Niš, November 4 th – 7 th, M. Sc. Zivko Kokolanski Ph.D. Student

Niš, November 4 th – 7 th, OUTLINE

Niš, November 4 th – 7 th, SIGNAL CONDITIONING A/D SensorOscillator CC Programmable measurement system with A/D converter Programmable measurement system with oscillator Simple, low cost Direct digital interface Wider dynamic range Lower electromagnetic interference CC Relaxation oscillator C ref,R ref Sensor Direct Sensor-to-microcontroller interface ADVANTAGES: Programmable signal cond. circ. Sensor CC

Niš, November 4 th – 7 th, MULTIVIBRATOR

Niš, November 4 th – 7 th, MEASUREMENT UNCERTAINTY

Niš, November 4 th – 7 th, MONOSTABLE MULTIVIBRATOR (555) FAMILY ???

Niš, November 4 th – 7 th, MONOSTABLE MULTIVIBRATOR WITH SINGLE POINT CALIBRATION

Niš, November 4 th – 7 th, SYSTEMATIC ERRORS Offset GainNonlinearity For  R x <1/2LSB The condition limits the measurement range

Niš, November 4 th – 7 th, TRANSFER CHARACTERISTIC

Niš, November 4 th – 7 th, TEMPERATURE VARIATION TEST Rapid temperature rise increased Tx and Tc for 2% Rx decreased 0.2% Single point calibration reduce the temperature effects nearly 10 times

Niš, November 4 th – 7 th, CONCLUSIONS