Class D power amplifier
First Claim
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1. An apparatus comprising:
- a driver having an input, an output, and a parasitic capacitance, wherein the input of the driver is configured to receive complementary first and second radio frequency (RF) signals, and wherein there is a free-fly interval between consecutive pulses from the first and second RF signals, and wherein the parasitic capacitance of the driver creates switching losses;
an output capacitor that is coupled to the output of the driver;
a matching network that is coupled to the output capacitor; and
a cancellation circuit that is coupled to the output of the driver so as to provide harmonic restoration at least during the free-fly interval.
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Abstract
A class D power amplifier (PA) is provided. The PA generally comprises a driver, output capacitor, a matching network, and a cancellation circuit. The driver has an input, an output, and a parasitic capacitance, and the input of the driver is configured to receive complementary first and second radio frequency (RF) signals, where there is a free-fly interval between consecutive pulses from the first and second RF signals. The output capacitor and cancellation circuit are each coupled to the output of the driver such that the cancellation circuit provides harmonic restoration at least during the free-fly interval, and the matching network is coupled to the output capacitor.
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Citations
30 Claims
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1. An apparatus comprising:
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a driver having an input, an output, and a parasitic capacitance, wherein the input of the driver is configured to receive complementary first and second radio frequency (RF) signals, and wherein there is a free-fly interval between consecutive pulses from the first and second RF signals, and wherein the parasitic capacitance of the driver creates switching losses; an output capacitor that is coupled to the output of the driver; a matching network that is coupled to the output capacitor; and a cancellation circuit that is coupled to the output of the driver so as to provide harmonic restoration at least during the free-fly interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a first driver having an input, an output, and a parasitic capacitance, wherein the input of the first driver is configured to receive complementary first and second RF signals, and wherein there is a free-fly interval between consecutive pulses from the first and second RF signals; a second driver having an input, an output, and a parasitic capacitance, wherein the input of the second driver is configured to receive the first and second RF signals; an first output capacitor that is coupled to the output of the first driver; a second output capacitor that is coupled to the output of the second driver; a matching network that is coupled to each of the first and second output capacitors; and a cancellation circuit that is coupled to the output of at least one of the first and second drivers so as to provide harmonic restoration at least during the free-fly interval. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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a plurality of drivers, wherein each driver has an input, an output, and a parasitic capacitance, wherein the input of the each driver is configured to receive complementary first and second RF signals, and wherein there is a free-fly interval between consecutive pulses from the first and second RF signals; a plurality of output capacitor, wherein each output capacitor is coupled to the output of at least one of the drivers; a matching network that is coupled to each of the output capacitors; and a cancellation circuit that is coupled to the output of at least one of the drivers so as to provide harmonic restoration at least during the free-fly interval. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification