US5654674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillator control circuit with phase detection feedback
Assignee: Sony Corp
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Filing: 1996-01-04
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Granted: 1997-08-05
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Expires: 2016-01-04
Abstract
Abstract A controllable crystal oscillator of a receiver having a mixer producing an IF signal is controlled by a feedback loop that includes a phase detector. The IF signal is delayed by an odd multiple of π/2 and fed to one input of an exclusive-OR circuit, with the other input receiving the IF signal directly. The phase detection signal from the exclusive-OR circuit can be counted and converted to an analog voltage when the oscillator is a voltage controlled oscillator or it can be counted and used as a digital control signal when the oscillator is a data controlled oscillator.
Inventors
- 👤 Koichi Matsuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:26
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/06; H03D; H03D7/00; H03D7/16; H03D7/161; H03D7/163
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
An oscillation circuit with a feedback loop comprising: oscillation means for producing a predetermined frequency output signal and being controlled by a control signal; mixer means for mixing said output signal from said oscillation means with a received signal and reproducing an intermediate frequency signal; exclusive-OR means for receiving at one input the intermediate signal from said mixer means; delay means for delaying the signal from said mixer means and feeding the delayed signal to another input of said exclusive-OR means, whereby said exclusive-OR means detects a phase of said intermediate signal; and processing means for converting a duty ratio signal output from said exclusive-OR means to said control signal for controlling said oscillation means, wherein said processing means produces a digital data signal for controlling said oscillation means.
Claim 2
Dependent Claim
129 words
An oscillation circuit with a feedback loop comprising: oscillation means for producing a predetermined frequency output signal and being controlled by a control signal; mixer means for mixing said output signal from said oscillation means with a received signal and reproducing an intermediate frequency signal; exclusive-OR means for receiving at one input the intermediate signal from said mixer means; delay means for delaying the signal from said mixer means and feeding the delayed signal to another input of said exclusive-OR means, whereby said exclusive-OR means detects a phase of said intermediate signal; and processing means for converting a duty ratio signal output from said exclusive-OR means to said control signal for controlling said oscillation means, wherein said processing means produces a digital data signal for controlling said oscillation means.
Claim 3
Dependent Claim
19 words
An oscillation circuit with feedback loop as claimed in claim 1, wherein said processing means is a counter circuit.
Claim 4
Dependent Claim
135 words
A receiving apparatus for receiving an RF signal having a mixer for converting an RF signal to an IF signal by mixing with a signal from an oscillation circuit, said oscillation circuit comprising: oscillation means for producing a predetermined frequency signal and being controlled by a control signal; exclusive-OR means for receiving at one input the IF signal from said mixer; delay means for delaying the IF signal from said mixer and feeding the delayed signal to another input of said exclusive-OR means, whereby said exclusive-OR means detects a phase of said IF signal; and processing means for converting a duty ratio signal output from said exclusive-OR means to said control signal for controlling said oscillation means, wherein said processing means produces said control signal as a digital data signal for controlling said oscillation means.
Claim 5
Dependent Claim
135 words
A receiving apparatus for receiving an RF signal having a mixer for converting an RF signal to an IF signal by mixing with a signal from an oscillation circuit, said oscillation circuit comprising: oscillation means for producing a predetermined frequency signal and being controlled by a control signal; exclusive-OR means for receiving at one input the IF signal from said mixer; delay means for delaying the IF signal from said mixer and feeding the delayed signal to another input of said exclusive-OR means, whereby said exclusive-OR means detects a phase of said IF signal; and processing means for converting a duty ratio signal output from said exclusive-OR means to said control signal for controlling said oscillation means, wherein said processing means produces said control signal as a digital data signal for controlling said oscillation means.
Claim 6
Dependent Claim
37 words
A receiving apparatus for receiving an RF signal as claimed in claim 3, wherein said processing means comprises a counter circuit enabled by the duty ratio signal from said exclusive-OR means for counting clock pulses fed thereto.
Claim 7
Dependent Claim
33 words
A receiving apparatus for receiving an RF signal as claimed in claim 3, wherein said processing means comprises a counter circuit and digital-to-analog converter for producing said control signal as an analog voltage.
Claim 8
Dependent Claim
30 words
A receiving apparatus for receiving an RF signal as claimed in claim 3, wherein said delay means has a delay time corresponding to (π/2)*n, where n is an odd number.
References Cited (Backward Citations)
US4255759A
Cited
US4672636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-08-04 | 2001-02-03 | 2001-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-04 | 2005-02-03 | 2005-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-04 | 2009-02-03 | 2009-08-05 | $7700.00 | Window Closed / Lapsed |