Voltage controlled capacitive elements having a biasing network
First Claim
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1. A voltage-controlled oscillator comprising:
- a resonator circuit that includes a capacitive circuit, the capacitive circuit including a plurality of analog voltage controlled capacitive elements coupled to one another; and
a bias voltage source coupled to the plurality of analog voltage controlled capacitive elements, the bias voltage source adapted to provide, in combination with a resistive network, a distinct bias voltage to each of the analog voltage controlled capacitive elements;
where individual ones of the plurality of analog voltage controlled capacitive elements are activated as a function of the magnitude of the voltage thereby increasing linearity of a frequency tuning voltage parameter of the resonator.
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Abstract
A voltage-controlled oscillator includes a resonator circuit and a voltage source. The resonator circuit includes a capacitive circuit that has a plurality of analog voltage controlled capacitive elements coupled to one another. The voltage source is coupled to the resonator circuit and provides a voltage to the plurality of analog voltage controlled capacitive elements. Each of the plurality of analog voltage controlled capacitive elements is activated as a function of the voltage thereby increasing linearity of a frequency tuning voltage parameter of the resonator.
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Citations
24 Claims
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1. A voltage-controlled oscillator comprising:
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a resonator circuit that includes a capacitive circuit, the capacitive circuit including a plurality of analog voltage controlled capacitive elements coupled to one another; and
a bias voltage source coupled to the plurality of analog voltage controlled capacitive elements, the bias voltage source adapted to provide, in combination with a resistive network, a distinct bias voltage to each of the analog voltage controlled capacitive elements;
where individual ones of the plurality of analog voltage controlled capacitive elements are activated as a function of the magnitude of the voltage thereby increasing linearity of a frequency tuning voltage parameter of the resonator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A variable capacitor comprising:
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a pair of nodes comprising an input node and an output node for coupling to a resonator;
a plurality of analog voltage controlled capacitive elements that are electronically coupled to one another and to said pair of nodes; and
a bias voltage input, coupled to a bias voltage source and coupled in common to each of the plurality of analog voltage controlled capacitive elements via a biasing network, the bias voltage input adapted to provide, in combination with said biasing network, a different bias voltage to each of the analog voltage controlled capacitive elements;
where individual ones of the plurality of analog voltage controlled capacitive elements are activated as a function of the control voltage, in concert with the biasing network, to provide a substantially linear change in resonator resonant frequency over a range of control voltages between the input node and the output node. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method of operating a voltage controlled oscillator, comprising:
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generating a plurality of bias voltages;
providing a capacitive circuit that includes a plurality of analog voltage controlled capacitive elements coupled to one another in parallel; and
sequentially activating individual ones of the plurality of analog voltage controlled capacitive elements with a unique one of the plurality of bias voltages to increase the linearity of a frequency tuning voltage parameter. - View Dependent Claims (20)
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21. A mobile station comprising a frequency synthesizer comprised of a phase lock loop (PLL) that includes a voltage controlled oscillator (VCO), a frequency output of said VCO being tuned with a resonator that comprises a variable capacitance, said variable capacitance comprising a plurality of voltage controlled capacitive elements coupled in parallel, further comprising activating means for sequentially activating individual ones of the plurality of voltage controlled capacitive elements as a function of an input analog control voltage and a bias network for increasing linearity of a frequency tuning curve of said VCO;
- where said bias network comprises a resistive network coupled to said voltage controlled capacitive elements, said resistive network being coupled to a fixed bias voltage.
- View Dependent Claims (22)
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23. A mobile station comprising a frequency synthesizer comprised of a phase lock loop (PLL) that includes a voltage controlled oscillator (VCO), a frequency output of said VCO being tuned with a resonator that comprises a variable capacitance, said variable capacitance comprising a plurality of voltage controlled capacitive elements coupled in parallel, further comprising activating means for sequentially activating individual ones of the plurality of voltage controlled capacitive elements as a function of an input analog control voltage and a bias network for increasing linearity of a frequency tuning curve of said VCO;
- where said bias network comprises a resistive network coupled to said voltage controlled capacitive elements, said resistive network being coupled to a variable bias voltage.
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24. A mobile station comprising a frequency synthesizer comprised of a phase lock loop (PLL) that includes a voltage controlled oscillator (VCO), a frequency output of said VCO being tuned with a resonator that comprises a variable capacitance, said variable capacitance comprising a plurality of voltage controlled capacitive elements coupled in parallel, further comprising activating means for sequentially activating individual ones of the plurality of voltage controlled capacitive elements as a function of an input analog control voltage and a bias network for increasing linearity of a frequency tuning curve of said VCO;
- where said bias network comprises a resistive network coupled to said voltage controlled capacitive elements, said resistive network being coupled to a bias voltage established by one of an operational mode or a frequency selection logic of said mobile station.
Specification