US5047735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
RZ clock recovery circuit with positive-feedback
Assignee: Commscope Connectivity LLC
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Filing: 1990-10-05
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Granted: 1991-09-10
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Expires: 2010-10-05
Abstract
Abstract A clock recovery circuit includes a tuned-tank circuit for receiving RZ data signals, a comparator for converting an analog clock signal produced by the tuned-tank circuit to a digital clock signal, and a positive feedback of the digital clock signal to the tuned-tank circuit for self-regenerating the clock signal.
Inventors
- 👤 Reuben W. Meline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:24
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A tuned-tank clock recovery circuit for RZ data comprising: tuned-tank oscillator means, including input means, for receiving an RZ data input stream, recovering the RZ clock signal, and providing a digital clock signal output; and said oscillator means including positive feedback means for feeding the recovered clock signal back to its input means to provide a self-regenerating clock recover circuit.
Claim 2
Dependent Claim
60 words
A tuned-tank clock recovery circuit for RZ data comprising: tuned-tank oscillator means, including input means, for receiving an RZ data input stream, recovering the RZ clock signal, and providing a digital clock signal output; and said oscillator means including positive feedback means for feeding the recovered clock signal back to its input means to provide a self-regenerating clock recover circuit.
Claim 3
Dependent Claim
40 words
The circuit of claim 1 further wherein the input of the oscillator means includes a high speed CMOS integrated circuit buffer and wherein the recovered clock signal is fed back into a circuit node at the output of said buffer.
Claim 4
Dependent Claim
19 words
The circuit of claim 2 further, wherein the recovered clock signal is fed back using said clock signal output.
Claim 5
Dependent Claim
60 words
A tuned-tank clock recovery circuit for RZ data comprising: a tuned-tank oscillator having an input for RZ data and an analog clock signal output; means for converting the analog clock signal output of the tuned-tank oscillator to a digital clock signal; and means for feeding the digital clock signal back to the oscillator to provide a self-regenerating clock recovery circuit.
Claim 6
Dependent Claim
60 words
A tuned-tank clock recovery circuit for RZ data comprising: a tuned-tank oscillator having an input for RZ data and an analog clock signal output; means for converting the analog clock signal output of the tuned-tank oscillator to a digital clock signal; and means for feeding the digital clock signal back to the oscillator to provide a self-regenerating clock recovery circuit.
Claim 7
Dependent Claim
36 words
The circuit of claim 4 further wherein said input includes a high speed CMOS integrated circuit buffer and wherein said digital clock signal is fed back to a circuit node at the output of said buffer.
Claim 8
Dependent Claim
42 words
The circuit of claim 5 further, wherein said oscillator includes a high impedance current source driving an L-C circuit, and wherein the output of said buffer is connected to drive said current source, and the L-C circuit produces said analog output signal.
Claim 9
Dependent Claim
14 words
The circuit of claim 6 further wherein said means for converting comprises a comparator.
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) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |