Method to dynamically control the quiescent current of an...

Details Method to dynamically control the quiescent current of an... Method to dynamically control the quiescent current of an...

2006-03-28

2006-03-28

Nguyen, Khanh V. (Department: 2817)

Amplifiers

Sum and difference amplifiers

C330S252000

Reexamination Certificate

active

07019588

ABSTRACT:
A method for controlling the quiescent output current of an operational amplifier arrangement by tuning offset voltages of a stage preceding a differential output driver stage. The cut-off frequency of the filter formed by the input capacitors of the differential output driver stage and the output impedance of the stage preceding the differential output driver stage is selected so that the cut-off frequency is lower than a predetermined part of the maximum bandwidth of the input signal (vin) applied to the operational amplifier arrangement. The stage preceding the differential output driver stage is designed to be limited in output swing. The invention relates as well to an operational amplifier designed in accordance with the subject methodology.

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Casier H et al.: “A 3.3-V, Low-Distortion ISDN Line Driver with a Novel Quiescent Current Control Circuit” IEEE Journal of Solid-State Circuits, IEEE Inc., New York, US, vol. 33, No. 7, Jul. 1998, pp. 1130-1133, XP000849173.

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