APPARATUS AND METHODS POWER AMPLIFIER BIASING
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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.
8 Citations
21 Claims
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1. (canceled)
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2. A mobile device comprising:
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a transceiver configured to generate a radio frequency (RF) signal and an enable signal having an enabled state and a disabled state; a power amplifier configured to amplify the RF signal; and a bias circuit configured to receive the enable signal and to generate a bias current that biases the power amplifier, the bias circuit configured to control a magnitude of the bias current based on the enable signal and to provide a transient boost to the magnitude of the bias current when the enable signal is transitioned from the disabled state to the enabled state to compensate for a variation in gain of the power amplifier from thermal effects. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of power amplifier biasing in a mobile device, the method comprising:
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generating a radio frequency (RF) signal and an enable signal using a transceiver; amplifying the RF signal using a power amplifier; biasing the power amplifier with a bias current from a bias circuit; controlling a magnitude of the bias current based on the enable signal; transitioning the enable signal from a disabled state to an enabled state; and providing a transient boost to the magnitude of the bias current in response to the transition to compensate for a variation in gain of the power amplifier from thermal effects. - View Dependent Claims (16)
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17. A power amplifier system comprising:
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a power amplifier configured to amplify a radio frequency (RF) signal, the power amplifier including a bias input that receives a bias current; and a bias circuit configured to receive an enable signal having an enabled state and a disabled state, the bias circuit configured to control a magnitude of the bias current based on the enable signal and to provide a transient boost to the magnitude of the bias current when the enable signal is transitioned from the disabled state to the enabled state to compensate for a variation in gain of the power amplifier from thermal effects. - View Dependent Claims (18, 19, 20, 21)
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Specification