US4314152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithically integrable semiconductor circuit with an amplifier controlled by a photo diode
Assignee: Siemens AG
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Filing: 1980-01-25
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Granted: 1982-02-02
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Expires: 2000-01-25
Abstract
Abstract Monolithically integrable semiconductor circuit with an amplifier controlled by a photo diode, including a differential amplifier having inverting and noninverting inputs and outputs and a photo diode having a first and a second lead, the first lead of the photo diode being connected in the blocking direction to the inverting input of the differential amplifier, and the noninverting input of the differential amplifier being connected to a reference potential, a coupling resistor connected between the inverting and noninverting inputs of the differential amplifier, a filter circuit and a transistor amplifier being connected in a feedback branch between the noninverting output and the inverting input of the differential amplifier, and the inverting output of the differential amplifier and the second lead of the photo diode being connected to ground.
Inventors
- 👤 Josef Fenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:04
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
Monolithically integrable semiconductor circuit with an amplifier controlled by a photo diode, comprising a differential amplifier having inverting and noninverting inputs and outputs and a photo diode having a first and a second lead, the first lead of said photo diode being connected in the blocking direction to the inverting input of said differential amplifier, and the noninverting input of said differential amplifier being connected to a reference potential, a coupling resistor connected between the inverting and noninverting inputs of said differential amplifier, a filter circuit and a transistor amplifier being connected in a feedback branch between the noninverting output and the inverting input of said differential amplifier, and the inverting output of said differential amplifier and the second lead of said photo diode being connected to ground.
Claim 2
Dependent Claim
128 words
Monolithically integrable semiconductor circuit with an amplifier controlled by a photo diode, comprising a differential amplifier having inverting and noninverting inputs and outputs and a photo diode having a first and a second lead, the first lead of said photo diode being connected in the blocking direction to the inverting input of said differential amplifier, and the noninverting input of said differential amplifier being connected to a reference potential, a coupling resistor connected between the inverting and noninverting inputs of said differential amplifier, a filter circuit and a transistor amplifier being connected in a feedback branch between the noninverting output and the inverting input of said differential amplifier, and the inverting output of said differential amplifier and the second lead of said photo diode being connected to ground.
Claim 3
Dependent Claim
33 words
Circuit according to claim 1 including a resistor connected between the inverting output of said differential amplifier and ground, and a resistor connected between the second lead of said photo diode and ground.
Claim 4
Dependent Claim
37 words
Circuit according to claim 1, wherein said filter circuit causes an attenuation in said feedback branch which is greater than the gain of said differential and transistor amplifiers disposed in said branch, for all useful signal frequencies.
Claim 5
Dependent Claim
13 words
Circuit according to claim 3, wherein said filter circuit is a lowpass filter.
Claim 6
Dependent Claim
13 words
Circuit according to claim 4, wherein said filter is a two-section lowpass filter.
Claim 7
Dependent Claim
23 words
Circuit according to claim 3, wherein said filter circuit is a band rejection filter with a rejection frequency corresponding to the transmission frequency.
Claim 8
Dependent Claim
40 words
Circuit according to claim 1, including an amplifier circuit, the anode of said photo diode being connected to the output of said amplifier circuit and the cathode of said photo diode being connected to the input of said amplifier circuit.
Claim 9
Dependent Claim
165 words
Circuit according to claim 7, wherein said amplifier circuit comprises identical first and second bipolar transistors of a given type, a third bipolar transistor of opposite type to said first and second transistor, a first and second current supply, and a current mirror amplifier, the cathode of said photo diode being connected to the base of said first transistor, the collector of said first transistor being connected to ground, the emitter of said first transistor being connected to said first current supply and to the base of said second transistor, the emitter of said second transistor being connected to said second current supply and to the base of said third transistor, the collector of said third transistor being connected to a control input of said current mirror amplifier, an output of said current mirror amplifier being fed back to the anode of said photo diode, and including a resistor connected between the emitter of said third transistor and the noninverting input of said differential amplifier.
Claim 10
Dependent Claim
79 words
Circuit according to claim 8, including an integrated circuit having a substrate and an epitaxial layer, said epitaxial layer containing said photo diode and having a conduction type opposite to that of said substrate, the emitter of said first transistor being connected antiparallel to said photo diode, having the same conduction type as said substrate, and said integrated circuit having no further pn-junction between the pn-junction intermediate said substrate and epitaxial layer and the pn-junction of said photo diode.
Claim 11
Dependent Claim
27 words
Circuit according to claim 2, wherein said resistor connected between the second lead of said photo diode and ground has a lower resistance than said coupling resistor.
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) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |