Compensation de la tension de decalage du CFOA et applications aux filtres passe-bandes a frequence programmable (French text)

The tendency to develop miniature circuits and with low consumption of energy is in full growth. That is due to the need to improve the electronic performances of devices dedicated to the many applications such as telecommunication, the biomedical and the signal processing, etc.; This project of master concerns:; First, the development and design in technology CMOS of an operational amplifier (ampop) with feedback in current (Current Operational Feedback To Amplify---CFOA) with a circuit of correction of the tension of offset. The compensation circuit is autonomous and generates negligible effects on the characteristics of the CFOA such as: the maximum slope of the output voltage, the bandwidth, the harmonic distortion, gain DC and the consumption of energy. The CFOA and the compensation circuit are integrated on the same substrate.; Finally, the circuit designed in the first part of this work will be to use to conceive and integrate in only one circuit a new architecture of filter in technology CMOS. The band pass filter proposed is characterized by a programmable frequency and the performances: constant step and gain, low level of noise in the targeted bandwidth.; The frequency programming using a digital circuit that is not very sensitive to the errors generated by manufacturing process and characterized by negligible effects on the performance of the filter.; The CFOA with compensation of the tension of offset was manufactured in technology CMOS 0.18mum. The results of simulation and experimental obtained are excellent and prove the originality of the suggested solutions to reduce the tension of offset and to vary the frequency of the band pass filter.