Hybrid receiver architecture using upconversion followed by direct downconversion
AssigneeMaxLinear, Inc.
InventorsKishore Seendripu, Raymond Montemayor, Sheng Ye, Glenn Chang, Curtis Ling
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Abstract
A receiver configured to selectively receive an RF signal from an operating band having a plurality of RF channels. The receiver is configured to upconvert the desired RF channel to an intermediate frequency (IF) greater than the RF channel frequencies. The upconverted RF channel is downconverted to baseband or a low IF. The receiver can perform channel selection by filtering the baseband or low IF signal. The baseband or low IF signal can be upconverted to a programmable output IF.
Claims21
A receiver comprising:
- an upconverter configured to frequency convert an input signal to an intermediate frequency signal in a frequency band greater than at least a portion of an input signal frequency band;
- a downconverter coupled to the upconverter and configured to frequency convert the intermediate frequency signal to a baseband signal;
- and
- a filter coupled to the downconverter and configured to filter the baseband signal.
A receiver comprising:
- a first upconverter configured to upconvert a desired RF signal to a first Intermediate Frequency (IF) that is greater than a frequency of the desired RF signal;
- a filter coupled to the upconverter and configured to perform band selection filtering of a signal output by the upconverter to generate a filtered upconverted signal;
- a quadrature direct downconverter configured to downconvert a desired signal in the filtered upconverted signal to in-phase and quadrature signal components;
- a first filter coupled to the quadrature direct downconverter and configured to perform channel selection filtering on the in-phase signal component;
- a second filter coupled to the quadrature direct downconverter and configured to perform channel selection filtering on the quadrature signal component;
- a second upconverter coupled to the first and second filters and configured to upconvert the filtered in-phase and quadrature signal components to in-phase and quadrature output IF signal components;
- and
- a signal combiner coupled to the second upconverter and configured to combine the in-phase and quadrature output IF signal components.
A method of processing a received signal, the method comprising:
- upconverting a desired input signal to a first intermediate frequency (IF) signal at a frequency greater than a frequency of the desired input signal;
- downconverting the first IF signal to a baseband signal;
- and
- performing channel selection on the baseband signal.
A method of processing a received signal, the method comprising:
- selecting a desired television signal at a desired RF channel;
- upconverting the desired television signal to a first Intermediate Frequency (IF) that is greater than a frequency of the desired RF channel;
- direct downconverting the desired television signal from the first IF to in-phase and quadrature signal components;
- performing channel selection filtering on each of the in-phase and quadrature signal components;
- upconverting the in-phase and quadrature signal components to second IF in-phase and quadrature signal components at a desired second IF;
- and
- combining the second IF in-phase and quadrature signal components to generate the desired television signal at the second IF.
Dependencies are inferred from the claim text.