US5373152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonance-type optical receiver circuit having a maximum amplifier input controlled by using an amplifier feedback and its method of receiving
Assignee: NEC Corp
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Filing: 1993-01-19
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Granted: 1994-12-13
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Expires: 2013-01-19
Abstract
Abstract The present invention provides a resonance-type optical receiver circuit which keeps predetermined small distortion even when the received light level becomes high. The resonance-type optical receiver circuit varies the resistance value of variable resistance element 80, which is used as a load resistor to optical detector 4, in response to the intensity of output signal 10 of an amplifier. The load resistor varies in response to a variations of the received light level of the optical detector in this manner to keep the input to the amplifier lower than a fixed value.
Inventors
- 👤 Wataru Domon
- 👤 Makoto Shibutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:33
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/697; H04B10/6973; H04B10/691; H04B10/6911
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A method of receiving a light wave of a resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said method comprises the procedure of varying a tuning frequency in response to a signal outputted from said amplifier to keep an input level to said amplifier lower than a fixed value.
Claim 2
Independent Claim
66 words
A method of receiving a light wave of a resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said method comprises the procedure of varying a tuning frequency in response to a signal outputted from said amplifier to keep an input level to said amplifier lower than a fixed value.
Claim 3
Dependent Claim
111 words
A resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said optical receiver circuit comprises a variable capacitance element provided in said tuning circuit and having a capacitance whose value automatically varies in response to a variation of a control voltage, and a control circuit for generating a voltage of the difference between an output voltage of said amplifier and a predetermined reference voltage and outputting said voltage corresponding to said difference voltage as a control voltage to said variable capacitance element to keep an input level to said amplifier lower than a fixed value.
Claim 4
Dependent Claim
111 words
A resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said optical receiver circuit comprises a variable capacitance element provided in said tuning circuit and having a capacitance whose value automatically varies in response to a variation of a control voltage, and a control circuit for generating a voltage of the difference between an output voltage of said amplifier and a predetermined reference voltage and outputting said voltage corresponding to said difference voltage as a control voltage to said variable capacitance element to keep an input level to said amplifier lower than a fixed value.
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) | 1997-12-12 | 1998-06-13 | 1998-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-12 | 2002-06-13 | 2002-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-12 | 2006-06-13 | 2006-12-13 | $7700.00 | Window Closed / Lapsed |