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US4939475A
Expired / Lapsed
US
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Circuit arrangement comprising an amplifier connected to an opto-electrical transducer
Assignee: Siemens AG
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Filing: 1989-09-15
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Granted: 1990-07-03
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Expires: 2009-09-15
Abstract
Abstract A circuit arrangement comprises an amplifier that has an input connected to an opto-electrical transducer and a gain which is controllable with the assistance of a control voltage. In order to achieve a great dynamic range given a constant operating point of the amplifier, the drain-source path of a field effect transistor, a feedback path includes a capacitor, and the input of the amplifier is connected to the output of a comparator that compares the output voltage of the amplifier to a reference voltage. The circuit arrangement can be advantageously employed in optical transmission equipment of PCM technology.
Inventors
- 👤 Karl-Heinz Prasse
- 👤 Hermann Danzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:41
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/08; H03F3/087; H03F3/082; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/007; H03G3/00; H03G3/20; H03G3/30; H03G3/3084; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/693
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
108 words
A circuit arrangement comprising: an amplifier including an input and an output and having a gain which is controllable with the assistance of a control element that modifies its load resistance; an opto-electrical transducer connected to said input; a feedback circuit, including a capacitor, connected between said output and said input; a field effect transistor including a drain, a source, and a gate, and a drain-source path connected in parallel with said input of said amplifier; and a comparator including a first input connected to said output of said amplifier, a second input connected to a reference potential, and an output connected to said input of said amplifier.
Claim 2
Dependent Claim
108 words
A circuit arrangement comprising: an amplifier including an input and an output and having a gain which is controllable with the assistance of a control element that modifies its load resistance; an opto-electrical transducer connected to said input; a feedback circuit, including a capacitor, connected between said output and said input; a field effect transistor including a drain, a source, and a gate, and a drain-source path connected in parallel with said input of said amplifier; and a comparator including a first input connected to said output of said amplifier, a second input connected to a reference potential, and an output connected to said input of said amplifier.
Claim 3
Dependent Claim
44 words
The circuit arrangement of claim 1, and further comprising: a first resistor connected between said output of said comparator and said input of said amplifier; and a second resistor connected between said output of said comparator and said source of said field effect transistor.
Claim 4
Dependent Claim
21 words
The circuit arrangement of claim 2, wherein: said feedback circuit comprises a series circuit including said capacitor and a third resistor.
Claim 5
Dependent Claim
26 words
The circuit arrangement of claim 3, wherein: said first resistor is connected to said input of said amplifier via said third resistor of said feedback circuit.
References Cited (Backward Citations)
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GB2105543A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |