SIGNAL GENERATOR WITH IMAGE REJECTION

摘要

A method and apparatus are disclosed for generating a quadrature signal that may be used to modulate and/or demodulate communication signals transmitted between communication devices. A quadrature signal generator may include a control block, a mixer, and a filter. The control block may generate a reference signal and a filter control signal based on an input clock signal. The mixer may generate a mixer output signal based on the input clock signal and the reference signal. The filter, controlled by the filter control signal, may filter the mixer output signal to suppress a band of frequencies within the mixer output signal.

主权项

1. A quadrature signal generator, comprising:
a control block to generate a reference signal and a filter control signal, the filter control signal having a number N of individual control signals based, at least in part, on an input clock signal, wherein the number N is greater than one; a mixer, coupled to the control block, to generate a mixer output signal based, at least in part, on the input clock signal and the reference signal; and a filter, coupled to the mixer and the control block, to filter the mixer output signal and to generate a filter output signal based, at least in part, on the filter control signal.