Automatic bias control circuit for linear power amplifiers
First Claim
1. An amplification module comprising:
- a power amplifier configured to receive an RF input signal and provide an RF output signal;
an autobias control circuit configured to receive and convert said RF output signal to a control signal;
a bias circuit coupling said control signal to a bias input of said power amplifier;
wherein said control signal causes said power amplifier to have a quiescent current that increases substantially linearly in response to an increase in RF output power of said RF output signal.
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Accused Products
Abstract
According to an exemplary embodiment, an amplification module includes a power amplifier configured to receive an RF input signal and provide an RF output signal. The amplification module further includes an autobias control circuit configured to receive and convert the RF output signal to a control signal. The control signal can cause the power amplifier to have a quiescent current that increases substantially linearly in response to an increase in the RF output power of the RF output signal. The autobias control circuit can include a peak detector/log converter circuit coupled to a first input of a differential amplifier, where the differential amplifier outputs the control signal. The autobias control circuit can further include a DC reference circuit coupled to a second input of the differential amplifier. The amplification module further includes an analog bias circuit coupling the control voltage to a bias input of said power amplifier.
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Citations
20 Claims
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1. An amplification module comprising:
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a power amplifier configured to receive an RF input signal and provide an RF output signal;
an autobias control circuit configured to receive and convert said RF output signal to a control signal;
a bias circuit coupling said control signal to a bias input of said power amplifier;
wherein said control signal causes said power amplifier to have a quiescent current that increases substantially linearly in response to an increase in RF output power of said RF output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An autobias control circuit comprising:
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a peak detector/log converter circuit, said peak detector/log converter circuit being configured to receive an RF output signal and convert said RF output signal to a first DC voltage;
a differential amplifier coupled to said peak detector/log converter circuit, said differential amplifier being configured to receive said first DC voltage at a first input and output a control voltage;
wherein said control voltage causes a power amplifier to have a quiescent current that increases substantially linearly in response to an increase in RF output power of said RF output signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification