching a value ranging in a wide interval [picofarads–microfarads], as well as, with a lower accuracy, in the evaluation of more reduced variations of resistances, ranging from kiloohms to megaohms, also when compared with other solutions presented in the literature.

References

1. 1)
  - 32. Mason, A., Chavan, A.V., Wise, K.D.: ‘A mixed-voltage sensor readout circuit with on-chip calibration and built-in self-test’, IEEE Sens. J., 2007, 7, pp. 1225–1232 (doi: 10.1109/JSEN.2007.897957).
2. 2)
  - 44. Senani, R.: ‘A new technique for inductance-to-time-period conversion using integrated circuit operational amplifiers’, IEEE Trans. Ind. Electron. Control Instrum., 1980, IECI-27, pp. 36–37.
3. 3)
  - 48. Goras, L., Marcuta, C.: ‘Comment on ‘A new technique for inductance-to-time-period conversion using integrated circuit operational amplifiers’’, IEEE Trans. Ind. Electron., 1985, IE-32, p. 85 (doi: 10.1109/TIE.1985.350146).
4. 4)
  - 47. Goras, L., Marcuta, C.: ‘On linear inductance- and capacitance-time conversions using NIC-type configurations’, IEEE Trans. Ind. Electron., 1993, 40, pp. 529–531 (doi: 10.1109/41.238021).
5. 5)
  - 1. De Marcellis, A., Ferri, G.: ‘Analog circuits and systems for voltage-mode and current-mode sensor interfacing applications’ (Springer, 2011, Dordrecht, 1st edn.).
6. 6)
  - 56. D'Amico, A., Di Natale, C.: ‘A contribution on some basic definitions of sensors properties’, IEEE Sens. J., 2001, 1, pp. 183–190 (doi: 10.1109/JSEN.2001.954831).
7. 7)
  - 43. De Graaf, G., Wolffenbuttel, R.F.: ‘Circuit for readout and linearization of sensor bridges’. Proc. 30th European Solid-State Circuits Conf., Leuven, Belgium, September 2004, pp. 451–454.
8. 8)
  - 15. Rastrello, F., Placidi, P., Scorzoni, A.: ‘A system for the dynamic control and thermal characterization of ultra low power gas sensors’, IEEE Trans. Instrum. Meas., 2011, 60, pp. 1876–1883 (doi: 10.1109/TIM.2010.2089130).
9. 9)
  - 2. De Marcellis, A., Ferri, G., Mantenuto, P.: ‘Resistive sensor interfacing’, in Reig, C., Cardoso, S., Mukhopadhyay, S.C. (Eds.): ‘Giant magnetoresistance (GMR) sensors’ (Springer, 2013, Heidelberg, 1st edn.), pp. 71–102.
10. 10)
  - 42. Pradhan, R., Chatterjee, J., Mandal, M., Mitra, A., Das, S.: ‘Monopolar impedance sensing microdevices for characterization of cells and tissue culture’, Sens. Lett., 2013, 11, pp. 466–475 (doi: 10.1166/sl.2013.2828).
11. 11)
  - 52. Islam, T., Kumar, L., Uddin, Z., Ganguly, A.: ‘Relaxation oscillator-based active bridge circuit for linearly converting resistance to frequency of resistive sensor’, IEEE Sens. J., 2013, 13, pp. 1507–1513 (doi: 10.1109/JSEN.2012.2236646).
12. 12)
  - 28. Balachandran, M.D., Shrestha, S., Agarwal, M., Lvov, Y., Varahramyan, K.: ‘SnO2 capacitive sensor integrated with microstrip patch antenna for passive wireless detection of ethylene gas’, Electron. Lett., 2008, 44, pp. 464–466 (doi: 10.1049/el:20083636).
13. 13)
  - 16. Depari, A., Flammini, A., Marioli, D., et al: ‘A new and fast-readout interface for resistive chemical sensors’, IEEE Trans. Instrum. Meas., 2010, 59, pp. 1276–1283 (doi: 10.1109/TIM.2009.2038292).
14. 14)
  - 7. Vlassis, S., Laopoulos, T., Siskos, S.: ‘Pressure sensors interfacing circuit with digital output’, IET Circuits Devices Syst., 1998, 145, pp. 332–336 (doi: 10.1049/ip-cds:19982270).
