公开(公告)号：US20050094743A1

公开(公告)日：2005-05-05

申请号：US10701978

申请日：2003-11-04

申请人： Shlomo Rakib ,  Oren Arad ,  Robert Fanfelle

发明人： Shlomo Rakib ,  Oren Arad ,  Robert Fanfelle

IPC分类号： H03C3/40 ,  H04L27/00 ,  H04L27/36 ,  H04L27/12

CPC分类号： H04L27/364 ,  H03C3/40 ,  H04L2027/0016 ,  H04L2027/0018

摘要： A signal transmitter for sending a radio signal is made up of an input for receiving input data and a first circuit for generating an inphase signal and a quadrature signal from the input data. A second circuit produces a first signal associated with a cosine of a first frequency and a third circuit that produces a second signal associated with a sine of the first frequency. A first modulator, coupled to the first circuit and the second circuit, upconverts the inphase signal with the first signal and produces a first upconverted signal. A second modulator, coupled to the first circuit and the third circuit, upconverts the inphase signal with the second signal and produces a second upconverted signal. A third modulator, coupled to the first circuit and the second circuit, upconverts the quadrature signal with the first signal and produces a third upconverted signal. A fourth modulator, coupled to the first circuit and the third circuit, upconverts the quadrature signal with the second signal and produces a fourth upconverted signal. A fourth circuit, coupled to the first and fourth modulators, combines the first upconverted signal and the fourth upconverted signal into a first intermediate signal. A fifth circuit, coupled to the second and third modulators, combines an inverse of the second upconverted signal and the third upconverted signal into a second intermediate signal. A quadrature modulator, coupled to the fourth circuit and the fifth circuit, converts the first intermediate signal and the second intermediate signal to an output signal. The output signal has a component at a first sideband of a second frequency, the first sideband frequency offset from the second frequency by a first amount. A filter, coupled to the quadrature modulator, passes the first sideband, and filters the second frequency and a second sideband, the second sideband offset from the second frequency by the inverse of the first amount.