Patent US4609880A successfully refreshed from Google Patents.
US4609880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad-band amplifier for the amplification of a photoelectric current
Assignee: Telefunken Electronic GmbH
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Filing: 1984-09-28
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Granted: 1986-09-02
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Expires: 2004-09-28
Abstract
Abstract A broad-band amplifier for the amplification of a photoelectric current triggered by a light signal, including a first transistor connected to receive the photoelectric current, a second transistor connected in series with the first one, a resistance connected between the base of the first transistor and the emitter of the second transistor, a third transistor and a fourth transistor which form a current mirror, the third transistor being connected in series with the second transistor, and a resistance located between the third transistor and ground.
Inventors
- 👤 Stephan Dermitzakis
- 👤 Jasbeer S. Suri
- 👤 Gerhard Krumrein
- 👤 Peter Mischel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:19
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/08; H03F3/34; H03F3/343
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
94 words
A broad-band amplifier for the amplification of a photoelectric current triggered by a light signal with a first transistor connected to receive the photoelectric current, and a second transistor connected in series with the first transistor, wherein a resistance is connected between the base of the first transistor and the emitter of the second transistor, and a third transistor and a fourth transistor are provided which form a current mirror, in that the third transistor is connected in series with the second transistor, and a resistance is located between the third transistor and ground.
Claim 2
Dependent Claim
94 words
A broad-band amplifier for the amplification of a photoelectric current triggered by a light signal with a first transistor connected to receive the photoelectric current, and a second transistor connected in series with the first transistor, wherein a resistance is connected between the base of the first transistor and the emitter of the second transistor, and a third transistor and a fourth transistor are provided which form a current mirror, in that the third transistor is connected in series with the second transistor, and a resistance is located between the third transistor and ground.
Claim 3
Dependent Claim
16 words
A broad-band amplifier according to claim 1, wherein the third transistor is connected as a diode.
Claim 4
Dependent Claim
51 words
A broad-band amplifier according to claim 1 wherein the resistance ratio of the resistance located between the base of the first transistor and the emitter of the second transistor to the resistance located between the third transistor and ground is selected such that the broad-band amplifier has a certain current amplification.
Claim 5
Dependent Claim
29 words
A broad-band amplifier according to claim 1, wherein a fifth transistor is provided and is connected with the third transistor and the fourth transistor to form a Schmitt trigger.
Claim 6
Dependent Claim
26 words
A broad-band amplifier according to claim 4, wherein the emitter of the fifth transistor is coupled with the emitter of the fourth transistor via a resistance.
Claim 7
Dependent Claim
17 words
A broad-band amplifier according to claim 4, wherein a sixth transistor is provided as an output transistor.
Claim 8
Dependent Claim
23 words
A broad-band amplifier according to claim 6, wherein the base of the sixth transistor is connected to the emitter of the fifth transistor.
Claim 9
Dependent Claim
23 words
A broad-band amplifier according to claim 6, wherein the base of the sixth transistor is connected to the collector of the fifth transistor.
Claim 10
Dependent Claim
20 words
A broad-band amplifier according to 6, wherein a seventh transistor is provided as output transistor with an open collector output.
Claim 11
Dependent Claim
20 words
A broad-band amplifier according to 6, wherein a seventh transistor is provided as output transistor with an open collector output.
Claim 12
Dependent Claim
21 words
A broad-band amplifier according to claim 1, wherein a resistance is connected between the emitter of the fourth transistor and ground.
Claim 13
Dependent Claim
28 words
A broad-band amplifier according to claim 1 wherein a fifth transistor is provided, the emitter of the fifth transistor being free and serving as output of the amplifier.
Claim 14
Dependent Claim
31 words
A broad-band amplifier according to claim 1 wherein the base of the first transistor constitutes the amplifier input and is connected to receive the photoelectric current triggered by the light signal.
References Cited (Backward Citations)
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GB1410133A
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US3939434A
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US4351916A
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DE3206915A1
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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) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |