Frequency divider with variable capacitance
First Claim
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1. A marker, comprising:
- a first resonant circuit comprising a first planarized coil having a pair of terminals and a capacitor connected to said pair of terminals, said first resonant circuit to generate a first resonant signal in response to an interrogation signal;
a second resonant circuit comprising a second planarized coil having a pair of terminals and a variable capacitor connected to said pair of terminals, with a portion of said second planarized coil to overlap a portion of said first planarized coil, said second resonant circuit to receive said first resonant signal and generate a second resonant signal having a second resonant frequency; and
wherein said variable capacitor comprises a metal-oxide semiconductor device, said metal-oxide semiconductor device to operate as a non-linear capacitor having varying amounts of capacitance corresponding to varying amounts of voltage received by said metal-oxide semiconductor device.
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Abstract
Method and apparatus for a frequency divider using variable capacitance are described.
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Citations
27 Claims
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1. A marker, comprising:
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a first resonant circuit comprising a first planarized coil having a pair of terminals and a capacitor connected to said pair of terminals, said first resonant circuit to generate a first resonant signal in response to an interrogation signal;
a second resonant circuit comprising a second planarized coil having a pair of terminals and a variable capacitor connected to said pair of terminals, with a portion of said second planarized coil to overlap a portion of said first planarized coil, said second resonant circuit to receive said first resonant signal and generate a second resonant signal having a second resonant frequency; and
wherein said variable capacitor comprises a metal-oxide semiconductor device, said metal-oxide semiconductor device to operate as a non-linear capacitor having varying amounts of capacitance corresponding to varying amounts of voltage received by said metal-oxide semiconductor device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 19)
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11. A system, comprising:
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a transmitter to transmit an interrogation signal operating at a first frequency;
a security tag having a marker, said marker comprising;
a first resonant circuit comprising a first planarized coil having a pair of terminals and a capacitor connected to said pair of terminals, said first resonant circuit to generate a first resonant signal in response to said interrogation signal;
a second resonant circuit comprising a second planarized coil having a pair of terminals and a variable capacitor connected to said pair of terminals, with a portion of said second planarized coil to overlap a portion of said first planarized coil, said second resonant circuit to receive said first resonant signal and generate a second resonant signal having a second resonant frequency;
wherein said variable capacitor comprises a metal-oxide semiconductor device, said metal-oxide semiconductor device to operate as a non-linear capacitor having varying amounts of capacitance corresponding to varying amounts of voltage received by said metal-oxide semiconductor device; and
a detector to detect said second resonant signal from said marker and generate a detection signal in accordance with said second resonant signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 20, 21)
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22. A method, comprising:
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receiving an interrogation signal at a first resonant circuit for a marker;
generating a first resonant signal having a first resonant frequency in response to the interrogation signal;
receiving said first resonant signal at a second resonant circuit overlapping said first resonant circuit; and
generating a second resonant signal having a second resonant frequency in response to said first resonant signal using variable capacitance, with said second resonant frequency being different from said first resonant frequency. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification