US 8,913,693 B2 · Quadrature modulator balancing system

Abstract

A method of balancing a quadrature modulator includes exciting an in-phase input of the quadrature module and sweeping a phase of an injection signal through a range of degrees, and determining a plurality of in-phase DC components. The method further includes exciting a quadrature input of the quadrature module and sweeping a phase of the injection signal through the range of degrees, and determining a plurality of quadrature DC components. An in-phase sinusoidal equivalent of the plurality of in-phase DC components and a quadrature sinusoidal equivalent of the plurality of quadrature DC components may be determined. At least one correction factor that balances the quadrature modulator may be determined based on a comparison between the in-phase sinusoidal equivalent and the quadrature sinusoidal equivalent.

Claims18

Dependent claims

A quadrature modulator, comprising:

a local oscillator that generates an injection signal having an input phase that drives the quadrature modulator;
an in-phase input that receives an in-phase signal;
a quadrature input that receives a quadrature signal;
a DC component module in electrical communication with the local oscillator to perform at least one injection signal sweep that sweeps a phase of the injection signal through a range of degrees, the DC component module configured to determine a plurality of in-phase DC components in response to exciting the in-phase input and to determine a plurality of quadrature DC components in response to exciting the quadrature input,
wherein the DC component module determines an in-phase sinusoidal equivalent of the plurality of in-phase DC components and determines a quadrature sinusoidal equivalent of the plurality of quadrature DC components.

2 more elements

Dependencies are inferred from the claim text.

Quadrature modulator balancing system

Life of this patent

Quadrature modulator balancing system

Life of this patent

Abstract

Claims18