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US5909150A
Expired / Lapsed
US
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System and method for improving the regulation of a supply voltage for a controllable oscillator using feed forward control techniques
Assignee: Cirrus Logic Inc
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Filing: 1997-10-23
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Granted: 1999-06-01
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Expires: 2017-10-23
Abstract
Abstract A system and method for regulating the voltage at an input node of a varying current demand circuit is provided. The input node may be a power supply node and the varying current demand circuit may be a controllable oscillator. In addition, a frequency synthesizer may be formed from a phase locked loop which includes the controllable oscillator and a voltage control circuit. The voltage control circuit may receive an input control signal that varies as the current demand of the controllable oscillator varies. In response to the input control signal, the voltage control circuit may provide a more stable voltage supply to the controllable oscillator even as the current demands of the oscillator vary widely. The input control signal may be generated by generating a signal from the loop path of the phase locked loop. The frequency synthesizer may be utilized in a data storage system data detection circuit, such as for example, a data detection circuit used for recovering data from an optical disk.
Inventors
- 👤 Matthew M. Kostelnik
- 👤 David M. Pietruszynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:19
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; H; H03; H03K; H03K3/00; H03K3/02; H03K3/027; H03K3/03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/099; H03L7/0995; H03L2207/00; H03L2207/06; H03L7/16; H03L7/18; H03L7/183
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
90 words
A method of operating a data detection circuit, comprising: generating a clock signal from a frequency synthesizer, the frequency synthesizer including a phase locked loop, the phase locked loop including a controllable oscillator; coupling the controllable oscillator to a power supply node; controlling the power supply node with a power supply control circuit; providing a control signal from the phase locked loop to the power supply control circuit; and controlling a current provided to or from the power supply node to counteract a current demand change of the controllable oscillator.
Claim 2
Independent Claim
90 words
A method of operating a data detection circuit, comprising: generating a clock signal from a frequency synthesizer, the frequency synthesizer including a phase locked loop, the phase locked loop including a controllable oscillator; coupling the controllable oscillator to a power supply node; controlling the power supply node with a power supply control circuit; providing a control signal from the phase locked loop to the power supply control circuit; and controlling a current provided to or from the power supply node to counteract a current demand change of the controllable oscillator.
Claim 3
Dependent Claim
25 words
The method of claim 1, the providing step further comprising utilizing the control signal to provide feed forward control to the power supply control circuit.
Claim 4
Dependent Claim
13 words
The method of claim 2, the power supply node being a voltage node.
Claim 5
Dependent Claim
31 words
The method of claim 2, the controllable oscillator being a current controlled oscillator, and the control signal being indicative of a current input control signal that controls the current controlled oscillator.
Claim 6
Dependent Claim
39 words
The method of claim 4, the current provided to or from the power supply node being supplied or sunk from the power supply node by a variable current source, the variable current source being controlled by the control signal.
Claim 7
Independent Claim
118 words
A method of operating a data storage system, comprising: transmitting a data signal from a data storage medium to a data detection circuit; generating, within the data detection circuit, a clock signal from a phase locked loop, the phase locked loop including a controllable oscillator; providing a power supply to the controllable oscillator; controlling the power supply with a feed forward control signal from the phase locked loop so as to regulate the power supply and to provide a more accurate clock signal by controlling a current supplied to the controllable oscillator; and processing the data signal with at least one circuit within the data detection circuit, the at least one circuit being clocked by the clock signal.
Claim 8
Independent Claim
118 words
A method of operating a data storage system, comprising: transmitting a data signal from a data storage medium to a data detection circuit; generating, within the data detection circuit, a clock signal from a phase locked loop, the phase locked loop including a controllable oscillator; providing a power supply to the controllable oscillator; controlling the power supply with a feed forward control signal from the phase locked loop so as to regulate the power supply and to provide a more accurate clock signal by controlling a current supplied to the controllable oscillator; and processing the data signal with at least one circuit within the data detection circuit, the at least one circuit being clocked by the clock signal.
