Radio frequency power amplifier adaptive bias control circuit
First Claim
1. An adaptive bias control circuit for use with a radio frequency (RF) power amplifier, said RF power amplifier having an input for receiving an input signal having a varying amplitude, an output, a first transistor, and a plurality of operating performance characteristics responsive to a quiescent operating point established by a bias current in the RF power amplifier, said bias control circuit comprising:
- a first circuit coupled to said RF power amplifier for receiving a portion of said input signal; and
a second transistor for generating a rectified signal from said portion of the input signal, said rectified signal for causing said bias current to be controlled as a function of the amplitude of the input signal, said second transistor having a first and second terminal connected together and coupled to said first circuit and a third terminal coupled to a ground potential.
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Accused Products
Abstract
An adaptive bias control circuit for use with a radio frequency (RF) power amplifier, the RF power amplifier having an input (112) for receiving an input signal having a varying amplitude, an output (116), a first transistor (110), and a plurality of operating performance characteristics responsive to a quiescent operating point established by a bias current in the RF power amplifier, the bias control circuit having: a first circuit (120) coupled to the RF power amplifier for receiving a portion of the input signal; and a second transistor (122) for generating a rectified signal from the portion of the input signal, the rectified signal for causing the bias current to be controlled as a function of the amplitude of the input signal, the second transistor having a first and second terminal connected together and coupled to the first circuit and a third terminal coupled to a ground potential.
62 Citations
12 Claims
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1. An adaptive bias control circuit for use with a radio frequency (RF) power amplifier, said RF power amplifier having an input for receiving an input signal having a varying amplitude, an output, a first transistor, and a plurality of operating performance characteristics responsive to a quiescent operating point established by a bias current in the RF power amplifier, said bias control circuit comprising:
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a first circuit coupled to said RF power amplifier for receiving a portion of said input signal; and
a second transistor for generating a rectified signal from said portion of the input signal, said rectified signal for causing said bias current to be controlled as a function of the amplitude of the input signal, said second transistor having a first and second terminal connected together and coupled to said first circuit and a third terminal coupled to a ground potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An adaptive bias control circuit for use with a radio frequency (RF) power amplifier, said RF power amplifier having an input for receiving an input signal having a varying amplitude, an output, a first transistor, and a plurality of operating performance characteristics responsive to a quiescent operating point established by a bias current in the RF power amplifier, said bias control circuit comprising:
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a first circuit coupled to said RF power amplifier for receiving a portion of said input signal; and
a second transistor for generating a rectified signal from said portion of the input signal, said rectified signal for causing said bias current to be controlled as a function of the amplitude of the input signal, said second transistor having a first and second terminal connected together and coupled to said first circuit and a third terminal coupled to a ground potential, wherein said RF power amplifier is housed in an integrated circuit (IC) chip, and the second transistor is also housed in said IC chip for causing said first and second transistors to have essentially the same electrical and thermal characteristics.
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12. A radio frequency (RF) power amplifier network for use in a communications device comprising:
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an RF power amplifier configured for exhibiting a plurality of operating performance characteristics responsive to a quiescent operating point established by a bias current in the RF power amplifier, said RF power amplifier comprising an input for receiving an input signal having a varying amplitude, an output, and a first transistor coupled between said input and output; and
an adaptive bias control circuit comprising a first circuit coupled to said RF power amplifier for receiving a portion of said input signal, and a second transistor for generating a rectified signal from said portion of the input signal, said rectified signal for causing said bias current to be controlled as a function of the amplitude of the input signal, said second transistor having a first and second terminal connected together and coupled to said first circuit and a third terminal coupled to a ground potential.
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Specification