Harmonic rejection mixer
AssigneeSilicon Laboratories Inc.
InventorsDaniel J. Cooley, Aslamali A. Rafi
Life of this patent
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Abstract
A technique includes providing a plurality of local oscillator signals such that each of the local oscillator signals has a different phase. The technique includes providing scaling units to scale the input signal pursuant to different scaling factors to generate scaled input signals. The scaling factors are selected on a periodic function of the phases. The technique also includes providing mixing circuits to mix the local oscillator signals with the scaled input signals to generate mixed signals and providing an adder to combine the mixed signals to generate an output signal.
Claims21
A method comprising:
- providing a plurality of local oscillator signals, each of the local oscillator signals having a different phase;
- providing scaling units to scale an input signal pursuant to different scaling factors to generate scaled input signals;
- selecting the scaling factors based on a periodic function of the phases;
- providing mixing circuits to mix the local oscillator signals with the scaled input signals to generate mixed signals;
- and
- providing an adder to combine the mixed signals to generate an output signal.
A mixer comprising:
- a plurality of mixing circuits to receive an input signal and local oscillator signals having different phases, each of the mixing circuits to receive a different one of the local oscillator signals and being adapted to:
- apply a scaling factor to the input signal to generate a scaled input signal, the scaling factor being based on the value of a periodic function of the phases for the phase of the received local oscillator signal;
- and
- generate an amplitude modulated mixed signal indicative of a product of the scaled input signal and the local oscillator signal;
- and
- an adder to combine the amplitude modulated mixed signals generated by the mixing circuits to provide an output signal.
A system comprising:
- AM and FM receive paths, at least one of the AM and FM receive paths comprising:
- an oscillator to generate a plurality of periodic signals having different phases;
- and
- a mixer to translate a frequency of the modulated signal, the mixer comprising:
- mixing circuits adapted to:
- based on a periodic function of the phases, scale the modulated signal by different degrees to generate scaled signals;
- and
- mix the scaled signals with the local oscillator signals to generate mixed signals;
- and
- an adder to combine the mixed signals to provide an output signal.
Dependencies are inferred from the claim text.