Edge combining sub-harmonic N-path filter
AssigneeIntel Corporation
InventorsRun Levinger, Soumya Gupta, Sashank Krishnamurthy, Ashoke Ravi, Ofir Degani
Life of this patent
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Abstract
A filter includes a plurality of filtering paths. The plurality of filtering paths is driven by a corresponding plurality of local oscillator (LO) signals associated with an LO frequency. Each of the LO signals has a phase of a plurality of phases. Each filtering path of the plurality of filtering paths includes a plurality of signal generation branches. The plurality of signal generation branches is configured to receive a harmonic LO signal based on a fraction of the LO frequency, and generate an LO signal of the corresponding plurality of LO signals associated with the LO frequency using the harmonic LO signal.
Claims20
A band-pass filter comprising:
- a plurality of filtering paths, the plurality of filtering paths being driven by a corresponding plurality of local oscillator (LO) signals associated with an LO frequency, each of the LO signals having a phase of a plurality of phases;
- and
- each filtering path of the plurality of filtering paths comprising a plurality of signal generation branches, the plurality of signal generation branches configured to receive a harmonic LO signal based on a fraction of the LO frequency, and generate an LO signal of the corresponding plurality of LO signals associated with the LO frequency using the harmonic LO signal.
An apparatus for a wireless device, the apparatus comprising:
- a frequency synthesizer;
- and
- radio front-end (RFE) circuitry coupled to the frequency synthesizer, the RFE circuitry including an N-path filter, the N-path filter comprising a plurality of filtering paths being driven by a corresponding plurality of local oscillator (LO) signals associated with an LO frequency, each filtering path of the plurality of filtering paths comprising a plurality of signal generation branches, the plurality of signal generation branches in the filtering path configured to:
- receive a harmonic LO signal generated by the frequency synthesizer, the harmonic LO signal based on a fraction of the LO frequency;
- and
- generate an LO signal of the corresponding plurality of LO signals associated with the LO frequency using the harmonic LO signal.
A downconversion mixer comprising:
- a plurality of filtering paths, each filtering path of the plurality of filtering paths comprising a switch and a capacitor, the plurality of filtering paths being driven by a corresponding plurality of local oscillator (LO) signals associated with an LO frequency, each of the LO signals having a phase of a plurality of non-overlapping phases spaced at substantially 900 apart from each other;
- wherein each filtering path of the plurality of filtering paths comprising a plurality of signal generation branches;
- wherein each signal generation branch of the plurality of signal generation branches of the filtering path comprising two switches coupled in series with each other;
- and
- wherein the plurality of signal generation branches is configured to:
- receive a harmonic LO signal based on a fraction of the LO frequency;
- generate an LO signal of the corresponding plurality of LO signals associated with the LO frequency using the harmonic LO signal, and downconvert an input radio frequency (RF) signal received by the switch of the filtering path;
- and
- provide a downconverted signal corresponding to the input RF signal at an input of the capacitor of the filtering path.
Dependencies are inferred from the claim text.