US4600896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for limiting jitter transients during switching of phase control signals to an oscillator
Assignee: Siemens Telecomunicazioni SpA
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Filing: 1984-09-25
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Granted: 1986-07-15
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Expires: 2004-09-25
Abstract
Abstract A phase comparator is included with each incoming channel to compare the clock phase of the incoming signal and a local oscillator. The phase comparator of an on-line active unit generates a signal to control the oscillator to maintain its output in phase with the incoming signal. The generated control signal is also connected to capacitor storage in associated channel phase comparators to provide them with an initial starting control voltage when they are switched in to be the receiving channels. Thus eliminating the uncontrolled operation of the oscillator during switching interval.
Inventors
- 👤 Giuliano Cellerino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:27
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/22; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/085; H03L7/087; H04L7/00; H04L7/0079; H04L7/0083
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
An arrangement for limiting jitter transients during the interval of switching between a first and a second channel comprising: a constant frequency oscillator including an output and a control input, a first and a second phase detector each having an input connected to an associated incoming channel and another input connected to said oscillator output, including other means operative to detect phase differences between said inputs and developing a control voltage proportional thereto, connect means for selectively impressing said control voltage from one of said first and second phase detectors onto said oscillator control input for accordingly changing the phase of said oscillator output signal, to conform with said input phase differences, each said phase detector further including a control voltage storage means, and other connect means operated to selectively impress said control voltage from said one of said first and second phase detectors to the storage means of the other one of said first and second phase detectors, whereby said other one of said phase detectors has available a control voltage to apply to said oscillator upon operation to an active state.
Claim 2
Dependent Claim
183 words
An arrangement for limiting jitter transients during the interval of switching between a first and a second channel comprising: a constant frequency oscillator including an output and a control input, a first and a second phase detector each having an input connected to an associated incoming channel and another input connected to said oscillator output, including other means operative to detect phase differences between said inputs and developing a control voltage proportional thereto, connect means for selectively impressing said control voltage from one of said first and second phase detectors onto said oscillator control input for accordingly changing the phase of said oscillator output signal, to conform with said input phase differences, each said phase detector further including a control voltage storage means, and other connect means operated to selectively impress said control voltage from said one of said first and second phase detectors to the storage means of the other one of said first and second phase detectors, whereby said other one of said phase detectors has available a control voltage to apply to said oscillator upon operation to an active state.
Claim 3
Dependent Claim
79 words
An arrangement as claimed in claim 1 wherein each said phase detector further includes a phase comparator and a first operational amplifier, said phase comparator having an output, and a first and a second input connected respectively to said oscillator output and said associated incoming channel, said operational amplifier having a first and a second input and an output, filter means connecting said comparator output to said operational amplifier's first input, said operational amplifier output comprising said control voltage.
Claim 4
Dependent Claim
24 words
An arrangement as claimed in claim 2 further including a feedback path from said first operational amplifier output to said operational amplifier second input.
Claim 5
Dependent Claim
15 words
An arrangement as claimed in claim 3 further including a resistor in said feedback path.
Claim 6
Dependent Claim
40 words
An arrangement as claimed in claim 2 including switch in said first and second phase detectors operated to maintain said operational amplifier output disconnected from said associated first or second phase detection storage means respectively when in an active state.
Claim 7
Dependent Claim
25 words
An arrangement as claimed in claim 2 wherein said other connect means includes a second operational amplifier having an output connected to said storage means.
Claim 8
Dependent Claim
14 words
An arrangement as claimed in claim 1 wherein said storage means comprises a capacitor.
Claim 9
Dependent Claim
22 words
An arrangement as claimed in claim 7 including resistive means connecting said storage means capacitor to said first operational amplifier second input.
References Cited (Backward Citations)
US4511859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |