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【正文】 inally a D/A converter is used to obtain an analog voltagevalue to control the heater circuit.The digital logic block has been pletely implementedon a FPGA module, in particular XILINX Spartan 3. Differential BlockCondition al Block13bit 13bit13 bit13 bitD/A ConverterK1K2Real TemperatureDesiredTemperatureFig. 19 Conditional differential block6. ConclusionIn this paper, we have presented a high precision temperature control system with integrated sensor interface for widerange resistive gas sensors. The plete system is formedby an analogue subsystem, implemented in CMOS technology, and a digital one. An integrated circuit containing theanalog subblocks has been fabricated. Each internal blockhas firstly tested and then measurements on the pletesystem have been performed verifying all the theoretical andsimulation expectations. Thanks to its good general performance and high stability, the fabricated system has beenproved to be suitable for the measurement and control of thetemperature in a gas sensor array.References1. F. Maloberti and P. Malcovati, “Microsystems and smart sensor interfaces: a review.” AICSP vol. 15, no, 1, pp. 9–26,1998.2. G. Meijer and L. Xiujun, “Smart sensor interface electronics”,Proc. MIEL 2020, vol 1, pp. 67–74, 2020.3. G. Chao。 L. Xiujun and Meijer, “A systemlevel approach for thedesign of smart sensor interfaces.” Proceedings of IEEE Sensors,vol. 1, pp. 210–214, 2020.4. L. Xiujun。 G. Meijer, R. de Boer, and M. van der Lee, “Ahighperformance Universal Sensor Interface.” Proceedings ofIEEE Sensors, vol. 1, pp. 210–214, 2020.5. C. Cantalini, L. Lozzi and S. Santucci, “The parative effect oftwo different annealing temperatures and times on the sensitivityand longterm stability of WO3thin films for detecting NO2”IEEE Sensor Journal, , no. 2, pp 171–179, 2020.6. I. Hotovy, V. Rehacek, P. Siciliano, S. Capone and L. Spiess,“Sensing characteristics of NiO thin films as NO2gas sensor”,Thin Solid Films, vol. 418, pp 9–15, 2020.7. A. Martucci, M. Pasquale, M. Guglielmi, M. Post and . Pivin,“Nanostructured SiO2NiO solgel films with enhanced opticalCO gas sensitivity.” J. American Ceramic Society, vol. 86, no. 9,p. 1638, 2020.8. L. Valentini, C. Cantalini, L. Lozzi, . Kenny, and S. Santucci,“Nanostructured sol–gel silica thin films doped with NiO andSpringerAnalog Integr Circ Sig Process (2020) 47:293–301 301SnO2for gas sensing applications.” Appl. Phys. Letters, vol. 92,pp. 6188–6192, 2020.9. C. Cantalini, L. Valentini, L. Lozzi, . Kenny and S. Santucci,“Sensitivity to NO2and crosssensitivity analysis to NH3, ethanoland humidity of carbon nanotubes thin film prepared by PECVD.”Sensors and Actuators B, vol. 95, pp. 195–202, 2020.10. G. Ferri, N. Guerrini, V. Stornelli, and C. Catalani, “A novelCMOS temperature control system for resistive gas sensor array.”Proc. ECCTD 2020, Cork, Ireland, Aug. 2020.11. G. Ferri, N. Guerrini and V. Stornelli, “A temperature controlsystem for integrated resistive gas sensor arrays.” Proc. SPIE(Microelectronics for the new millennium), Sevilla, May 2020.12. M. Grassi, P. Malcovati, and A. Baschirotto, “A highprecisionwiderange frontend for resistive gas sensor arrays”, Proc.Eurosensors 2020, Rome, Sept. 202013. A. Flammini, D. Marioli, and A. Taroni, “A lowcost interfaceto highvalue resistive sensors varying over a wide range.”Instrumentat Measur. Technology Conference, Vail, CO, USA,pp726–731, 2020.14. C. Cantalini, G. Ferri, N. Guerrini, S. Santucci and V. Stornelli,“Integrated CMOS interface for widerange resistive gas sensors.”Proc. Eurosensors, Barcelona, 2020.15. M. Grassi, P. Malcovati and A. Baschirotto, “A % Accuracy100 Omega1 20MOmega1 Dynamic Range Integrated Gas Sensor InterfaceCircuit with 13 + 4 Bit Digital Output.” Proc. ESSCIRC, Grenoble,France, 2020.16. . Chan and . Chan, “A resistancevariation tolerantconstantpower heating circuit for integrated sensor applications”,IEEE Journal of Solid State Circuits, vol. 34, no. 4, pp. 432–437,1999.17. J. Sun, . Yeong, . Wang, “A low voltage CMOS currentsource with temperature pensation.” Proc. IEEE SSMSD,2020.Giuseppe Ferri is an associate professor inElectronics at the Department of ElectricalEngineering of L’ Aquila University, Ital.In 1993 he has been a visiting researcher atSGSThomson Milano, working in bipolarlowvoltage opamp design. In 199495 hehas been visiting researcher at KU Leuvenworking in lowvoltage CMOS design in thegroup of Prof. Sansen. His research activityis actually centred on the analog designof integrated circuits for portable applications (., sensors andbiomedicals) and circuit theory. He is coauthor of a book entitled“Low Voltage, Low Power CMOS Current Conveyors”, Kluwer ed.(2020) and four textbooks in Italian on Analogue Microelectronics(2020, 2020). Moreover, he is author and coauthor of 74 paperson international and Italian journals and 123 talks at national andinternational conferences.Vincenzo Stornelli was born in Avezzano(AQ), Italy, on May 31, 1980. He received theElectronics Engineering degree (cum laude)in July 2020. In October 2020 he joinedthe Department of Electronic Engineering,University of L’Aquila, where he is actuallyinvolved with problems concerning projectand design of integrated circuits for RFand sensor applications, CAD modelling,characterization, and design analysis ofactive microwave ponents, circuits, and subsystems. He regularlyteaches courses of the European Computer patent and has regularcollaborations with national corporations such as Thales ItaliaSpringer