Dynamically adjustable Q-factors
First Claim
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1. A mobile communication device, comprising:
- a resonant circuit having an adjustable q-factor, wherein the resonant circuit is adapted to pass a resonant frequency component and attenuate a non-resonant frequency component; and
a non-resonant frequency component detector adapted to compare the non-resonant frequency component to a threshold, and further adapted to provide feedback to the resonant circuit to dynamically adjust the q-factor based on the threshold comparison.
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Abstract
One embodiment relates to a circuit for active loss compensation. The circuit includes a parallel inductor-capacitive (LC) tank circuit having a first single-ended output. A first adjustable capacitor, which includes a first terminal and a second terminal, is coupled to the first single-ended output. The circuit also includes a first pair of transistors having sources coupled to a first common node. One transistor of the first pair of transistors has a drain coupled to the first single-ended output and the other transistor of the first pair of transistors has a gate coupled to the second terminal of the first adjustable capacitor. Other embodiments are also disclosed.
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Citations
18 Claims
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1. A mobile communication device, comprising:
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a resonant circuit having an adjustable q-factor, wherein the resonant circuit is adapted to pass a resonant frequency component and attenuate a non-resonant frequency component; and a non-resonant frequency component detector adapted to compare the non-resonant frequency component to a threshold, and further adapted to provide feedback to the resonant circuit to dynamically adjust the q-factor based on the threshold comparison. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A circuit with an adjustable Q-factor comprising:
- a parallel inductor-capacitive (LC) tank circuit having a single ended output;
an adjustable capacitor having a first terminal and a second terminal, where the first terminal is coupled to the single-ended output; and
a pair of transistors having sources coupled to a common node, wherein one transistor of the pair of transistors has a drain coupled to the single-ended output and an other transistor of the pair of transistors has a gate coupled to the second terminal of the adjustable capacitor;
where the other transistor has a drain that is directly tied to an approximately constant voltage supply and which receives an approximately constant voltage therefrom, or where the one transistor and the other transistor have different length-to width ratios.
- a parallel inductor-capacitive (LC) tank circuit having a single ended output;
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8. A circuit with an adjustable Q-factor, comprising:
- a parallel inductor-capacitive (LC) tank circuit having a first single-ended output;
a first adjustable capacitor having a first terminal and a second terminal, where the first terminal is coupled to the first single-ended output; and
a first pair of transistors having sources coupled to a first common node, wherein one transistor of the first pair of transistors has a drain coupled to the first single-ended output and an other transistor of the first pair of transistors has a gate coupled to the second terminal of the first adjustable capacitor;
where the parallel LC tank circuit having a second single-ended output, further comprising;
a second adjustable capacitor having a first terminal and a second terminal, where the first terminal of the second adjustable capacitor is coupled to the second single-ended output; and
a second pair of transistors having sources coupled to a second common node, wherein one transistor of the second pair of transistors has a drain coupled to the second single-ended output and an other transistor M4 of the second pair of transistors has a gate coupled to the second terminal of the second adjustable capacitor. - View Dependent Claims (9, 10)
- a parallel inductor-capacitive (LC) tank circuit having a first single-ended output;
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11. A method for Q-factor adjustment, comprising:
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providing a radio frequency (RF) signal to a resonant circuit having an adjustable Q-factor, where the RF signal includes a wanted frequency component and an unwanted frequency component; processing the RF signal to attenuate the unwanted frequency component, thereby generating a processed RF signal; comparing the unwanted frequency component in the processed RF signal to a threshold; and adjusting the Q-factor of the resonant circuit based on the comparison to alter the unwanted frequency component in the processed RF signal. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A mobile communication device, comprising:
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a resonant circuit having an dynamically adjustable q-factor, wherein the resonant circuit is adapted to pass a wanted frequency component and attenuate an unwanted frequency component; and means for adjusting the Q-factor of the resonant circuit based on a comparison of the unwanted frequency component to a threshold. - View Dependent Claims (18)
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Specification