Variable filter
First Claim
Patent Images
1. A variable filter for an analog electromagnetic signal, comprising:
- a secondary signal loop comprising a secondary signal path and a secondary feedback path connected between a signal input and a signal output, the secondary signal loop comprising a plurality of primary signal loops in the secondary signal path and a secondary adjustable scaling block in the secondary feedback path that applies a gain factor, the gain factor of the secondary adjustable scaling block being adjustable in a range between a positive gain that is greater than zero and a negative gain that is less than zero;
each of the plurality of primary signal loops comprising a primary signal path and a primary feedback path, wherein;
the primary signal path comprises a frequency tunable resonator; and
the primary feedback path comprises a primary adjustable scaling block that applies a gain factor, the gain factor of the primary adjustable scaling block being adjustable in a range between a positive gain that is greater than zero and a negative gain that is less than zero; and
a controller connected to tune each frequency tunable resonator and to adjust the gain factor of each of the primary adjustable scaling blocks and the secondary adjustable scaling block between a negative gain factor and a positive gain factor.
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Abstract
A variable filter has a signal loop defined between a signal input and a signal output. A plurality of circuit elements connected in the signal loop, the plurality of circuit elements comprising a frequency tunable resonator, and an adjustable scaling block that applies a gain factor that is adjustable in a range that comprises a positive gain and a negative gain. A controller is connected to 1) tune the frequency tunable resonator; and to 2) adjust the gain factor of the adjustable scaling block between a negative gain factor to a positive gain factor providing for variable Q independent of frequency.
48 Citations
16 Claims
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1. A variable filter for an analog electromagnetic signal, comprising:
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a secondary signal loop comprising a secondary signal path and a secondary feedback path connected between a signal input and a signal output, the secondary signal loop comprising a plurality of primary signal loops in the secondary signal path and a secondary adjustable scaling block in the secondary feedback path that applies a gain factor, the gain factor of the secondary adjustable scaling block being adjustable in a range between a positive gain that is greater than zero and a negative gain that is less than zero; each of the plurality of primary signal loops comprising a primary signal path and a primary feedback path, wherein; the primary signal path comprises a frequency tunable resonator; and the primary feedback path comprises a primary adjustable scaling block that applies a gain factor, the gain factor of the primary adjustable scaling block being adjustable in a range between a positive gain that is greater than zero and a negative gain that is less than zero; and a controller connected to tune each frequency tunable resonator and to adjust the gain factor of each of the primary adjustable scaling blocks and the secondary adjustable scaling block between a negative gain factor and a positive gain factor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of filtering an analog electromagnetic signal, comprising the steps of:
providing a filter comprising; a signal loop defined between a signal input and a signal output; a plurality of circuit elements connected in the signal loop, the plurality of circuit elements comprising; a frequency tunable resonator; and an adjustable scaling block that applies a gain factor that is adjustable in a range that comprises a positive gain and a negative gain; and a controller connected to tune the frequency tunable resonator and control the gain factor of the adjustable scaling block; and adjusting the filter by tuning the frequency tunable resonator and adjusting the gain factor of the adjustable scaling block, the filter being adjusted to Q-spoil the frequency tunable resonator and to achieve a desired frequency response in the filter. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A variable filter for an analog electromagnetic signal, comprising:
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a signal loop defined between a signal input and a signal output; a plurality of circuit elements connected in the signal loop, the plurality of circuit elements comprising; a frequency tunable resonator; and an adjustable scaling block that applies a gain factor, the gain factor being adjustable in a range that comprises a positive gain and a negative gain; and a controller connected to the frequency tunable resonator and the adjustable scaling block, the controller comprising instructions to Q-spoil the frequency tunable resonator by adjusting at least the gain factor. - View Dependent Claims (14, 15, 16)
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Specification