LINEARITY AND NOISE IMPROVEMENT FOR MULTILEVEL POWER AMPLIFIER SYSTEMS USING MULTI-PULSE DRAIN TRANSITIONS
First Claim
1. A radio frequency (RF) amplifier system comprising:
- at least one amplifier having an RF input port, an RF output port and a bias port;
at least one voltage modulator coupled to the bias port of the least one amplifier to provide a bias voltage, the bias voltage selected by switching among a plurality of discrete voltages;
at least one filter circuit coupled between the at least one voltage modulator and the at least one amplifier, the at least one filter circuit configured to control at least some spectral components resultant from transitions in the bias voltage when switching among the plurality of discrete voltages; and
a controller configured to dynamically adapt at least one setting of the at least one voltage modulator by using multi-pulse transitions when switching among the plurality of discrete voltages in a first operating condition of the RF amplifier.
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Accused Products
Abstract
Described embodiments provide a radio frequency (RF) amplifier system having at least one amplifier. The at least one amplifier includes an RF input port, an RF output port and a drain bias port. At least one voltage modulator is coupled to the bias port of the least one amplifier to provide a bias voltage. The bias voltage is selected by switching among a plurality of discrete voltages. At least one filter circuit is coupled between the at least one voltage modulator and the at least one amplifier. The at least one filter circuit controls spectral components resultant from transitions in the bias voltage when switching among the plurality of discrete voltages. A controller dynamically adapts at least one setting of the at least one voltage modulator by using multi-pulse transitions when switching among the plurality of discrete voltages for a first operating condition of the RF amplifier.
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Citations
28 Claims
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1. A radio frequency (RF) amplifier system comprising:
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at least one amplifier having an RF input port, an RF output port and a bias port; at least one voltage modulator coupled to the bias port of the least one amplifier to provide a bias voltage, the bias voltage selected by switching among a plurality of discrete voltages; at least one filter circuit coupled between the at least one voltage modulator and the at least one amplifier, the at least one filter circuit configured to control at least some spectral components resultant from transitions in the bias voltage when switching among the plurality of discrete voltages; and a controller configured to dynamically adapt at least one setting of the at least one voltage modulator by using multi-pulse transitions when switching among the plurality of discrete voltages in a first operating condition of the RF amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a radio frequency (RF) amplifier comprising at least one controller, at least one amplifier, at least one voltage modulator, and at least one filter, the method comprising:
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determining, by the at least one controller, one or more operating characteristics of the RF amplifier; switching, by the voltage modulator in response to the determining, a bias voltage of the at least one amplifier among a plurality of discrete voltages by using multi-pulse transitions. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A radio frequency (RF) amplifier system comprising:
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at least one amplifier having an RF input port, an RF output port and a drain bias port; at least one voltage modulator coupled to the bias port of the least one amplifier, each of the at least one voltage modulators operable to provide a selected bias voltage, the bias voltage selected by switching among a plurality of discrete voltages; and a controller configured to dynamically adapt at least one setting of the at least one voltage modulator by using multi-pulse transitions when switching among the plurality of discrete voltages to provide the selected bias voltage in a first operating condition of the RF amplifier. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification