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This paper describes the design of a Sensor Signal Conditioner for a pressure sensor transducer in automotive applications. The circuit has been implemented in a 0.35 um CMOS process and comprises an Instrumentation Amplifier (IA), a 2nd order Chebyshev active low pass filter and an 1st order incremental ADC. The IA consumes 3mA with a supply voltage of 5V. Measured gain is 30 dB with 10° of phase...
In this paper, a MEMS capacitive pressure sensor and a capacitance to digital converter are presented. The MEMS transducer has been designed and fabricated using MetalMUMPs process from MEMSCAP. For an diaphragm area of 600×600 μm2 and an electrostatic pressure variation up to 30 kPa, the MEMS exhibits a capacitance change from 9.3 pF to 13.4 pF, with a INL of 0.2% A capacitance to digital converter...
There is a strong motivation for the development of low-power RFID sensors tags. In this work, a full passive RFID pressure sensor tag is presented paying special attention to a time to digital converter based on nonius oscillators. The circuit has been designed using a 90nm CMOS standard process. Post-layout simulations show that the nonius converter allows the estimation of the input pulse width...
There is a strong motivation for the development of new low power sensors for wireless passive applications such as RFID. In this work, a combination of a MEMS capacitive pressure transducer and a capacitive to digital converter compatible with a sensor enabled RFID tag are presented. The MEMS transducer has been designed and fabricated using a MetalMUMPs process. Its characterization showed an output...
A novel wireless temperature monitoring system for electric machines is presented based on fully passive UHF RFID sensor tags. The system is composed of a custom designed IC UHF RFID sensor tag connected to an external μP and ADC through a master-slave series-peripheral interface (SPI) connection. The sensing element is a NTC 10kOhm thermal resistor (−40° to 300°C). The sensor tag, which includes...
This work presents a full passive UHF RFID pressure sensor tag which uses a nonius based TDC capacitive sensor interface. The proposed converter has a fully digital output and allows reducing power consumption while maintaining the required resolution. The nonius based TDC has been designed using TSMC 90nm standard CMOS technology. Post-layout simulations show that the converter presents a 12 bit...
This paper presents a low power voltage limiter design for avoiding possible damages in the analog front-end of a RFID sensor due to voltage surges whenever readers and tags are close. The proposed voltage limiter design takes advantage of the implemented bandgap reference and voltage regulator blocks in order to provide low deviation of the limiting voltage due to temperature variation and process...
This paper presents a low power voltage limiter design that avoids possible damages in the circuits of the analog front-end of the RFID sensor due to voltage surges whenever reader and tag are very close. The proposed voltage limiter design takes advantage of the implemented bandgap reference and voltage regulator in order to provide low temperature and process deviation of the limiting voltage. The...
A low-power invasive blood pressure transducer has been designed. It is based on a structure of four high resistive strain gauges in a full Wheatstone bridge configuration. For obtaining the required sensitivity, the gauge was allocated performing a careful mechanical simulation of the membrane behaviour. The electronic conditioning circuit and the ADC were optimized to compensate the noise introduced...
There is a strong motivation for the implementation of electronic identification systems and wireless sensors in hospitals. This work presents a sensor enabled passive RFID tag for patient monitorization. Special attention is paid to the analog FE, which has been designed and implemented in a low cost 0.35 μm CMOS standard process. The proposed front-end architecture allows the implementation of power...
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