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US 2014/0176217 A1Published application
Signal component rejection
AssigneeQUALCOMM Incorporated
InventorsSaihua Lin, Roger Brockenbrough
Life of this patent
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Abstract
A method includes providing a first local oscillator signal having a first duty cycle to a first mixer unit and providing a second local oscillator signal having a second duty cycle to a second mixer unit. At least one of the first duty cycle or the second duty cycle is greater than fifty percent. A frequency of the first local oscillator signal approximately equals a frequency of the second local oscillator signal. The method may also include generating a modulated output signal based on an output signal of the first mixer unit and based on an output signal of the second mixer unit.
Claims25
A method of signal generation comprising:
- generating, at a first mixer unit, a first mixer output signal based on a first local oscillator signal having a first duty cycle to a first mixer unit;
- providing a first scaled input signal to the first mixer unit, wherein the first scaled input signal is generated by scaling an input signal by a first gain factor;
- generating, at a second mixer unit, a second mixer output signal based on a second local oscillator signal having a second duty cycle to a second mixer unit;
- providing a second scaled input signal to the second mixer unit, wherein the second scaled input signal is generated by scaling the input signal by a second gain factor;
- providing a third local oscillator signal having a third duty cycle to a third mixer unit;
- providing a third scaled input signal to the third mixer unit, wherein the third scaled input signal is generated by scaling the input signal by a third gain factor;
- and
- generating a modulated output signal based on the first mixer output signal, the second mixer unit output signal, and a third mixer unit output signal.
5 more elements
(canceled)
(canceled)
A device comprising:
- a first mixer unit;
- a second mixer unit;
- and
- a third mixer unit,
- wherein the first mixer unit is configured to receive a first local oscillator signal having a first duty cycle,
- wherein the second mixer unit is configured to receive a second local oscillator signal having a second duty cycle,
- wherein the third mixer unit is configured to receive a third local oscillator signal having a third duty cycle,
- wherein a modulated output signal is generated based on a first output signal of the first mixer unit, a second output signal of the second mixer unit, and a third output signal of the third mixer unit,
- wherein the first duty cycle is approximately 1/N,
- wherein the second duty cycle is approximately 2/N,
- wherein the third duty cycle is approximately 3/N,
- wherein a number of mixer units that generate output signals that are combined to generate the modulated output signal is N−1, and
- wherein N is an integer greater than 3.
10 more elements
(canceled)
An apparatus comprising:
- first means for scaling;
- second means for scaling;
- third means for scaling;
- first means for signal mixing;
- second means for signal mixing;
- and
- third means for signal mixing,
- wherein the first means for scaling is configured to generate a first scaled signal by scaling an input signal by a first gain factor,
- wherein the second means for scaling is configured to generate a second scaled signal by scaling the input signal by a second gain factor,
- wherein the third means for scaling is configured to generate a third scaled signal by scaling the input signal by a third gain factor,
- wherein the first means for signal mixing is configured to:
- receive the first scaled signal, and
- receive a first local oscillator signal having a first duty cycle,
- wherein the second means for signal mixing is configured to:
- receive the second scaled signal, and
- receive a second local oscillator signal having a second duty cycle,
- wherein the third means for signal mixing is configured to:
- receive the third scaled signal, and
- receive a third local oscillator signal having a third duty cycle, and
- wherein a modulated output signal is generated based on a first output signal of the first means for signal mixing, a second output signal of the second means for signal mixing, and a third output signal of the third means for signal mixing.
17 more elements
Dependencies are inferred from the claim text.