Variable filter
AssigneeAniotek Limited
InventorsJorgen Staal Nielsen, Richard Nichols
Life of this patent
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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.
Claims16
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.
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.
A variable filter for an analog electromagnetic signal, 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, 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.
Dependencies are inferred from the claim text.