US5157355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase-locked loop device having stability over wide frequency range
Assignee: Canon Inc
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Filing: 1991-12-31
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Granted: 1992-10-20
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Expires: 2011-12-31
Abstract
Abstract A phase-locked loop device for producing an output clock synchronized in phase with an input clock, wherein in addition to a loop responsive to the phase difference between an output clock of a controlled oscillator and the input clock for controlling the controlled oscillator, there is provided another loop for controlling the controlled oscillator in accordance with the frequency difference between the output clock of the controlled oscillator and a reference clock.
Inventors
- 👤 Akihiro Shikakura
- 👤 Shinichi Yamashita
- 👤 Makoto Gohda
- 👤 Yasuyuki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:49
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/085; H03L7/087; H03L7/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
177 words
A phase-locked loop device comprising: (a) controlled oscillation means; p1 (b) input means for inputting a clock; (c) first means for generating a first control signal on the basis of a difference in phase between the clock input by said input means and a clock produced by said controlled oscillation means; (d) generating means for generating a reference signal; (e) second means for generating a second control signal on the basis of a difference in frequency between the reference signal and the clock produced by said controlled oscillation means; (f) control means for controlling said controlled oscillation means in accordance with the first control signal and the second control signal, said control means including addition circuit means for adding said first control signal and said second control signal and providing an output signal of said addition circuit means as a control input to said controlled oscillation means; and (g) inhibition means for inhibiting said first control signal from being supplied to said addition circuit means for a specific period of time in a predetermined period of time.
Claim 2
Dependent Claim
177 words
A phase-locked loop device comprising: (a) controlled oscillation means; p1 (b) input means for inputting a clock; (c) first means for generating a first control signal on the basis of a difference in phase between the clock input by said input means and a clock produced by said controlled oscillation means; (d) generating means for generating a reference signal; (e) second means for generating a second control signal on the basis of a difference in frequency between the reference signal and the clock produced by said controlled oscillation means; (f) control means for controlling said controlled oscillation means in accordance with the first control signal and the second control signal, said control means including addition circuit means for adding said first control signal and said second control signal and providing an output signal of said addition circuit means as a control input to said controlled oscillation means; and (g) inhibition means for inhibiting said first control signal from being supplied to said addition circuit means for a specific period of time in a predetermined period of time.
Claim 3
Dependent Claim
58 words
A device according to claim 1, wherein said first means includes a phase comparison circuit for producing a phase difference signal having a level corresponding to the difference in phase between the clock inputted by said input means and the clock produced by said controlled oscillation means, and a filter to which the phase difference signal is supplied.
Claim 4
Dependent Claim
43 words
A device according to claim 1, wherein said second means includes a frequency comparison circuit for producing a frequency difference signal having a level corresponding to the difference in frequency between the reference signal and the clock produced by said controlled oscillation means.
Claim 5
Dependent Claim
40 words
A device according to claim 3, wherein said frequency comparison circuit produces a frequency difference signal having a level corresponding to the differences in frequency and phase between the reference signal and the clock produced by said controlled oscillation means.
Claim 6
Dependent Claim
71 words
A device according to claim 3, wherein said second means supplies the frequency difference signal as the second control signal to said addition circuit only for the specific period of time in the predetermined period of time, and supplies a signal obtained by sampling and holding the frequency difference signal as the second control signal to said addition circuit for a period of time other than the specific period of time.
Claim 7
Dependent Claim
23 words
A device according to claim 1, wherein said reference signal generating means is able to change over a frequency of the reference signal.
Claim 8
Dependent Claim
50 words
A device according to claim 6, wherein said reference signal generating means includes an oscillation circuit and a frequency dividing circuit for dividing a frequency of an oscillation signal generated by said oscillation circuit, the rate of frequency division of said frequency dividing circuit being able to be changed over.
Claim 9
Dependent Claim
63 words
A device according to claim 7, wherein said oscillation circuit is a controlled oscillation circuit, and wherein said reference signal generating means further includes a phase comparison circuit for supplying to said controlled oscillation circuit a signal having a level corresponding to a difference in phase between a frequency-divided signal produced by said frequency dividing circuit and a signal of a predetermined frequency.
Claim 10
Dependent Claim
29 words
A device according to claim 7, wherein said reference signal generating means supplies the oscillation signal generated by said oscillation circuit as the reference signal to said second means.
Claim 11
Dependent Claim
113 words
A phase-locked loop device comprising: (a) a controlled oscillator; (b) input means for inputting a clock; (c) a first loop circuit for controlling said controlled oscillator on the basis of a difference in phase between the clock input by said input means and a clock produced by said controlled oscillator; (d) generating means for generating a reference signal; (e) a second loop circuit for controlling said controlled oscillator on the basis of a difference in frequency between the reference signal and the clock produced by said controlled oscillator; and (f) inhibition means for inhibiting an operation of said first loop circuit for a specific period of time in a predetermined period of time.
Claim 12
Dependent Claim
113 words
A phase-locked loop device comprising: (a) a controlled oscillator; (b) input means for inputting a clock; (c) a first loop circuit for controlling said controlled oscillator on the basis of a difference in phase between the clock input by said input means and a clock produced by said controlled oscillator; (d) generating means for generating a reference signal; (e) a second loop circuit for controlling said controlled oscillator on the basis of a difference in frequency between the reference signal and the clock produced by said controlled oscillator; and (f) inhibition means for inhibiting an operation of said first loop circuit for a specific period of time in a predetermined period of time.
Claim 13
Dependent Claim
23 words
A device according to claim 10, wherein said reference signal generating means is able to change over a frequency of the reference signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |