Harmonic reject receiver architecture and mixer
DCFirst Claim
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1. A harmonic reject mixer comprising:
- a plurality of mixers, each mixer having a common radio frequency (RF) input;
a generator operable to generate a common local oscillation (LO) input signal;
a phase shifter having an input coupled to receive the common LO input signal and being operable to generate a plurality of phase shifted output signals based on the common LO input signal, the common LO input signal comprising a plurality of transitions during a period of each phase shifted output signal, wherein each of the plurality of phase shifted output signals is generated according to a respective transition of the plurality of transitions of the common LO input signal, where each distinct transition in the plurality of transitions corresponds to a phase of each phase shifted output signal in the plurality of phase shifted output signals and each of the phase shifted output signals is coupled to a LO input of a corresponding mixer of the plurality of mixers; and
a combiner having a plurality of inputs, each input coupled to an output of an associated mixer of the plurality of mixers, and configured to provide a combined intermediate frequency (IF) output.
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Abstract
Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection.
55 Citations
29 Claims
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1. A harmonic reject mixer comprising:
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a plurality of mixers, each mixer having a common radio frequency (RF) input; a generator operable to generate a common local oscillation (LO) input signal; a phase shifter having an input coupled to receive the common LO input signal and being operable to generate a plurality of phase shifted output signals based on the common LO input signal, the common LO input signal comprising a plurality of transitions during a period of each phase shifted output signal, wherein each of the plurality of phase shifted output signals is generated according to a respective transition of the plurality of transitions of the common LO input signal, where each distinct transition in the plurality of transitions corresponds to a phase of each phase shifted output signal in the plurality of phase shifted output signals and each of the phase shifted output signals is coupled to a LO input of a corresponding mixer of the plurality of mixers; and a combiner having a plurality of inputs, each input coupled to an output of an associated mixer of the plurality of mixers, and configured to provide a combined intermediate frequency (IF) output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of harmonic rejection mixing, the method comprising:
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generating a control signal; generating a plurality of distinct phased local oscillation (LO) signals based on the control signal, wherein the control signal comprises a plurality of transitions during a period of each distinct phased LO signal, wherein each of the plurality of distinct phased LO signals is generated according to a respective transition of the plurality of transitions of the control signal, where each distinct transition in the plurality of transitions corresponds to one of the plurality of distinct phased LO signals; mixing an input signal with each of the plurality of distinct phased LO signals to generate a plurality of mixed intermediate frequency (IF) output signals; and combining the plurality of mixed IF output signals to provide an IF mixer output. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A harmonic reject mixer comprising:
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a control generator operable to generate a control signal; an LO generator operable to generate a plurality of local oscillator (LO) signals based on the control signal, wherein the control signal comprises a plurality of transitions during a period of each distinct phased LO signal, wherein each of the plurality of LO signals is generated according to a respective transition of the plurality of transitions of the control signal; a plurality of mixing circuits operable to receive an input signal and the plurality of LO signals having different phases, wherein each distinct transition in the plurality of transitions corresponds to the phase of each LO signal in the plurality of LO signals, each of the mixing circuits being operable to receive a different one of the plurality of local oscillator signals and being adapted to; generate a product of the input signal and the received local oscillator signal; and scale the product according to a sinusoidal function having a phase associated with the received local oscillator signal; and an adder operable to combine a plurality of outputs from the plurality of mixing circuits. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification