US 6,983,024 B2
Quadra-polar modulator
Gary J. Ballantyne, Christchurch (New Zealand)
Assigned to Qualcomm Inc., San Diego, Calif. (US)
Filed on Mar. 18, 2003, as Appl. No. 10/392,042.
Prior Publication US 2004/0184559 A1, Sep. 23, 2004
Int. Cl. H04L 5/12 (2006.01)
U.S. Cl. 375—261 26 Claims
OG exemplary drawing
 
1. An integrated circuit comprising:
a first amplitude modulator operative to amplitude modulate a first carrier signal with a first input signal to provide a first output signal, wherein the phase of the first carrier signal is not inverted by the first input signal;
a second amplitude modulator operative to amplitude modulate a second carrier signal with a second input signal to provide a second output signal, wherein the first and second input signals are derived based on a first modulating signal, and wherein the chase of the second carrier signal is not inverted by the second input signal;
a third amplitude modulator operative to amplitude modulate a third carrier signal with a third input signal to provide a third output signal, wherein the phase of the third carrier signal is not inverted by the third input signal;
a fourth amplitude modulator operative to amplitude modulate a fourth carrier signal with a fourth input signal to provide a fourth output signal, wherein the third and fourth input signals are derived based on a second modulating signal, and wherein the phase of the fourth carrier signal is not inverted by the fourth input signal; and
a combiner operative to combine the first, second, third, and fourth output signals to provide a modulated signal, wherein the modulated signal comprises an inphase component formed by the first modulating signal and a quadrature component formed by the second modulating signal.