US4338573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Output amplifier with non-linear negative feedback
Assignee: US Philips Corp
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Filing: 1980-03-19
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Granted: 1982-07-06
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Expires: 2000-03-19
Abstract
Abstract Short-circuit protection of the load of an output amplifier by means of a non-linear coupling between the output and a d.c. bias point of the amplifier.
Inventors
- 👤 Martinus J. van den Bungelaar
- 👤 Albert Stoker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:32
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3081; H03F1/00; H03F1/52; H03F2200/00; H03F2200/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A circuit arrangement comprising: a first amplifier, a second amplifier, said amplifiers having a common input and being operated in push-pull, a load impedance being switchable between the outputs of said amplifiers, a first direct-current passing circuit being included between the output of the first amplifier and a first d.c. bias point of the second amplifier, and a second direct-current passing circuit being included between the output of the second amplifier and a second d.c. bias point of the first amplifier, whereby the resulting d.c. coupling from the output of the first amplifier to the output of the second amplifier and from the output of the second amplifier to the output of the first amplifier is non-inverting, and each of the direct-current passing circuits includes a non-linear current-passing element.
Claim 2
Dependent Claim
129 words
A circuit arrangement comprising: a first amplifier, a second amplifier, said amplifiers having a common input and being operated in push-pull, a load impedance being switchable between the outputs of said amplifiers, a first direct-current passing circuit being included between the output of the first amplifier and a first d.c. bias point of the second amplifier, and a second direct-current passing circuit being included between the output of the second amplifier and a second d.c. bias point of the first amplifier, whereby the resulting d.c. coupling from the output of the first amplifier to the output of the second amplifier and from the output of the second amplifier to the output of the first amplifier is non-inverting, and each of the direct-current passing circuits includes a non-linear current-passing element.
Claim 3
Dependent Claim
20 words
A circuit arrangement as claimed in claim 1, wherein said non-linear current passing element takes the form of a rectifier.
Claim 4
Dependent Claim
23 words
A circuit arrangement as claimed in claim 1 or 2, wherein said non-linear current-passing element is constituted by two rectifiers connected in anti-parallel.
Claim 5
Dependent Claim
18 words
A circuit arrangement as claimed in claim 1, wherein each of the direct-current passing circuits comprises a resistor.
Claim 6
Dependent Claim
27 words
A circuit arrangement as claimed in claim 4, wherein said direct-current passing circuits are connected to a d.c. bias point which is common to the two amplifiers.
Claim 7
Dependent Claim
55 words
A circuit arrangement as claimed in claim 5, wherein said current passing element for each of the direct-current passing circuits is constituted by a single direct-current passing element which is common to the two direct-current passing circuits and the resistors are included between the outputs of the two amplifiers and said common direct-current passing element.
Claim 8
Dependent Claim
16 words
A circuit arrangement as claimed in claim 4, wherein said the resistors have equal resistance values.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |