Variable filter
AssigneeAnlotek 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.
Claims14
A variable analog filter, comprising:
- a signal loop comprising a signal path and a feedback path connected between a signal input and a signal output;
- and
- a plurality of circuit elements connected in the signal loop, the plurality of circuit elements comprising:
- a plurality of frequency tunable resonators;
- 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 each frequency tunable resonator and to adjust the gain factor of the adjustable scaling block toward a desired frequency response.
A method of filtering an analog electromagnetic signal, the method comprising the steps of:
- providing a filter comprising:
- a signal loop comprising a signal path and a feedback path connected between a signal input and a signal output;
- and
- a plurality of circuit elements connected in the signal loop, the plurality of circuit elements comprising:
- a plurality of frequency tunable resonators;
- 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
- tuning the frequency tunable resonators and adjusting the gain factor of the adjustable scaling block toward a desired frequency response.
Dependencies are inferred from the claim text.