US4706038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband linear Darlington cascode amplifier
Assignee: Motorola Solutions Inc
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Filing: 1986-09-29
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Granted: 1987-11-10
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Expires: 2006-09-29
Abstract
Abstract This disclosure relates to a multi-channel power amplifier utilizing Darlington pairs as the inputs of a cascode amplifier. The Darlington pair inputs may implement an added grounded resistor to the emitter of the pre-driver transistor in each Darlington pair. The added resistance allows for individual adjustment of the dc current in the pre-driver transistor of each Darlington pair, as well as an additional discharge path for the charges stored on the base of the driver transistor in each pair during a decreasing current state.
Inventors
- 👤 Salar Navidi
- 👤 Brent L. Trout
- 👤 Fred C. Wernett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:00
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08; H03F1/22; H03F1/32; H03F1/42; H03F3/00; H03F3/189; H03F3/19; H03F3/26
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
58 words
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 2
Dependent Claim
58 words
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
Dependent Claim
51 words
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
Dependent Claim
40 words
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
Dependent Claim
49 words
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
Dependent Claim
37 words
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
Dependent Claim
21 words
An electrical circuit as recited in claim 5 further comprising means for applying a dc voltage source to said split winding.
Claim 8
Dependent Claim
16 words
An electrical circuit as recited in claim 1 wherein said electrical circuit is a push-pull amplifier.
Claim 9
Dependent Claim
17 words
An electrical circuit as recited in claim 1 wherein said electrical circuit is a power doubling amplifier.
Claim 10
Dependent Claim
21 words
An electrical circuit as recited in claim 1 wherein said first cascoded device is inversely symmetric to said second cascoded device.
Claim 11
Dependent Claim
120 words
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
Dependent Claim
120 words
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
Dependent Claim
17 words
A power amplifier circuit as recited in claim 10 wherein said input signal source is a transformer.
Claim 14
Dependent Claim
55 words
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
Dependent Claim
36 words
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
Dependent Claim
22 words
A power amplifier circuit as recited in claim 10 additionally comprising a resistor connecting the emitters of said first and third transistors.
Claim 17
Dependent Claim
257 words
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
Dependent Claim
257 words
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.
References Cited (Backward Citations)
US3486126A
Cited
GB1290255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |