APPARATUS AND METHODS FOR BIASING POWER AMPLIFIERS
First Claim
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1. A power amplifier system comprising:
- a power amplifier configured to amplify a radio frequency (RF) signal; and
a bias block for biasing the power amplifier, the bias block including a time-dependent signal generator configured to shape an enable signal of the power amplifier to generate a control current, a current amplifier configured to amplify the control current to generate a correction current, and a primary biasing circuit configured to generate a bias current for the power amplifier based at least partly on the correction current, the bias current configured to correct for a variation in gain of the power amplifier when the power amplifier is enabled.
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Abstract
Apparatus and methods for biasing a power amplifier are disclosed. In one embodiment, a method of biasing a power amplifier includes shaping an enable signal using a time-dependent signal generator to generate a control current, amplifying the control current using a current amplifier to generate a correction current, and generating a bias current for a power amplifier using a primary biasing circuit. The primary biasing circuit is configured to use the correction current to correct for a variation in gain of the power amplifier when the power amplifier is enabled.
26 Citations
28 Claims
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1. A power amplifier system comprising:
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a power amplifier configured to amplify a radio frequency (RF) signal; and a bias block for biasing the power amplifier, the bias block including a time-dependent signal generator configured to shape an enable signal of the power amplifier to generate a control current, a current amplifier configured to amplify the control current to generate a correction current, and a primary biasing circuit configured to generate a bias current for the power amplifier based at least partly on the correction current, the bias current configured to correct for a variation in gain of the power amplifier when the power amplifier is enabled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of biasing a power amplifier, the method comprising:
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shaping an enable signal using a time-dependent signal generator to generate a control current; amplifying the control current using a current amplifier to generate a correction current; and generating a bias current for a power amplifier using a primary biasing circuit, the primary biasing circuit configured to use the correction current to correct for a variation in gain of the power amplifier when the power amplifier is enabled. - View Dependent Claims (19, 20, 21, 22)
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23. A bias circuit for biasing a power amplifier, the bias circuit comprising:
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a time-dependent signal generator configured to shape an enable signal of the power amplifier to generate a control current; a current amplifier configured to amplify the control current to generate a correction current; and a primary biasing block configured to generate a bias current for the power amplifier based at least partly on the correction current, the bias current configured to correct for a variation in gain of the power amplifier when the power amplifier is enabled. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification