Title :
Frequency limitations of continuous-time OTA-C filters
Author :
Nevárez-Lozano, Horacio ; Hill, J. Andrew ; Sánchez-Sinencio, Edgar
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
Nonidealities, including high-frequency parasitics, of real CMOS operation transconductance amplifiers (OTAs) are considered in order to determine the frequency performance limitations in OTA-C (OTA and capacitor) filters. In particular, a second-order circuit is analyzed in depth to demonstrate the frequency limitations of practical monolithic two-integrator loop OTA-C filter structures. A test filter constructed using a 3-μm CMOS process is presented, and the experimental and theoretical results are discussed. It is shown how the OTA-C filter limitations depend upon the nonidealities of the OTA and the filter architecture
Keywords :
CMOS integrated circuits; active filters; linear integrated circuits; 3 micron; CMOS operation transconductance amplifiers; continuous-time OTA-C filters; filter architecture; frequency performance limitations; high-frequency parasitics; monolithic two-integrator loop OTA-C filter structures; nonidealities; second-order circuit; test filter; Circuit analysis; Circuit testing; Equations; Filters; Frequency; Impedance; Operational amplifiers; Parasitic capacitance; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo
DOI :
10.1109/ISCAS.1988.15373
