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US3566236A
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Amplifier output stage coupling
Assignee: Individual
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Filing: 1968-10-17
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Granted: 1971-02-23
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Expires: 1988-10-17
Abstract
Abstract An amplifier output stage coupling utilizing tetrodes in a pushpull circuit configuration with a transformer output in which the cathodes are coupled into the secondary winding of the transformer and the screen grids are energized through signals controlled by the cathode energization and held to a fixed differential with the cathode.
Inventors
- 👤 William Z Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:32
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/26; H03F3/28; H03F5/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
241 words
An amplifier output stage coupling comprising a first pair of multielement electric amplifying devices connected in a push-pull type of amplification circuit, each of said electric conducting devices having at least a pair of control electrodes and a pair of power electrodes, a double ended input circuit connected respectively to one of the control electrodes of each of said conducting devices, an output transformer having a secondary winding with at least a center tap and a center tapped primary winding circuit, circuit means connecting the center tap of the primary winding to a DC source and the extremities of the said primary winding respectively to one of the power electrodes of each of the electric conducting devices, a second pair of multielement electric conducting devices having at least one control element electrode and two power electrodes, circuit means connecting one of the power electrodes of each of the conducting devices of the second pair to a source of power, additional circuit means connecting the secondary winding of the coupling transformer on either side of the center tap to each of the control elements of the second pair of electric conducting devices respectively and to each of the other of the power electrodes of the first pair of electric conducting devices respectively, and a coupling circuit energizing the other of control electrodes of the first conducting devices from the other of the power elements of the second pair of conducting devices respectively.
Claim 2
Dependent Claim
241 words
An amplifier output stage coupling comprising a first pair of multielement electric amplifying devices connected in a push-pull type of amplification circuit, each of said electric conducting devices having at least a pair of control electrodes and a pair of power electrodes, a double ended input circuit connected respectively to one of the control electrodes of each of said conducting devices, an output transformer having a secondary winding with at least a center tap and a center tapped primary winding circuit, circuit means connecting the center tap of the primary winding to a DC source and the extremities of the said primary winding respectively to one of the power electrodes of each of the electric conducting devices, a second pair of multielement electric conducting devices having at least one control element electrode and two power electrodes, circuit means connecting one of the power electrodes of each of the conducting devices of the second pair to a source of power, additional circuit means connecting the secondary winding of the coupling transformer on either side of the center tap to each of the control elements of the second pair of electric conducting devices respectively and to each of the other of the power electrodes of the first pair of electric conducting devices respectively, and a coupling circuit energizing the other of control electrodes of the first conducting devices from the other of the power elements of the second pair of conducting devices respectively.
Claim 3
Dependent Claim
42 words
The amplifier output stage coupling of claim 1 in which the circuit means connecting one of the power electrodes of each of the second pair of electric conducting devices connects said power electrodes in common and to a DC source of power.
Claim 4
Dependent Claim
75 words
The amplifier output stage coupling of claim 1 in which the circuit means connecting the power electrodes of each of the second pair of electric conducting devices connects said power electrodes respectively to the sides of the primary winding of the coupling transformer where the voltage is in-phase with the voltage at the extremity of the secondary winding which is connected to the control element of said respective electric conducting device of said second pair.
Claim 5
Dependent Claim
52 words
The amplifying output stage coupling of claim 1 in which said circuit means connecting the secondary winding of the coupling transformer to said another of the power electrodes of the first pair of conducting devices includes an AC coupling to the control electrodes of the second pair of multielement circuit conducting devices.
Claim 6
Dependent Claim
85 words
The amplIfier output stage coupling of claim 4 in which the first pair of multielement electric conducting devices are tetrodes having cathode, control, screen and plate electrodes, respectively, and in which the plate electrodes are connected to the extremities to the primary winding of the coupling transformer and the cathode electrodes are connected in a coupling circuit to the secondary winding of the coupling transformer with the screen electrodes being connected to the other of the power elements of the second pair of conducting devices.
Claim 7
Dependent Claim
48 words
The amplifier output stage coupling of claim 5 in which the second pair of multielement electric conducting devices are triode connected in a cathode follower type circuit with the cathodes of the triodes energizing the screen electrodes of the tetrodes forming the first pair of electric conducting devices.
Claim 8
Dependent Claim
61 words
The amplifier output stage coupling of claim 5 in which the second pair of multielement electric conducting devices are NPN type transistors with the base electrodes of each pair being energized from the cathodes of the tetrodes and with an emitter of each pair being connected to the screen electrodes of the tetrodes forming the first pair of electric conducting devices.
Claim 9
Dependent Claim
101 words
The amplifier output stage coupling of claim 5 in which the second pair of multielement electric conducting devices are field effect transistors in which the gate electrodes of the respective second pair of electric conducting devices are connected to and energized from the cathodes of the tetrodes and in which the source electrodes of the field effect transistors are connected to the screen electrodes of the tetrodes forming the first pair of electric conducting devices to energize the screen electrodes at a voltage level which remains fixed with respect to the cathodes as the cathode voltage varies about a fixed difference.
Claim 10
Dependent Claim
96 words
The amplifier output stage coupling of claim 5 in which the second pair of multielement electric conducting devices are each at least two semiconducting devices directly coupled with the base electrodes of one transistor being connected to and energized from the cathodes of the tetrodes forming the first pair of multielement electric conducting devices and in which an emitter electrode of another of the transistors is connected to the screen electrode of the tetrode to energize the screen electrode at a voltage level which is maintained at a fixed differential with the energization of the cathode.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |