An Active-Compensated Double-Integrator Filter Without Matched Operational Amplifiers

All active-compensated double-integrator filters proposed up to now require matched operational amplifiers. This condition is never fully met in practice, resulting in a Q-error that can be large at high-Q and high pole frequencies. A superior double-integrator filter is presented here, which does not require matched operational amplifiers to give error-free Q even under extreme conditions. Copyright © 1980 by the Institute of Electrical and Electronics Engineers, Inc.