Operational transconductance amplifier with independent transcon

Amplifiers – With semiconductor amplifying device – Including differential amplifier

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330258, 330303, 330305, 330306, H03F 345

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active

054914477

ABSTRACT:
An integrated biquadratic, continuous-time filter section includes a plurality of operational transconductance amplifiers (OTAs). Simutaneously changing a transconductance (GM) of each of the OTAs is provided by adjusting a differential voltage applied to a plurality of differential transistor pairs of each OTA. Each of the OTAs include a plurality of current sources and a common mode feedback circuit for controlling a common mode output voltage level. Changing the transconductance of the OTA is independent of the common mode voltage level control.

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