Linc transmitter with improved efficiency

An apparatus comprising:

• a signal generator that is configured to receive an input signal and that is configured to generate a plurality of sets of complementary RF signals;
• a plurality of drivers that are coupled to the signal generator, wherein each driver is configured to receive at least one of the sets of complementary RF signals;
• a plurality of restoration circuits, wherein each restoration circuit is coupled to at least one of the drivers;
• a bridge circuit that is coupled to each of the restoration circuits;
• and
• an output circuit that is coupled to each restoration network, wherein the plurality of restoration circuits and the bridge circuit provide a common mode impedance and a differential impedance, wherein the common mode impedance is lower than the differential impedance.

An apparatus comprising:

• a signal generator that is configured to receive an input signal and that is configured to generate first, second, third, and fourth RF signals, wherein the input signal has a variable envelope, and wherein the first and second RF signals are complementary, and wherein the third and fourth RF signals are complementary, and wherein there is a free-fly interval between consecutive pulses of the first, second, third, and fourth RF signals;
• a first driver having:
• a first transistor having a first passive electrode, a second passive electrode, and a control electrode, wherein the control electrode of the first transistor is coupled to the signal generator so as to receive the first RF signal;
• and
• a second transistor having a first passive electrode, a second passive electrode, and a control electrode, wherein the control electrode of the second transistor is coupled to the signal generator so as to receive the second RF signal, and wherein the first passive electrode of the second transistor is coupled to the second passive electrode of the first transistor at a first node;
• a second driver having:
• a third transistor having a first passive electrode, a second passive electrode, and a control electrode, wherein the control electrode of the third transistor is coupled to the signal generator so as to receive the third RF signal;
• and
• a fourth transistor having a first passive electrode, a second passive electrode, and a control electrode, wherein the control electrode of the fourth transistor is coupled to the signal generator so as to receive the fourth RF signal, and wherein the first passive electrode of the fourth transistor is coupled to the second passive electrode of the third transistor at a second node;
• a first restoration circuit that is coupled to the first node;
• a second restoration circuit that is coupled to the second node;
• an output circuit that is coupled to the first and second restoration circuits at third and fourth nodes, respectively;
• and
• a bridge circuit that is coupled to the third and fourth nodes, wherein the first restoration circuit, the second restoration circuit, and the bridge circuit provide a common mode impedance and a differential impedance, wherein the common mode impedance is lower than the differential impedance.