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 |
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.
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