Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1994-05-13
1996-02-13
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330258, 330303, 330305, 330306, H03F 345
Patent
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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Goetschel Christian J.
Greene Robert A.
Kertis Robert A.
Philpott Rick A.
Richetta Raymond A.
Anglin J. Michael
International Business Machines - Corporation
Mullins James B.
Pennington Joan
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