Receiver, communication unit, and method for down-converting a radio frequency signal
AssigneeMediaTek Singapore Pte. Ltd.
InventorFederico Alessandro Fabrizio Beffa
Life of this patent
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Abstract
There is provided a communication receiver comprising: an input for receiving a radio frequency, RF, input signal; and at least one finite impulse response, FIR, discrete time filter, DTF. The at least one FIR DTF comprises: an input circuit comprising an input port for sampling the RF input signal at a sampling frequency that is comparable to the input RF input signal; and N parallel branches, each branch having a set of input unit sampling capacitances, where each unit sampling capacitance is independently selectively coupleable to an output summing node. The input circuit is configured to convert an equivalent input impedance of the at least one FIR DTF around the sampling frequency to a real impedance.
Claims20
A radio frequency, RF, communication receiver comprising:
- an input for receiving a RF input signal;
- and
- at least one finite impulse response, FIR, discrete time filter, DTF, that comprises:
- an input circuit comprising an input shunt reactive component and an input port for sampling the RF input signal at a sampling frequency that is comparable to the RF input signal;
- and
- N parallel branches, each branch having a set of input unit sampling capacitances, where each unit sampling capacitance is independently selectively coupleable to an output summing node;
- and
- wherein the input circuit of the at least one FIR DTF is a first stage of the communication receiver and configured to convert an equivalent input impedance of the at least one FIR DTF around the sampling frequency to a real impedance and a combination of the input shunt reactive component and the sampling capacitances of each of the N parallel branches forms a filter that concurrently limits a bandwidth of the input circuit.
A radio frequency, RF, communication unit comprising a receiver having:
- an input for receiving a RF input signal;
- and
- at least one finite impulse response, FIR, discrete time filter, DTF, that comprises:
- an input circuit comprising an input shunt reactive component and an input port for sampling the RF input signal at a sampling frequency that is comparable to the RF input signal;
- and
- N parallel branches, each branch having a set of input unit sampling capacitances, where each unit sampling capacitance is independently selectively coupleable to an output summing node;
- wherein the input circuit of the at least one FIR DTF is a first stage of the receiver and configured to convert an equivalent input impedance of the at least one FIR DTF around the sampling frequency to a real impedance and a combination of the input shunt reactive component and the sampling capacitances of each of the N parallel branches forms a filter that concurrently limits a bandwidth of the input circuit.
A method of down conversion of a radio frequency signal in a radio frequency, RF, communication receiver comprising at least one finite impulse response, FIR, discrete time filter, DTF that comprises an input coupled to N parallel branches, each branch having a set of input unit sampling capacitances, the method comprising:
- receiving a RF input signal;
- converting an equivalent input impedance of the at least one FIR DTF around a sampling frequency to a real impedance;
- sampling, at the input of the at least one FIR DTF, configured as a first stage of the communication receiver comprising an input shunt reactive component as part of an input circuit, the RF input signal at the sampling frequency, wherein the sampling frequency is comparable to the RF input signal;
- and
- independently selectively coupling a set of unit sampling capacitances to an output summing node of the at least one FIR DTF to provide a frequency down-converted signal, such that a combination of the input shunt reactive component and the set of input unit sampling capacitances forms a filter that concurrently limits a bandwidth of the input circuit.
Dependencies are inferred from the claim text.