Calibration circuit
First Claim
1. An apparatus to calibrate a target electrical circuit, the target electrical circuit including at least a first variable capacitor and a first resistive element, said apparatus comprising:
- a second variable capacitor proportionally matched to the first variable capacitor;
a measurement branch having at least a second resistive element proportionally matched to the first resistive element, and a current generator to generate a current proportionally matched to a predicted current of the target circuit; and
a digital loop to generate a digital code based on at least a comparison between a first voltage signal of the measurement branch and a predetermined voltage.
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Accused Products
Abstract
An apparatus is provided to calibrate a target electrical circuit. The target electrical circuit includes at least a first variable capacitor and a first resistive element. The apparatus includes a second variable capacitor proportionally matched to the first variable capacitor. The apparatus also includes a measurement branch having at least a second resistive element proportionally matched to the first resistive element, and a current generator to generate a current proportionally matched to a predicted current of the target circuit. The apparatus also includes a digital loop to generate a digital code based on at least a comparison between d first voltage signal of the measurement branch and a predetermined voltage.
43 Citations
68 Claims
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1. An apparatus to calibrate a target electrical circuit, the target electrical circuit including at least a first variable capacitor and a first resistive element, said apparatus comprising:
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a second variable capacitor proportionally matched to the first variable capacitor;
a measurement branch having at least a second resistive element proportionally matched to the first resistive element, and a current generator to generate a current proportionally matched to a predicted current of the target circuit; and
a digital loop to generate a digital code based on at least a comparison between a first voltage signal of the measurement branch and a predetermined voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
comprising a variable resistor having a resistance that is varied according the digital code.
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8. An apparatus to calibrate a target electrical circuit, the target electrical circuit including at least a first variable capacitor and a first resistive element, said apparatus comprising:
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means for providing variable capacitance which is proportionally matched to the first variable capacitor;
means for measuring including at least means for proportionally matching the first resistive element, and means for generating a current that is proportionally matched to a predicted current of the target circuit; and
means for generating a digital code based on at least a comparison between a first voltage signal of the means for measuring and a predetermined voltage. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of calibrating a target electrical circuit, the target electrical circuit including at least a first variable capacitor and a first resistive element, said apparatus comprising:
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matching a second variable capacitor to the first variable capacitor;
providing a measurement branch having at least a second resistive element proportionally matched to the first resistive element, and providing a current proportionally matched to a predicted current of the target circuit; and
generating a digital code based on at least a comparison between a first voltage signal of the measurement branch and a predetermined voltage. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method of calibrating at least one calibrated component of a target electrical circuit with at least one replica component of a calibration circuit, the target electrical circuit and the calibration circuit each including electrical components, said method comprising the steps of:
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correlating the calibrated component of the target circuit and the replica component of the calibration circuit, wherein at least one replica component of the target electrical circuit is proportionally matched to the at least one calibrated electrical component;
driving the calibration circuit to a steady state;
generating a signal code corresponding to the steady-state of the calibration circuit; and
providing the signal code to the target circuit for calibration. - View Dependent Claims (23)
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24. Apparatus for calibrating at least one calibrated electrical component of a target electrical circuit, the target electrical circuit including electrical components, said apparatus comprising:
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means for correlating the at least one calibrated electrical component of the target circuit and at least one replica component of the apparatus, wherein the at least one replica component of the target electrical circuit is proportionally matched to the at least one calibrated electrical component;
means for driving the apparatus to a steady state;
means for generating a signal code corresponding to the steady-state of the apparatus; and
means for providing the signal code to the target circuit for calibration. - View Dependent Claims (25)
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26. A method of calibrating at least one of a variable capacitor and a variable resistor of a target electrical circuit, the method comprising the steps of:
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providing an electrical calibration circuit comprising one of a replica capacitance and a replica resistance, wherein the replica capacitance is proportionally matched to the variable capacitor, wherein the replica resistance is proportionally matched to the variable resistor;
determining a relationship between the target electrical circuit and the at least one of the variable capacitor and the variable resistance;
mapping the relationship to the at least one of the replica capacitance and the replica resistance;
generating a signal which corresponds to a steady state of the electrical calibration circuit; and
providing the signal to at least one of the variable capacitor and the variable resistor of the target electrical circuit. - View Dependent Claims (27, 28, 29, 30)
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31. Apparatus for calibrating a target electrical circuit, the target electrical circuit comprising at least one of a variable capacitor and a variable resistance, the apparatus comprising:
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one of a replica resistance means and a replica capacitance means, wherein the replica capacitance means is proportionally matched to the variable capacitor, wherein the replica resistance means is proportionally matched to the variable resistor;
means for accommodating a relationship between the variable capacitor and the variable resistance of the target electrical circuit and the replica capacitance means and the replica resistance means;
means for mapping the relationship to the replica resistance means and the replica capacitance means;
means for generating a signal which corresponds to a steady state of the apparatus; and
means for providing the signal to at least one of the variable capacitor and the variable resistor. - View Dependent Claims (32, 33, 34, 35)
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36. A method of calibrating a target circuit with a calibration circuit, the target circuit including at least a first and second variable capacitor, the calibration circuit including at least a replica variable capacitor, the method comprising the steps of:
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proportionally matching the replica variable capacitor in the calibration circuit with the first and second variable capacitor the target circuit;
generating a signal in response to a voltage change in the calibration circuit; and
providing the signal to each of the three variable capacitors. - View Dependent Claims (37)
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38. A method of calibrating a target circuit with a calibration circuit, the target circuit including at least a first and second variable capacitor, the calibration circuit including at least a third variable capacitor, the method comprising the steps of:
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proportionally matching components in the calibration circuit with the target circuit;
generating a signal in response to a voltage change in the calibration circuit; and
providing the signal to each of the three variable capacitors, wherein the change in voltage comprises a comparison between a first measured voltage and a predetermined voltage. - View Dependent Claims (39, 40)
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41. Apparatus for calibrating a target circuit, the target circuit including at least a first variable capacitor, the apparatus comprising:
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replica capacitance means proportionally matched to the first variable capacitor;
means for generating a signal in response to a voltage change in the apparatus responsive to the replica capacitance means; and
means for providing the signal to the variable capacitor and to the replica capacitance means.
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42. Apparatus for calibrating a target circuit, the target circuit including at least a first variable capacitor, the apparatus comprising:
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means for providing variable capacitance;
component means for proportionally matching components in the target circuit;
means for generating a signal in response to a voltage change in the apparatus; and
means for providing the signal to the variable capacitor and to the means for providing variable capacitance, wherein the change in voltage comprises a comparison between a first measured voltage and a predetermined voltage. - View Dependent Claims (43)
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44. Apparatus for calibrating a target circuit, the target circuit including at least a first variable capacitor, the apparatus comprising:
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means for providing variable capacitance;
component means for proportionally matching components in the target circuit;
means for generating a signal in response to a voltage change in the apparatus;
means for providing the signal to the variable capacitor and to the means for providing variable capacitance; and
means for generating signal, wherein the signal is incremented by a comparison between a second measured voltage and the predetermined voltage. - View Dependent Claims (45)
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46. An apparatus for calibrating at least one of a target capacitance and a target resistance having a target time constant, comprising:
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a replica capacitance;
a replica resistance, wherein said replica capacitance and said replica resistance have a replica time constant, wherein the replica time constant is proportional to the target time constant;
a calibration circuit responsive to said replica capacitance and said replica resistance to provide an output signal; and
a control circuit to adjust at least one of said replica capacitance by a first amount, and said replica resistance by a second amount in accordance with a deviation of the output signal from a reference signal, wherein at least one of the target capacitance is adjusted in accordance with the first amount, and the target resistance is adjusted in accordance with the second amount. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53)
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54. An apparatus for calibrating at least one of a target capacitance and a target resistance having a target time constant, comprising:
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means for providing replica capacitance;
means for providing replica resistance, wherein said means for providing replica capacitance and said means for providing replica resistance means have a replica time constant, wherein the replica time constant is proportional to the target time constant;
means for calibrating responsive to said means for providing replica capacitance and said means for providing replica resistance to provide an output signal; and
means for controlling to adjust at least one of said means for providing replica capacitance by a first amount, and said means for providing replica resistance by a second amount in accordance with a deviation of the output signal from a reference signal, wherein at least one of the target capacitance is adjusted in accordance with the first amount, and the target resistance is adjusted in accordance with the second amount. - View Dependent Claims (55, 56, 57, 58, 59, 60, 61)
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62. A method of calibrating at least one of a target capacitance and a target resistance having a target time constant in accordance with a replica capacitance and a replica resistance having a replica time constant, the replica time constant being proportional to the target time constant, said method comprising the step of:
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(a) applying a signal to the replica capacitance and the replica resistance;
(b) determining a deviation signal from an output signal of the replica capacitance and the replica resistance and a reference signal;
(c) adjusting at least one of (c1) the replica capacitance by a first amount, and (c2) the replica resistance by a second amount in accordance with a deviation signal;
(d) adjusting at least one of (d1) the target capacitance in accordance with the first amount; and
(d2) the target resistance in accordance with the second amount. - View Dependent Claims (63)
wherein step (c1) comprises the step of switching at least one of the plurality of switched replica capacitances, and wherein step (d1) comprises the step of switching at least one of the plurality of switched target capacitances.
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65. An apparatus to calibrate a target electrical circuit, the target electrical circuit including a first variable capacitor and a first resistive element, said apparatus comprising:
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a second variable capacitor proportionally matched to the first variable capacitor;
a measurement branch having at least a second resistive element proportionally matched to the first resistive element, and a current generator to generate a current proportionally matched to a predicted current of the target circuit; and
a comparator to generate a signal based on at least a comparison between a first voltage signal of the measurement branch and a predetermined voltage. - View Dependent Claims (64)
wherein the target resistance comprises a plurality of switch target resistances, wherein the replica resistance comprises a plurality of switch replica resistances, wherein step (c2) comprises the step of switching at least one of the plurality of switched replica resistances, and wherein step (d2) comprises the step of switching at least one of the plurality of switched target resistances.
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66. An apparatus to calibrate a target electrical circuit, the target electrical circuit including at least a first variable capacitor and a first resistive element, said apparatus comprising:
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means for providing variable capacitance which is proportionally matched to the first variable capacitor;
means for measuring including at least means for proportionally matching the first resistive element, and means for generating a current that is proportionally matched to a predicted current of the target circuit; and
means for generating a signal based on at least a comparison between a first voltage signal of the means for measuring and a predetermined voltage.
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67. A method of calibrating a target electrical circuit, the target electrical circuit including at least a first variable capacitor and a first resistive element, said apparatus comprising:
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matching a second variable capacitor to the first variable capacitor;
providing a measurement branch having at least a second resistive element proportionally matched to the first resistive element, and providing a current proportionally matched to a predicted current of the target circuit; and
generating a signal based on at least a comparison between a first voltage signal of the measurement branch and a predetermined voltage.
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68. An apparatus for calibrating at least one of a target capacitance and a target resistance having a target time constant, comprising:
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replica capacitance means;
replica resistance means, wherein said replica capacitance means and said replica resistance means have a replica time constant, wherein the replica time constant is proportional to the target time constant;
calibrating means responsive to said replica capacitance means and said replica resistance means to provide an output signal; and
controlling means for adjusting at least one of said replica capacitance means by a first amount, and said replica resistance means by a second amount in accordance with a deviation of the output signal from a reference signal, wherein at least one of the target capacitance is adjusted in accordance with the first amount, and the target resistance is adjusted in accordance with the second amount.
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Specification