Full CMOS continuous time filters for GSM applications
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This paper describes full cmos continuous time filter design techniques which can meet the specifications commonly set for gsm applications. First several cmos filter design techniques are overviewed. The ota-c technique is discussed to some more detail. To overcome the main drawback of the lower total harmonic distortion in ota-c techniques very linear operational transconductance amplifiers (ota)are required. Such an ota, together with the applied linearisation techniques is discussed. To fulfil high accuracy in cut- off frequencies of the filter an active tuning system is necessary. A new on- chip tuning system is presented. The paper concludes with a practical design example for the gsm system. Therein the different ota-c techniques discussed are illustrated. 1993 Springer-Verlag.