Sensor system with wireless data communication

The core of the project is the design, construction of and results obtained with a wireless measuring system using a passive integrated resonance circuit. The system is intended for measurement of small pressure variations and wireless information transmission. It is based on the principle of variation of the resonance frequency of a single-chip integrated timed circuit with measuring capacitance. The one-chip resonant circuit has been realised as a monolith integrated sensor in CMOS technology. The dimension is approximately 10 mm/sup 2/. The active part has the form of an absorption resonance frequency meter. Measurement, control, approximation, computation and result processing are performed on a PC. The paper deals with the theory of system design, electronic circuit connections, parasitic capacitances effects calculation, fabrication technology of the integrated passive resonant circuit, result evaluation and techniques of the PC-controlled absorption meter.