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US 2002/0055337 A1Published application
Quadrature generator with image reject mixer
AssigneeQUALCOMM Incorporated
InventorsCharles J. Persico, James Jaffee, Steven C. Ciccarelli
Life of this patent
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Abstract
In an exemplary application, an apparatus according to a disclosed embodiment receives a radio frequency signal and outputs an intermediate frequency signal. Rejection of image components in the intermediate frequency signal is obtained without the need to preprocess the radio frequency signal with an image reject filter. Such an apparatus may also exhibit an image rejection performance that is robust to frequency deviation of a local oscillator.
Claims30
A converter comprising:
- an image reject mixer configured and arranged to receive an input signal and a quadrature signal pair and to produce an output signal based on the input signal and the quadrature signal pair;
- and
- a quadrature signal generator configured and arranged to receive a first oscillator signal and a second oscillator signal and to produce the quadrature signal pair,
- wherein each of the quadrature signal pair is based on both the first oscillator signal and the second oscillator signal.
1 more element
A method comprising:
- receiving a first oscillator signal and a second oscillator signal;
- producing a quadrature signal pair based on the first oscillator signal and the second oscillator signal;
- receiving an input signal;
- and
- producing an output signal based on the input signal and the quadrature signal pair,
- wherein each of the quadrature signal pair is based on both the first oscillator signal and the second oscillator signal.
3 more elements
An integrated circuit comprising:
- an image reject mixer configured and arranged to receive an input signal and a quadrature signal pair and to produce an output signal based on the input signal and the quadrature signal pair;
- and
- a quadrature signal generator configured and arranged to receive a first oscillator signal and a second oscillator signal and to produce the quadrature signal pair,
- wherein each of the quadrature signal pair is based on both the first oscillator signal and the second oscillator signal.
1 more element
A converter comprising:
- a generator configured and arranged to receive a first oscillator signal and a second oscillator signal and to output a quadrature signal pair having a frequency ωg;
- and
- an image reject mixer configured and arranged to receive the quadrature signal pair and an input signal including an information signal modulated onto a carrier having a bandwidth centered at a frequency ωc and to output an output signal,
- wherein each of the quadrature signal pair is based on both of the first oscillator signal and the second oscillator signal, and
- wherein at least one among a sum and a difference of the frequencies of the first oscillator signal and the second oscillator signal is ωg, and
- wherein the output signal includes the information signal modulated onto a carrier having a bandwidth centered at one among the frequencies (ωc−ωg) and (ωc+ωg), and
- wherein the image reject mixer is further configured and arranged to suppress a component in the input signal having the frequency (2ωg−ωc).
4 more elements
Dependencies are inferred from the claim text.