Envelope restoration scheme for linear high-efficiency power amplification
First Claim
1. An active switching circuit for providing a switched waveform input to a standard class E output load matching network in an amplifier, said circuit comprising:
- a switch in communication with said input;
a combining device receiving amplitude and phase information from a primary waveform, said amplitude and phase information being received independently from each other; and
wherein said combining device combines said amplitude and phase information to create a control signal, said control signal being used to control said switch to create a secondary waveform for input to said matching network.
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Abstract
A apparatus for providing a waveform as a switched input into an output matching network of a standard class E amplifier. The apparatus includes a switch in communication with the input and the combining device receiving amplitude and phase information from the primary waveform. The combining device functions to combine the amplitude and phase information to create a control signal which is used to control the switch and create a secondary waveform for input to the matching network. In this way, an amplitude modulated waveform is amplified at high efficiency, enabling application of either all or part of the phase and/or amplitude modulation at the input of the amplifier.
112 Citations
29 Claims
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1. An active switching circuit for providing a switched waveform input to a standard class E output load matching network in an amplifier, said circuit comprising:
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a switch in communication with said input;
a combining device receiving amplitude and phase information from a primary waveform, said amplitude and phase information being received independently from each other; and
wherein said combining device combines said amplitude and phase information to create a control signal, said control signal being used to control said switch to create a secondary waveform for input to said matching network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
a low-pass filter for receiving amplitude information from a primary waveform; and
a high-pass filter receiving phase information from said primary waveform;
said low-pass and high-pass filters sharing a common output in communication with said switch;
wherein said amplitude information is passed through said low-pass filter, said phase information is passed through said high-pass filter, and said amplitude and phase information are combined at said common output.
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5. The circuit of claim 1 wherein said combining device further comprises a multiplying device for combining said amplitude and phase information by multiplying said amplitude and phase information to form said control signal.
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6. The circuit of claim 1 further comprising a digital signal processing device in communication with said combining device, wherein said digital signal processing device adjusts said amplitude information before it is received into said combining device to correct for distortion in said amplitude information.
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7. The circuit of claim 1 further comprising:
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a digital signal processing device in communication with said combining device; and
a feedback loop for sensing VSWR reflection from an antenna in communication with said amplifier, said feedback loop in communication with said digital signal processing device;
wherein said digital signal processing device adjusts said amplitude information before it is received into said combining device to correct for said VSWR reflection.
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8. An active switching circuit for providing a switched input to a standard class E output load matching network in an amplifier, said circuit comprising:
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a switch in communication with said matching network;
a low-pass filter receiving amplitude information from a primary waveform; and
a high-pass filter receiving phase information from said primary waveform;
said low-pass and high-pass filters sharing a common output in communication with said switch;
wherein said amplitude and phase information combine at said common output to control said switch to create a secondary waveform for input to said matching network. - View Dependent Claims (9, 10, 11, 12)
a digital signal processing device in communication with said low-pass filter; and
a feedback loop for sensing VSWR reflection from an antenna in communication with said amplifier, said feedback loop in communication with said digital signal processing device;
wherein said digital signal processing device adjusts said amplitude information before it is received into said low-pass filter to correct for said VSWR reflection.
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13. An active switching circuit for providing a switched input into a standard class E output load matching network in a class E amplifier, said circuit comprising:
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a switch in communication with said matching network; and
a multiplying device receiving amplitude and phase information from a primary waveform, said amplitude and phase information being received independently from each other;
wherein said multiplying device multiplies said amplitude and phase information to create a control signal, said control signal being used to control said switch to create a secondary waveform for input to said matching network. - View Dependent Claims (14, 15, 16, 17)
a digital signal processing device in communication with said multiplying device; and
a feedback loop for sensing VSWR reflection from an antenna in communication with said amplifier, said feedback loop in communication with said digital signal processing device;
wherein said digital signal processing device adjusts said amplitude information before it is received into said multiplying device to correct for said VSWR reflection.
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18. A method for converting a waveform into a switched input to a standard class E output load matching network in a class E amplifier, said method comprising the steps of:
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separating phase and amplitude information from a primary waveform;
receiving said amplitude and phase information into a combining device;
combining said amplitude and phase information to create a control signal;
controlling an electric current through a switch in response to said control signal to create a secondary waveform; and
providing said secondary waveform as an input to said matching network. - View Dependent Claims (19, 20, 21, 22, 23, 24)
a low-pass filter for receiving amplitude information from a primary waveform; and
a high-pass filter receiving phase information from said primary waveform;
said low-pass and high-pass filters sharing a common output in communication with said switch;
wherein said amplitude information is passed through said low-pass filter, said phase information is passed through said high-pass filter, and said amplitude and phase information are combined at said common output.
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22. The method of claim 18 wherein said combining device further comprises a multiplying device for combining said amplitude and phase information by multiplying said amplitude and phase information to form said control signal.
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23. The method of claim 18 further comprising the step of adjusting said amplitude information before it is received into said combining device to correct for distortion in said amplitude information.
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24. The method of claim 18 further comprising the steps of:
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a digital signal processing device in communication with said combining device; and
sensing VSWR reflection from an antenna in communication with said amplifier; and
adjusting said amplitude information before it is received into said combining device to correct for said VSWR reflection.
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25. A method for providing a waveform for input to an matching network, said method comprising the steps of:
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separating phase and amplitude information from a primary waveform;
passing said amplitude information through a low-pass filter;
passing said phase information through a high-pass filter;
combining said amplitude and phase information to create a control signal;
controlling an electric current through a switch in response to said control signal to create a secondary waveform; and
providing said secondary waveform as an input to said matching network. - View Dependent Claims (26, 27, 28, 29)
the steps of a digital signal processing device in communication with said low-pass filter; and
sensing VSWR reflection from an antenna in communication with said amplifier; and
adjusting said amplitude information before it is received into said low-pass filter to correct for said VSWR reflection.
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Specification