Wideband linear Darlington cascode amplifier

Claim 2

An electrical circuit comprising a first Darlington pair configuration connected to an in-phase input activating node of a first cascoded device and a second Darlington pair configuration connected to an out-of-phase input activating node of a second cascode device, said first Darlington pair configuration and said second Darlington pair configuration being coupled to each other by a resistor.

Claim 3

An electrical circuit as recited in claim 1 additionally comprising a first coupled transformer having an input isolated winding capable of inducing power on an input isolated winding which has a first end connected to said in-phase input activating node and a second end connected to said out-of-phase input activating node.

Claim 4

An electrical circuit as recited in claim 2 which further comprises a first grounded capacitor coupled to said first end of said input connected winding and a second grounded capacitor coupled to said second end of said input connected winding.

Claim 5

An electrical circuit as recited in claim 1 wherein said in-phase input activating node has an R-C feedback circut coupled to a in-phase output node of said first cascoded device and said out-of-phase input activating node is R-C coupled to a out-of-phase output node of said second cascoded device.

Claim 6

An electrical circuit as recited in claim 4 additionally comprising a second coupled transformer having a split winding attached between said in-phase output node and said out-of-phase output node and further having a circuit output transformer winding.

Claim 7

An electrical circuit as recited in claim 5 further comprising means for applying a dc voltage source to said split winding.

Claim 8

An electrical circuit as recited in claim 1 wherein said electrical circuit is a push-pull amplifier.

Claim 9

An electrical circuit as recited in claim 1 wherein said electrical circuit is a power doubling amplifier.

Claim 10

An electrical circuit as recited in claim 1 wherein said first cascoded device is inversely symmetric to said second cascoded device.

Claim 11

A power amplifier circuit comprising: a first Darlington pair including a first transistor and a second transistor each having a base, an emitter, and a collector; a second Darlington pair including a third transistor and a fourth transistor each having a base, an emitter, and a collector; a resistor connecting the emitters of said second and fourth transistors; an input signal source capable of supplying signals of opposite polarity to the bases of said first transistor and said third transistor; an in-phase output transistor cascoded to said first Darlington pair; an out-of-phase output transistor cascoded to said second Darlington pair; and a split winding connecting the collector of said in-phase output transistor to the collector of said out-of-phase output transistor.

Claim 12

A power amplifier circuit comprising: a first Darlington pair including a first transistor and a second transistor each having a base, an emitter, and a collector; a second Darlington pair including a third transistor and a fourth transistor each having a base, an emitter, and a collector; a resistor connecting the emitters of said second and fourth transistors; an input signal source capable of supplying signals of opposite polarity to the bases of said first transistor and said third transistor; an in-phase output transistor cascoded to said first Darlington pair; an out-of-phase output transistor cascoded to said second Darlington pair; and a split winding connecting the collector of said in-phase output transistor to the collector of said out-of-phase output transistor.

Claim 13

A power amplifier circuit as recited in claim 10 wherein said input signal source is a transformer.

Claim 14

A power amplifier circuit as recited in claim 10 wherein said in-phase output transistor cascoded to said first Darlington pair is additionally RC feedback coupled to the base of said first transistor and said out-of-phase output transistor cascoded to said second Darlington pair is additionally RC feedback coupled to the base of said third transistor.

Claim 15

A power amplifier circuit as recited in claim 10 additionally comprising a first grounded resistor attached to the emitter of said first transistor and a second grounded resistor attached to the emitter of said third transistor.

Claim 16

A power amplifier circuit as recited in claim 10 additionally comprising a resistor connecting the emitters of said first and third transistors.

Claim 17

A power amplifier circuit comprising: a first Darlington pair including a first transistor and a second transistor each having a base, an emitter, and a collector; a second Darlington pair including a third transistor and a fourth transistor each having a base, an emitter, and a collector; an input signal source capable of supplying signals of opposite polarity to the bases of said first transistor and said second transistor; at least one capacitor attached to said input signal source; a first resistor coupling the emitter of said second transistor and the emitter of said fourth transistor; a second resistor connected between ground and the emitter of said first transistor; a third resistor connected between ground and the emitter of said third transistor; a fourth resistor coupling the emitter of said first transistor and the emitter of said third transistor; an in-phase output transistor cascoded and R-C feedback coupled to said first Darlington pair, said in-phase output transistor having a base, an emitter, and a collector; an out-of-phase output transistor cascoded and R-C feedback coupled to said second Darlington pair, said out-of-phase output transistor having a base, an emitter, and a collector; a split winding connecting the collector of said in-phase output transistor to the collector of said out-of-phase output transistor; a circuit output transformer winding electrically coupled to said split winding; and means for connecting a dc voltage source, V cc , to said split winding and also to the bases of said first transistor, said third transistor, said inphase output transistor and said out-of-phase output transistors.

Claim 18

A power amplifier circuit comprising: a first Darlington pair including a first transistor and a second transistor each having a base, an emitter, and a collector; a second Darlington pair including a third transistor and a fourth transistor each having a base, an emitter, and a collector; an input signal source capable of supplying signals of opposite polarity to the bases of said first transistor and said second transistor; at least one capacitor attached to said input signal source; a first resistor coupling the emitter of said second transistor and the emitter of said fourth transistor; a second resistor connected between ground and the emitter of said first transistor; a third resistor connected between ground and the emitter of said third transistor; a fourth resistor coupling the emitter of said first transistor and the emitter of said third transistor; an in-phase output transistor cascoded and R-C feedback coupled to said first Darlington pair, said in-phase output transistor having a base, an emitter, and a collector; an out-of-phase output transistor cascoded and R-C feedback coupled to said second Darlington pair, said out-of-phase output transistor having a base, an emitter, and a collector; a split winding connecting the collector of said in-phase output transistor to the collector of said out-of-phase output transistor; a circuit output transformer winding electrically coupled to said split winding; and means for connecting a dc voltage source, V cc , to said split winding and also to the bases of said first transistor, said third transistor, said inphase output transistor and said out-of-phase output transistors.