Active multi-pole filter
AssigneeAnlotek Limited
InventorsJorgen Staal Nielsen, Richard Nichols
Life of this patent
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Abstract
An RF signal is processed by coupling an input signal into a signal loop, the signal loop comprising a resonator and a processing block, and filtering the input signal in the signal loop to produce an output signal by obtaining a plurality of resonator outputs from the resonator and processing the plurality of resonator outputs to generate feedback signals. The feedback signals are connected to a point upstream of the resonator. At least one of the plurality of resonator outputs is processed in the processing block. The signal loop is definable by a transfer function having poles, and the plurality of resonator outputs are processed such that the poles of the transfer function are independently controllable.
Claims22
A method of processing an RF signal, comprising:
- coupling an input signal into a signal loop, the signal loop comprising a resonator and a processing block;
- filtering the input signal in the signal loop to produce an output signal by:
- processing an output of the resonator in the processing block to generate a feedback signal, the feedback signal being connected to a point upstream of the resonator;
- wherein processing the output of the resonator comprises a domain transfer using discrete time samples;
- and
- the signal loop is definable by a transfer function having one or more poles, and the output of the resonator is processed such that the one or more poles of the transfer function are independently controllable.
An apparatus for processing an RF signal, comprising:
- a signal loop comprising an input, an output, a resonator, and a feedback path connected to receive an output of the resonator, the feedback path having a feedback output connected upstream of the resonator, wherein the feedback path comprises a processing block and is configured to process the output of the resonator and introduce a feedback output signal at the feedback output;
- wherein the processing block applies a domain transfer using discrete time samples;
- and
- the signal loop is definable by a transfer function having one or more poles, and the processing block is configured to process the output of the resonator such that the one or more poles of the transfer function are independently controllable.
A method of processing an RF signal, comprising:
- coupling an input signal into a signal loop, the signal loop comprising a resonator;
- and
- filtering the input signal in the signal loop to produce an output signal by:
- obtaining a plurality of resonator outputs from the resonator;
- and
- processing the plurality of resonator outputs to generate feedback signals upstream of the resonator in a first path and a second path that is connected in parallel with the first path, wherein the second path comprises a domain transformation using discrete time samples;
- wherein the signal loop is definable by a transfer function, and the plurality of resonator outputs are processed such that poles of the transfer function are individually controllable.
Dependencies are inferred from the claim text.