Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Patent
1995-05-24
1997-08-12
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
327563, 327108, 327427, 327379, 327 89, H03K 17687
Patent
active
056569696
ABSTRACT:
Power consumption by the driving circuitry of an output stage, employing a slew-rate controlling operational amplifier, is reduced by modulating the level of the current output by the operational amplifier in function of the working conditions of the output stage. Switching delay may also be effectively reduced. An auxiliary current generator forces an additional current through the conducting one of the pair of input transistors of the operational amplifier only during initial and final phases of a transition, essentially when the slew rate control loop ceases to be effective. The boosting of the bias current through the conducting input transistor is determined by the degree of unbalance of the differential input stage of the operational amplifier, without the use of dissipative sensing elements.
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Bontempo Gregorio
Gariboldi Roberto
Pulvirenti Francesco
Callahan Timothy P.
Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno
SGS--Thomson Microelectronics S.r.l.
Shin Eunja
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