Biasing methods and devices for power amplifiers
First Claim
Patent Images
1. A biasing method comprising the steps of:
- providing an amplifier having an amplifier input and an amplifier output;
tapping the amplifier output to generate an AC voltage;
rectifying the AC voltage to generate a rectified voltage, anddividing the rectified voltage to produce one or more bias voltages to bias the amplifier.
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Abstract
Biasing methods and devices for power amplifiers are described. The described methods and devices use the power amplifier output voltage to generate bias voltages. The bias voltages are obtained using rectifiers and voltage dividers. The described biasing methods and devices can be used with class-E power amplifiers.
31 Citations
60 Claims
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1. A biasing method comprising the steps of:
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providing an amplifier having an amplifier input and an amplifier output; tapping the amplifier output to generate an AC voltage; rectifying the AC voltage to generate a rectified voltage, and dividing the rectified voltage to produce one or more bias voltages to bias the amplifier. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A biasing method for class-E power amplifiers comprising the steps of:
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providing a class-E power amplifier comprising a plurality of MOSFET devices adapted operate in an ON state or an OFF state, wherein the class-E power amplifier has an output that is coupled to a load network; generating an amplifier output voltage at the amplifier output; providing a biasing capacitance receiving the amplifier output voltage at one end and generating an AC voltage at another end; generating a resonance condition through a combination of the biasing capacitance with the load network when the plurality of MOSFET devices are in the OFF state, and rectifying the AC voltage to generate one or more bias voltages to the class-E power amplifier. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A bias circuit connectable, during operation, to a power amplifier comprising a plurality of MOSFET devices to produce a power amplifier AC output voltage at a power amplifier output, the bias circuit comprising:
a rectifier, the rectifier having a rectifier DC voltage output and rectifying an AC voltage originated from the power amplifier AC output voltage to a DC voltage at the rectifier DC voltage output, the DC voltage being input, during operation, to one or more gate terminals of the MOSFET devices of the power amplifier. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A bias circuit connectable, during operation, to a power amplifier comprising a plurality of MOSFET devices to produce a power amplifier AC output voltage at a power amplifier output, the bias circuit comprising:
one or more rectifiers to rectify the power amplifier AC output voltage to generate one or more bias outputs. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. An RF power amplifier for amplifying an input signal comprising:
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an amplifier input; an amplifier output; a reference node; a first inductor adapted to connect the amplifier output to a power supply; a plurality of devices arranged in a cascode configuration between the amplifier output and the reference node; an output capacitor connected between the amplifier output and the reference node; an output resonant circuit comprising a second inductor connected in series with a capacitor, the output resonant circuit being connected at one end to the amplifier output and connectable at another end to a load; a bias circuit comprising; an RF voltage divider having an RF voltage divider output, the RF voltage divider being connected with the amplifier output on one side and with a shunt capacitor on another side, the shunt capacitor connecting the RF voltage divider to the reference node; a rectifier circuit having a rectifier circuit output, the rectifier circuit being connected with the RF voltage divider output on one side and with the reference node on another side; a DC voltage divider comprising a DC voltage divider first end, a DC voltage divider second end and two or more DC voltage divider outputs, wherein output and the DC voltage divider second end is connected to the reference node. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. An RF power amplifier for an amplifying an input signal comprising:
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an amplifier input; an amplifier output; a reference node; a first inductor adapted to connect the amplifier output to a power supply; a plurality of amplifying devices arranged in a cascode configuration between the amplifier output and the reference node; an output capacitor connected between the amplifier output and the reference node; an output resonant circuit comprising a second inductor connected in series with a capacitor, the output resonant circuit being connected at one end to the amplifier output and connectable at another end to a load; a bias circuit comprising; a plurality of RF voltage dividers generating a plurality of RF voltage divider outputs;
each RF voltage divider having an RF voltage divider first side and an RF voltage divider second side, the RF voltage divider first side being connected with the amplifier output and the RF voltage divider second side being connected with a shunt capacitor, the shunt capacitor connecting the plurality of the RF voltage dividers to the reference node; anda plurality of rectifier circuits generating a plurality of rectifier circuit outputs, and each rectifier circuit connecting a respective RF voltage divider output to the reference node. - View Dependent Claims (53, 54, 55, 56, 57, 58, 59, 60)
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Specification