US5166819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Front end for a broadband optical receiver
Assignee: Alcatel Lucent NV
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Filing: 1990-02-20
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Granted: 1992-11-24
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Expires: 2010-02-20
Abstract
Abstract A front end for a broadband optical receiver is disclosed which includes a monolithic integrated Darlington circuit with bipolar transistors (T1, T2). This Darlington circuit is a simple integrated amplifier (OP) developed for UHF application in the range between 0 and 2 GHz. By connecting a suitable transimpedance resistor (R T ) across the Darlington circuit, an improvement in linearity is obtained such that the Darlington circuit can be used together with an avalanche photodiode (APD) in the 0- to 5-GHz frequency range, and together with PIN diodes in short-and medium-length optical tansmission links.
Inventors
- 👤 Manfred Eichel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:30
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/693; H04B10/6932; H03; H03F; H03F3/00; H03F3/04; H03F3/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
81 words
Front end for a broadband optical receiver, comprising a light detector, a monolithic integrated preamplifier circuit following said light detector and constructed from at least two Darlington-connected bipolar transistors with a control electrode of the first Darlington-connected bipolar transistor functioning as a preamplifier input and an output electrode of the last Darlington-connected bipolar transistor functioning as a preamplifier output, and a transimpedance resistor having a value between 100 ohms and 1500 ohms coupled between said preamplifier input and said preamplifier output.
Claim 2
Dependent Claim
81 words
Front end for a broadband optical receiver, comprising a light detector, a monolithic integrated preamplifier circuit following said light detector and constructed from at least two Darlington-connected bipolar transistors with a control electrode of the first Darlington-connected bipolar transistor functioning as a preamplifier input and an output electrode of the last Darlington-connected bipolar transistor functioning as a preamplifier output, and a transimpedance resistor having a value between 100 ohms and 1500 ohms coupled between said preamplifier input and said preamplifier output.
Claim 3
Dependent Claim
23 words
A front end as claimed in claim 1 wherein said transimpedance resistor is capacitively coupled between said preamplifier input and said preamplifier output.
Claim 4
Dependent Claim
26 words
A front end as claimed in claim 1 wherein the light detector is a diode having an anode connected directly to the input of the preamplifier.
Claim 5
Dependent Claim
33 words
A front end as claimed in claim 1, wherein the light detector is a diode having an anode capacitively coupled to the input of the preamplifier, said anode being grounded through a resistor.
Claim 6
Dependent Claim
45 words
A front end as claimed in claim 1 wherein the light detector is a diode having an anode which is grounded, and a cathode which is capacitively coupled to the input of the preamplifier, said cathode being connected through a resistor to a supply voltage.
Claim 7
Dependent Claim
16 words
A front end as claimed in claim 1 wherein the light detector is an avalanche photodiode.
Claim 8
Dependent Claim
16 words
A front end as claimed in claim 1 wherein the light detector is a PIN diode.
Claim 9
Dependent Claim
22 words
A front end as claimed in claim 1 wherein said transimpedance resistor is a low-valued resistance not substantially greater than 750 ohms.
Claim 10
Dependent Claim
18 words
A front end as claimed in claim 8 wherein said low-valued resistance is substantially equal to 750 ohms.
Claim 11
Dependent Claim
113 words
Front end for a broadband optical receiver, comprising a light detector, a monolithic integrated preamplifier circuit following said light detector and constructed from at least two Darlington-connected bipolar transistors with a control electrode of the first Darlington-connected bipolar transistor functioning as a preamplifier input and an output electrode of the last Darlington-connected bipolar transistor functioning as a preamplifier output, a voltage divider network for setting the operating point of the integrated preamplifier including a voltage divider resistance directly coupled between the preamplifier input and the preamplifier output, and transimpedance resistor having a value substantially smaller than that of the voltage divider resistance and capacitively coupled between said preamplifier input and said preamplifier output.
Claim 12
Dependent Claim
113 words
Front end for a broadband optical receiver, comprising a light detector, a monolithic integrated preamplifier circuit following said light detector and constructed from at least two Darlington-connected bipolar transistors with a control electrode of the first Darlington-connected bipolar transistor functioning as a preamplifier input and an output electrode of the last Darlington-connected bipolar transistor functioning as a preamplifier output, a voltage divider network for setting the operating point of the integrated preamplifier including a voltage divider resistance directly coupled between the preamplifier input and the preamplifier output, and transimpedance resistor having a value substantially smaller than that of the voltage divider resistance and capacitively coupled between said preamplifier input and said preamplifier output.
Claim 13
Dependent Claim
35 words
A front end as claimed in claim 10 wherein said voltage divider resistance has a value on the order of 10 kohms and said transimpedance resistor has a value between 100 ohms and 1500 ohms.
Claim 14
Dependent Claim
21 words
A front end as claimed in claim 11 wherein said transimpedance resistor has a value on the order of 750 ohms.
Claim 15
Dependent Claim
31 words
A front end as claimed in claim 10 wherein the ratio of the value of said transimpedance resistor relative to that of said voltage divider resistance is between 1/100 and 15/100.
References Cited (Backward Citations)
US3902060A
Cited
US4074127A
Cited
JPS5434791A
Cited
US4567446A
Cited
EP0129305A2
Cited
EP0181146A2
Cited
US4792998A
Cited
US4792997A
Cited
EP0262728A1
Cited
AU3264989A
Cited
US4939476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-24 | 1996-05-25 | 1996-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-24 | 2000-05-25 | 2000-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-24 | 2004-05-25 | 2004-11-24 | $7700.00 | Window Closed / Lapsed |