Electronically tunable active filters with operational transconductance amplifiers

The design of voltage- or current-controlled active filters with operational transconductance amplifiers (OTA’s) is much less expensive than with analog multipliers. This paper presents some experimental results on known circuits and a new configuration which allows the electronic control of the absolute bandwidth of a biquad.

Malvar_IEEE_TCAS_82.pdf
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In  IEEE Transactions on Circuits and Systems

Publisher  Institute of Electrical and Electronics Engineers, Inc.
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