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US 4,442,409 AGranted
Push-pull non-complementary transistor amplifier
AssigneeRCA Corporation
InventorDonald R. Preslar
Life of this patent
Estimating the term…
Abstract
A push-pull amplifier having like conductivity output transistors is driven by a phase-splitter transistor amplifier. The collector load of the phase-splitter includes a diode bridge for establishing the amplifier idling current. One arm of the bridge incorporates the pull-up output transistor base-emitter junction-the current conducted therein being accurately determined by bridge parameters.
Claims13
A push pull amplifier comprising:
- first and second terminals for supplying relatively positive and relatively negative supply potential respectively;
- first and second current sources for supplying and sinking substantially equal currents;
- first, second and third transistors of like conductivity type each having respective first and second electrodes, a principal conduction path therebetween, and having respective control electrode and wherein said principal conduction paths are controlled by respective potentials applied across their respective first and control electrodes;
- a bridge circuit including first and second parallel connected arms, a first arm of which includes a plurality N of serially connected diode means and a second arm of which includes a series connection of the control and first electrodes of said second transistor and at least one diode means, the total number of series connected elements in the second bridge arm totaling N and wherein said at least one diode means is connected between the first electrode of the second transistor and the first bridge arm;
- means serially connecting the first and second current sources, the bridge circuit and the principal conduction path of the first transistor between said first and second terminals with the first and second current sources most near to the first and second terminals respectively;
- a current mirror amplifier having an input electrode connected to the first terminal of the first transistor and having an output terminal connected to the interconnection of the first electrode of said second transistor and said at least one diode means, said current mirror including said third transistor with its principal conduction path serially connected with the current mirror output terminal for determining its output current and wherein output signal is available from said push-pull amplifier from the first electrode of said second transistor.
3 more elements
A push-pull amplifier comprising:
- first and second transistors of a like conducitivity type, and a third transistor, each transistor having first, second and control electrodes and having a principal conduction path between its first and second electrodes controlled by a potential between its control and first electrode;
- first and second current sources;
- a bridge circuit including a like number greater than one of current dependent potential offset means in each of two arms, the bridge arms terminating in first and second common ends, one of said arms serially including the control and first electrodes of said first transistor with the first electrode of said first transistor remote from said first and second common ends;
- means for serially connecting the first current source, the bridge circuit the second and first electrodes of the third transistor and the second current source in the recited order;
- means for connecting the control and second electrodes of the second transistor to the respective first electrodes of the third and first transistors respectively;
- and
- means for connecting the control and first electrodes of the second transistor across said second current source.
4 more elements
A push-pull amplifier comprising:
- first and second bipolar transistors of a first conductivity type and a bipolar driver transistor, each having collector, base and emitter electrodes;
- first and second constant current sources for sourcing and sinking equal currents, said first and second current sources connected as collector and emitter loads respectively for said driver transistor;
- a bridge circuit connected between the first current source and the driver transistor collector electrode, said bridge circuit having a plurality N of pn junctions in a first arm thereof and a plurality N of pn junctions in a second arm thereof one of which being the base-emitter junction of the first transistor, there being at least one pn junction in said second arm interposed between the emitter electrode of the first transistor and the collector electrode of the driver transistor;
- means for connecting the collector and base electrodes of the second transistor to the emitter electrodes of the first and driver transistors respectively;
- potential supply means connected for conditioning the first and second transistors for normal operation;
- and
- wherein input signal potential is applied to the base electrode of the driver transistor and output signal is available at the emitter electrode of the first transistor.
4 more elements
Dependencies are inferred from the claim text.