Claim 9
Dependent Claim
13 words
The method of claim 6, the controllable oscillator being a current controlled oscillator.
Claim 10
Dependent Claim
17 words
The method of claim 7, the controllable oscillator placing a varying current demand upon the power supply.
Claim 11
Dependent Claim
13 words
The method of claim 6, the data storage medium being an optical disk.
Claim 12
Dependent Claim
34 words
The method of claim 6, the controlling step further comprising adding or removing current to a supply node of the power supply so as to maintain a more constant voltage at the supply node.
Claim 13
Independent Claim
66 words
A method of operating a frequency synthesizer, comprising: forming a phase locked loop; regulating a power supply provided to a controllable oscillator of the phase locked loop; generating a power supply control signal from the phase locked loop; and adjusting the regulation of the power supply with the power supply control signal by controlling a current to counteract a current demand change of the controllable oscillator.
Claim 14
Independent Claim
66 words
A method of operating a frequency synthesizer, comprising: forming a phase locked loop; regulating a power supply provided to a controllable oscillator of the phase locked loop; generating a power supply control signal from the phase locked loop; and adjusting the regulation of the power supply with the power supply control signal by controlling a current to counteract a current demand change of the controllable oscillator.
Claim 15
Dependent Claim
23 words
The method of claim 11, further comprising providing the power supply control signal as a feed forward control signal to the power supply.
Claim 16
Dependent Claim
13 words
The method of claim 11, the controllable oscillator being a current controlled oscillator.
Claim 17
Dependent Claim
23 words
The method of claim 13, the power supply control signal being representative of the current input control signal of the current controlled oscillator.
Claim 18
Dependent Claim
17 words
The method of claim 13, the current controlled oscillator placing varying current demands upon the power supply.
Claim 19
Dependent Claim
42 words
The method of claim 15, the adjusting step further comprising adding or removing current from a power supply node so as to improve the voltage regulation of the power supply node, the power supply node being coupled to the current controlled oscillator.
Claim 20
Dependent Claim
14 words
The method of claim 11, the power supply circuit comprising a voltage regulator circuit.
Claim 21
Dependent Claim
29 words
The method of claim 17, the power supply circuit further comprising a variable current source, the adjusting step further comprising varying a current output of the variable current source.
Claim 22
Dependent Claim
22 words
The method of claim 11, the power supply control signal being indicative of an input control signal that controls the controllable oscillator.
Claim 23
Independent Claim
124 words
A method of operating a circuit, the circuit having a varying current demand at a voltage supply node, the method comprising: coupling the circuit to the voltage supply node; generating within the circuit a varying current demand at the voltage supply node, the varying current demand dependent upon a circuit control signal; controlling the voltage at the voltage supply node with a voltage supply control circuit; providing a feed forward control signal to the voltage supply control circuit, the feed forward control signal bearing a relationship to the circuit control signal; controlling the voltage supply control circuit with the feed forward control signal; and controlling a current provided to or from the power supply node to counteract the current demand change of the circuit.
Claim 24
Independent Claim
124 words
A method of operating a circuit, the circuit having a varying current demand at a voltage supply node, the method comprising: coupling the circuit to the voltage supply node; generating within the circuit a varying current demand at the voltage supply node, the varying current demand dependent upon a circuit control signal; controlling the voltage at the voltage supply node with a voltage supply control circuit; providing a feed forward control signal to the voltage supply control circuit, the feed forward control signal bearing a relationship to the circuit control signal; controlling the voltage supply control circuit with the feed forward control signal; and controlling a current provided to or from the power supply node to counteract the current demand change of the circuit.
Claim 25
Dependent Claim
19 words
The method of claim 20, the feed forward control signal being approximately the same as the circuit control signal.
Claim 26
Dependent Claim
27 words
The method of claim 21, controlling step further comprising adding or removing a current from the voltage supply node in response to the voltage supply control circuit.
Claim 27
Dependent Claim
107 words
A data detection circuit for processing data from a data storage medium, comprising: a phase locked loop; a clock signal generated by the phase locked loop, the clock signal utilized to clock at least one circuit of the data detection circuit; a controllable oscillator within the phase locked loop, an output of the controllable oscillator providing the clock signal; a power supply node coupled to the controllable oscillator; a power supply control circuit coupled to the power supply node; and a control signal generated from the phase locked loop, the control signal coupled to the power supply circuit to control a current at the power supply node.
Claim 28
Dependent Claim
107 words
A data detection circuit for processing data from a data storage medium, comprising: a phase locked loop; a clock signal generated by the phase locked loop, the clock signal utilized to clock at least one circuit of the data detection circuit; a controllable oscillator within the phase locked loop, an output of the controllable oscillator providing the clock signal; a power supply node coupled to the controllable oscillator; a power supply control circuit coupled to the power supply node; and a control signal generated from the phase locked loop, the control signal coupled to the power supply circuit to control a current at the power supply node.
Claim 29
Dependent Claim
16 words
The data detection circuit of claim 23, the power supply control circuit comprising a voltage regulator.
Claim 30
Dependent Claim
18 words
The data detection circuit of claim 24, the power supply control circuit further comprising a variable current source.
Claim 31
Dependent Claim
15 words
The data detection circuit of claim 23, the controllable oscillator being a current controlled oscillator.
Claim 32
Dependent Claim
20 words
The data detection circuit of claim 26, the current controlled oscillator placing varying current demands upon the power supply node.
Claim 33
Dependent Claim
34 words
The data detection circuit of claim 27, the power supply control circuit further comprising a variable current source to add or remove current from the power supply node in response to the control signal.
Claim 34
Dependent Claim
108 words
A frequency synthesizer, comprising: a phase locked loop; a controllable oscillator within the phase locked loop, an output of the controllable oscillator providing the phase locked loop output; a first control signal coupled to the controllable oscillator for controlling the controllable oscillator; a power supply node coupled to the controllable oscillator; a power supply control circuit coupled to the power supply node; and a power supply control signal generated from the phase locked loop, the power supply control signal being indicative of the first control signal to control a current provided to or from the power supply node to counteract a current demand change of the controllable oscillator.
Claim 35
Dependent Claim
108 words
A frequency synthesizer, comprising: a phase locked loop; a controllable oscillator within the phase locked loop, an output of the controllable oscillator providing the phase locked loop output; a first control signal coupled to the controllable oscillator for controlling the controllable oscillator; a power supply node coupled to the controllable oscillator; a power supply control circuit coupled to the power supply node; and a power supply control signal generated from the phase locked loop, the power supply control signal being indicative of the first control signal to control a current provided to or from the power supply node to counteract a current demand change of the controllable oscillator.
Claim 36
Dependent Claim
17 words
The frequency synthesizer of claim 29, the power supply control signal being a feed forward control signal.
Claim 37
Dependent Claim
15 words
The frequency synthesizer of claim 30, the power supply control circuit comprising a voltage regulator.
Claim 38
Dependent Claim
17 words
The frequency synthesizer of claim 31, the power supply control circuit further comprising a variable current source.
Claim 39
Dependent Claim
14 words
The frequency synthesizer of claim 30, the controllable oscillator being a current controlled oscillator.
Claim 40
Dependent Claim
20 words
The frequency synthesizer of claim 33, the current controlled oscillator placing a varying current demand upon the power supply node.
Claim 41
Dependent Claim
20 words
The frequency synthesizer of claim 34, the power supply control circuit comprising a voltage regulator and a variable current source.
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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) | 2002-05-31 | 2002-11-30 | 2003-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-31 | 2006-11-30 | 2007-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-31 | 2010-11-30 | 2011-06-01 | $7700.00 | Window Closed / Lapsed |