Fast slewing operational amplifier

Claim 2

A fast slewing operational amplifier comprising: differential amplifier means for providing an output current in response to a differential input voltage said amplifier having a predetermined quiescent current said amplifier having a substantially proportional output characteristic where said output current is substantially related to said voltage input by a constant to provide an output current significantly greater than said quiescent current said differential amplifier also having a substantially constant mutual conductance throughout its range of operation said differential amplifier including two pairs of complementary transistors each having emitter and collector type terminals the terminals of one type being cross-coupled; and integrating means coupled to said differential amplifier means responsive to a change in said output current to provide a corresponding change in output voltage of said integrating means.

Claim 3

A fast slewing operational amplifier as in claim 1 where said integrating means is of the inverting type where a positive change in input current produces a negative voltage change and vice versa.

Claim 4

A fast slewing operational amplifier as in claim 1 where said differential amplifier includes a first pair of transistors of one carrier type for receiving said differential input voltage, a second pair of transistors of the opposite carrier type respectively coupled to said first pair for providing said output current, and means for respectively cross-coupling the emitter terminals of said first traNsistor pair to the emitter terminal of a transistor of said second pair which is coupled to the other end of said first pair of transistors.

Claim 5

A fast slewing operational amplifier as in claim 3 where said cross-coupling means includes resistors.

Claim 6

A fast slewing operational amplifier comprising: differential amplifier means including, a first pair of transistors of one carrier type having a pair of base input terminals for receiving the differential input voltage, a second pair of transistors of the opposite carrier type coupled respectively to said first pair so that conductance of one of said first pair of transistors prevents conduction in the associated one of said second pair of transistors; means for coupling the emitter terminals of said first pair of transistors to the emitter terminals of the unassociated one of said second pair of transistors, conduction in said one of first pair of transistors allowing conduction in the cross-coupled one of said second pair of transistors and the associated one of said second pair of transistors preventing conduction of the cross-coupled one of said first pair of transistors the collector terminals of said second pair of transistors providing an output current, one of such terminals having a series connected inverter to selectively provide an output current of either polarity; and integrating means coupled to said differential amplifier means responsive to a change in said output current to provide a corresponding change in output voltage of said integrating means.

Claim 7

A fast slewing operational amplifier comprising: differential amplifier means including, a first pair of transistors of one carrier type having a pair of base input terminals for receiving the differential input voltage, a second pair of transistors of the opposite carrier type coupled respectively to said first pair so that conductance of one of said first pair of transistors prevents conduction in the associated one of said second pair of transistors; means for coupling the emitter terminals of said first pair of transistors to the emitter terminals of the unassociated one of said second pair of transistors, conduction in said one of first pair of transistors allowing conduction in the cross-coupled one of said second pair of transistors and the associated one of said second pair of transistors preventing conduction of the cross-coupled one of said first pair of transistors the collector terminals of said second pair of transistors providing an output current, one of such terminals having a series connected inverter to selectively provide an output current of either polarity; and integrating means coupled to said differential amplifier means responsive to a change in said output current to provide a corresponding change in output voltage of said integrating means.