15. 15)
  - 55. Nojdelov, R., Nihtianov, S.: ‘Capacitive sensor interface with improved dynamic range and stability’. Proc. IEEE Int. Instrumentation and Measurement Technology Conf. (I2MTC), Montevideo, Uruguay, May 2014, pp. 1373–1376.
16. 16)
  - 39. De Marcellis, A., Ferri, G., Palange, E.: ‘A novel analog autocalibrating phase-voltage converter for signal phase shifting detection’, IEEE Sens. J., 2011, 11, pp. 259–266 (doi: 10.1109/JSEN.2010.2052032).
17. 17)
  - 50. Julsereewong, P., Julsereewong, A., Rerkratn, A., Pootharaporn, N.: ‘Simple resistance-to-time converter with lead-wire-resistance compensation’. Proc. SICE Annual Conf., Waseda University, Tokyo, Japan, September 2011, pp. 2760–2763.
18. 18)
  - 49. Shin, D.-Y., Lee, H., Kim, S.: ‘Improving the accuracy of capacitance-to-frequency converter by accumulating residual charges’, IEEE Trans. Instrum. Meas., 2011, 60, pp. 3950–3955 (doi: 10.1109/TIM.2011.2147650).
19. 19)
  - 51. Kabara, P., Thakur, S., Saileshwar, G., Baghini, M.-S., Sharma, D.-K.: ‘CMOS low-noise signal conditioning with a novel differential resistance to frequency converter for resistive sensor applications’. Proc. IEEE Int. SoC Design Conf. (ISOCC), Jeju, South Korea, November 2011, pp. 298–301.
20. 20)
  - 8. Ferri, G., De Marcellis, A., Di Carlo, C., et al: ‘A second generation current conveyor (CCII)-based low-voltage low-power read-out circuit for DC-excited resistive gas sensors’, IEEE Sens. J., 2009, 9, pp. 2035–2041 (doi: 10.1109/JSEN.2009.2033197).
21. 21)
  - 36. Liu, B., Cai, L., Zhu, J., Kang, Q., Zhang, M., Chen, X.: ‘On-chip readout circuit for nanomagnetic logic’, IET Circuits Devices Syst., 2014, 8, pp. 65–72 (doi: 10.1049/iet-cds.2013.0113).
22. 22)
  - 21. Universal Transducer Interface UTI Datasheet, Smartec, 2008. Available at on-line resource http://www.smartec.nl.
23. 23)
  - 12. Pathak, J.K., Singh, A.K., Senani, R.: ‘Systematic realisation of quadrature oscillators using current differencing buffered amplifiers’, IET Circuits Devices Syst., 2011, 5, pp. 203–211 (doi: 10.1049/iet-cds.2010.0227).
24. 24)
  - 27. Kosterev, A.A., Bakhirkin, Y.A., Tittel, F.K., McWhorter, S., Ashcraft, B.: ‘QEPAS methane sensor performance for humidified gases’, Appl. Phys. B, 2008, 92, pp. 103–109 (doi: 10.1007/s00340-008-3056-9).
25. 25)
  - 23. Bruschi, P., Nizza, N., Piotto, M.: ‘A current-mode, dual slope, integrated capacitance-to-pulse duration converter’, IEEE J. Solid-State Circuits, 2007, 42, pp. 1884–1891 (doi: 10.1109/JSSC.2007.903102).
26. 26)
  - 33. Heidary, A., Meijer, G.C.M.: ‘Features and design constraints for an optimized SC front-end circuit for capacitive sensors with a wide dynamic range’, IEEE J. Solid-State Circuits, 2008, 43, pp. 1609–1616 (doi: 10.1109/JSSC.2008.922390).
27. 27)
  - 9. Depari, A., De Marcellis, A., Ferri, G., Flammini, A.: ‘A complementary metal oxide semiconductor-integrable conditioning circuit for resistive chemical sensor management’, IOP Meas. Sci. Technol., 2011, 22, pp. 2–7.
28. 28)
  - 29. Sahraoui, Y., Barhoumi, H., Maaref, A., Jaffrezic-Renault, N.: ‘A novel capacitive biosensor for urea assay based on modified magnetic nanobeads’, Sens. Lett., 2011, 9, pp. 2141–2146 (doi: 10.1166/sl.2011.1755).
29. 29)
  - 41. Tadic, N., Gobovic, D.: ‘Self-balancing linear bridge circuits with resistive mirrors for resistance measurement’, IEEE Trans. Instrum. Meas., 2000, 49, pp. 1318–1325 (doi: 10.1109/19.893277).
30. 30)
  - 54. Islam, T., Khan, A.-U., Akhtar, J.: ‘Accuracy analysis of oscillator-based active bridge circuit for linearly converting resistance to frequency’. Proc. IEEE Int. Conf. on Multimedia, Signal Processing and Communication Technologies (IMPACT), Aligarh – Uttar Pradesh, India, November 2013, pp. 305–309.
31. 31)
  - 14. Barrettino, D., Graf, M., Taschini, S., Haﬁzovic, S., Hagleitner, C., Hierlemann, A.: ‘CMOS monolithic metal-oxide gas sensor microsystems’, IEEE Sens. J., 2006, 6, pp. 276–286 (doi: 10.1109/JSEN.2006.870156).
32. 32)
  - 17. De Marcellis, A., Ferri, G., Mantenuto, P.: ‘A novel uncalibrated read-out circuit for floating capacitive and grounded/floating resistive sensor measurement’. Proc. Eurosensors XXVI, Cracow, Poland, September 2012, pp. 253–256.
33. 33)
  - 53. Wang, Y., Chodavarapu, V.-P.: ‘Design of CMOS capacitance to frequency converter for high-temperature MEMS sensors’. Proc. IEEE Sensors, Baltimore, USA, November 2013, pp. 1–4.
34. 34)
  - 5. De Marcellis, A., Depari, A., Ferri, G., et al: ‘A CMOS integrable oscillator-based front end for high-dynamic-range resistive sensors’, IEEE Trans. Instrum. Meas., 2008, 57, pp. 1596–1604 (doi: 10.1109/TIM.2008.922075).
35. 35)
  - 40. Yonce, D.J., Bey, P.P.J., Fare, T.L.: ‘A DC autonulling bridge for real-time resistance measurement’, IEEE Trans. Circuits Syst. I, Fundam. Theory Appl., 2000, 42, pp. 273–278 (doi: 10.1109/81.841910).
36. 36)
  - 10. Azarmehr, M., Rashidzadeh, R., Ahmadi, M.: ‘Low-power oscillator for passive radio frequency identification transponders’, IET Circuits Devices Syst., 2012, 6, pp. 79–84 (doi: 10.1049/iet-cds.2011.0279).
37. 37)
  - 45. Senani, R.: ‘Linear resistance-to-frequency conversion employing integrated circuit operational amplifiers’, Int. J. Electron., 1981, 50, pp. 485–491 (doi: 10.1080/00207218108901289).
38. 38)
  - 25. Bhattacharyya, P., Basu, P.K., Saha, H., Basu, S.: ‘Fast response methane sensor based on Pd(Ag)/ZnO/Zn MIM structure’, IEEE Sens. Lett., 2006, 4, pp. 371–376 (doi: 10.1166/sl.2006.050).
39. 39)
  - 20. Zimmermann, M., Volden, T., Kirstein, K.U., et al: ‘A CMOS-based integrated-system architecture for a static cantilever array’, Sens. Actuators B, 2008, 134, pp. 254–264 (doi: 10.1016/j.snb.2007.11.016).
40. 40)
  - 3. Daliri, M., Maymandi-Nejad, M.: ‘Analytical model for CMOS cross-coupled LC-tank oscillator’, IET Circuits Devices Syst., 2014, 8, pp. 1–9 (doi: 10.1049/iet-cds.2013.0087).
41. 41)
  - 35. Mantenuto, P., De Marcellis, A., Ferri, G.: ‘Uncalibrated analog bridge-based interface for wide-range resistive sensor estimation’, IEEE Sens. J., 2012, 12, pp. 1413–1414 (doi: 10.1109/JSEN.2011.2172414).
42. 42)
  - 30. Radosavljevic, G., Pochia, M.M., Rosca, D., Blaž, N., Maric, A.: ‘Capacitive low temperature Co-fired ceramic fluidic sensor’, Sens. Lett., 2013, 11, pp. 646–649 (doi: 10.1166/sl.2013.2933).
43. 43)
  - 31. De Marcellis, A., Depari, A., Ferri, G., Flammini, A., Sisinni, E.: ‘A CMOS integrated low-voltage low-power time-controlled interface for chemical resistive sensors’, Sens. Actuators B, 2013, 179, pp. 313–318 (doi: 10.1016/j.snb.2012.09.104).
44. 44)
  - 19. De Marcellis, A., Ferri, G., Mantenuto, P.: ‘A novel OA-based oscillating circuit for uncalibrated capacitive and resistive sensor interfacing applications’. Proc. IMCS, Nuremberg, Germany, May 2012, pp. 1707–1709.
45. 45)
  - 26. Daungdaw, S., Prangsri-Aroon, S., Viravathana, P., Wongchaisuwat, A., Eamchotchawalit, C.: ‘LaCoO3 perovskites for CO sensing’, Sens. Lett., 2013, 11, pp. 556–559 (doi: 10.1166/sl.2013.2745).
46. 46)
  - 38. Van der Goes, F.M.L., Meijer, G.C.M.: ‘A simple accurate bridge-transducer interface with continuous autocalibration’, IEEE Trans. Instrum. Meas., 1997, 46, pp. 704–710 (doi: 10.1109/19.585437).
47. 47)
  - 46. Senani, R.: ‘On linear inductance-time and related conversions using IC op amps’, IEEE Trans. Ind. Electron., 1987, IE-34, pp. 292–293 (doi: 10.1109/TIE.1987.350968).
48. 48)
  - 34. Jayaraman, B., Bath, N.: ‘High precision 16 bit readout gas sensor interface in 0.13 μm CMOS’. Proc. IEEE ISCAS, New Orleans, USA, May 2007, pp. 3071–3074.
49. 49)
  - 6. Depari, A., Flammini, A., Marioli, D., et al: ‘Uncalibrated integrable wide-range single-supply portable interface for resistance and parasitic capacitance estimation’, Sens. Actuators B, 2008, 132, pp. 477–484 (doi: 10.1016/j.snb.2007.10.068).
50. 50)
  - 4. Moradzadeh, H., Azhari, S.J.: ‘Low-voltage low-power rail-to-rail low-Rx wideband second generation current conveyor and a single resistance-controlled oscillator based on it’, IET Circuits Devices Syst., 2011, 5, pp. 66–72 (doi: 10.1049/iet-cds.2010.0178).
51. 51)
  - 18. De Marcellis, A., Ferri, G., Mantenuto, P., Depari, A., Flammini, A., Sisinni, E.: ‘A new 0.35 μm CMOS electronic interface for wide range floating capacitive and grounded/floating resistive sensor applications’, Microelectron. J., 2014, 45, pp. 910–920 (doi: 10.1016/j.mejo.2014.03.011).
52. 52)
  - 22. De Marcellis, A., Cubells-Beltrán, M.D., Reig, C., et al: ‘Quasi-digital front-ends for current measurement in integrated circuits with giant magnetoresistance technology’, IET Circuits Devices Syst., 2014, 8, pp. 291–300 (doi: 10.1049/iet-cds.2013.0348).
53. 53)
  - 11. Lu, J.H.L., Inerowicz, M., Sanghoon, J., Jong-Kee, K., Byunghoo, J.: ‘A low-power wide-dynamic-range semi-digital universal sensor readout circuit using pulsewidth modulation’, IEEE Sens. J., 2011, 11, pp. 1134–1144 (doi: 10.1109/JSEN.2010.2085430).
54. 54)
  - 24. Ferri, G., Stornelli, V., De Marcellis, A., Flammini, A., Depari, A.: ‘Novel CMOS fully integrable interface for wide-range resistive sensor arrays with parasitic capacitance estimation’, Sens. Actuators B, 2008, 130, pp. 207–215 (doi: 10.1016/j.snb.2007.08.001).
55. 55)
  - 13. Ferri, G., De Marcellis, A., Di Carlo, C., et al: ‘A single-chip integrated interfacing circuit for wide-range resistive gas sensor arrays’, Sens. Actuators B, 2009, 143, pp. 218–225 (doi: 10.1016/j.snb.2009.09.002).
56. 56)
  - 37. Johnson, C.D., Chen, C.: ‘Bridge-to-computer data acquisition system with feedback nulling’, IEEE Trans. Instrum. Meas., 1990, 39, pp. 531–534 (doi: 10.1109/19.106287).

Uncalibrated operational amplifier-based sensor interface for capacitive/resistive sensor applications

References

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