ADJUSTABLE CAPACITOR, DIGITALLY CONTROLLED OSCILLATOR, AND ALL-DIGITAL PHASE LOCKED LOOP
First Claim
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1. An adjustable capacitor, comprising:
- a capacitor unit comprising a plurality of capacitor groups arranged in a matrix format; and
a switch unit which adjusts the capacitance of the capacitor unit by connecting at least two capacitor groups of the plurality of capacitor groups in parallel according to a selection signal,wherein the selection signal indicates a column and row information of the at least two capacitors according to the matrix format.
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Abstract
An adjustable capacitor is provided including a capacitor unit including a plurality of capacitor groups aligned in a matrix format and a switch unit to adjust capacitance by connecting the plurality of capacitor groups in parallel according to a selection signal of a column and row of the matrix. Accordingly, the adjustable capacitor may be realized of a small size but with a high capacitance change rate.
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Citations
21 Claims
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1. An adjustable capacitor, comprising:
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a capacitor unit comprising a plurality of capacitor groups arranged in a matrix format; and a switch unit which adjusts the capacitance of the capacitor unit by connecting at least two capacitor groups of the plurality of capacitor groups in parallel according to a selection signal, wherein the selection signal indicates a column and row information of the at least two capacitors according to the matrix format. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A digitally controlled oscillator, comprising:
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an inductor; an adjustable capacitor comprising a plurality of capacitor groups arranged in a matrix format in which capacitance is adjusted by selectively connecting in parallel at least two capacitor groups of the plurality of capacitor groups; and a control unit which controls an oscillation frequency of the digitally controlled oscillator by adjusting the capacitance of the adjustable capacitor, wherein the control unit adjusts the capacitance by providing the adjustable capacitor a column and row information of the at least two capacitor groups according to the matrix form. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An all-digital phase locked loop, comprising:
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a digitally controlled oscillator to adjust oscillation frequency by changing a connection state of a plurality of capacitor groups arranged in a matrix format; a detection unit to compare oscillation frequency output from the digitally controlled oscillator with a standard frequency, and detect a phase difference and a frequency difference between the oscillation frequency and the standard frequency; and a digital loop filter to provide a digital control signal with respect to the digitally controlled oscillator based on the detected phase difference and the detected frequency difference, wherein the digital control signal provides a column and row information of the plurality of capacitor groups according to the matrix format to adjust the connection state of the plurality of capacitor groups. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification