Quadrature signal generation in radio-frequency apparatus and associated methods
AssigneeSilicon Laboratories Inc.
InventorDonald A. Kerth
Life of this patent
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Abstract
A radio-frequency (RF) apparatus, which may reside in a receiver or transceiver, includes receive-path circuitry. The receive-path circuitry includes a poly-phase filter and a harmonic filter. The poly-phase filter accepts an input signal and generates two output signals. One output signal of the poly-phase filter constitutes an in-phase (I) signal. The other output signal of the poly-phase filter constitutes a quadrature (Q) signal. The a harmonic filter couples to the poly-phase filter. The harmonic filter accepts as input signals the in-phase and quadrature output signals of the poly-phase filter.
Claims29
A radio-frequency (RF) apparatus, comprising:
- receive-path circuitry, comprising:
- a poly-phase filter, the poly-phase filter configured to accept an input signal and provide a first in-phase signal and a first quadrature signal;
- and
- a harmonic filter coupled to the poly-phase filter, the harmonic filter configured to accept the first in-phase signal and the first quadrature signal.
A radio-frequency (RF) apparatus, comprising:
- receive-path circuitry, comprising:
- a harmonic filter, the harmonic filter configured to accept an input signal and to provide an output signal;
- and
- a poly-phase filter coupled to the harmonic filter, the poly-phase filter configured to accept the output signal of the harmonic filter.
A method of generating quadrature signals in a radio-frequency (RF) apparatus, the method comprising:
- filtering an input signal in a poly-phase filter;
- generating a first in-phase signal and a first quadrature signal;
- and
- filtering the first in-phase signal and the first quadrature signal in a harmonic filter.
Dependencies are inferred from the claim text.