Envelope modulated amplifier bias control and method
First Claim
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1. A method of reducing the power requirements for Class A operation of a RF amplifier comprising the steps of:
- (a) sensing the envelope of the RF signal being amplified; and
(b) modifying the power consumed by the amplifier by modifying the amplifier bias current in response to the sensed envelope.
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Abstract
A RF amplifier and method wherein the bias current is varied dynamically as a function of the envelope of the RF modulation to increase the efficiency and improve the linearity of the amplifier. Alternatively, the supply voltage may be dynamically varied as a function of modulation envelope.
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Citations
10 Claims
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1. A method of reducing the power requirements for Class A operation of a RF amplifier comprising the steps of:
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(a) sensing the envelope of the RF signal being amplified; and (b) modifying the power consumed by the amplifier by modifying the amplifier bias current in response to the sensed envelope. - View Dependent Claims (2, 3, 4)
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5. A method of improving the linearity for Class C operation of a RF amplifier comprising the steps of:
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(a) sensing the envelope of the RF signal being amplified; and (b) modifying the power consumed by the amplifier by modifying the amplifier bias current in response to the sensed envelope.
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6. A method of dynamically biasing a RF amplifier comprising the steps of:
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(a) sensing the envelope of the RF signal being amplified; and (b) modifying the power consumed by the amplifier by modifying the amplifier bias current in response to the sensed envelope.
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7. A method of reducing power consumption in an RF amplifier comprising the steps of:
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(a) sensing the envelope of the RF signal being amplified; and (b) modifying the power applied to the amplifier by modifying the amplifier a bias current in response to the sensed envelope.
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8. In an RF amplifier having an input terminal, an output terminal, bias and a source of power:
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means for sensing the envelope of the RF signal applied to the input terminal; means for modifying the power applied to the amplifier responsive to said sensing means, said means for modifying including a means for varying the bias current of the amplifier. - View Dependent Claims (9, 10)
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Specification