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US 8,525,590 B2Granted
Power amplifier control circuit
AssigneeSkyworks Solutions, Inc.
InventorsChristophe M. Joly, Yue Chen, Shihui Xu
Life of this patent
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AssigneeSkyworks Solutions, Inc.
InventorsChristophe M. Joly, Yue Chen, Shihui Xu
Estimating the term…
This disclosure provides systems, apparatus, and methods for switching a portion of a power amplifier on and off during different modes of operation. In one aspect, a control circuit can include separate switches to provide bias currents to different portions of a power amplifier. The control circuit can include another switch to electrically connect outputs of the separate switches in a first mode of operation (for example, a high power mode) and electrically isolate the outputs of the separate switches in a second mode of operation (for example, a low power mode). In some implementations, a circuit element, such as a field effect transistor or a diode, can turn off one of the separate switches in the second mode. Alternatively or additionally, another circuit element, such as a field effect transistor or a diode, can prevent a power amplifier portion from turning on in the second mode.
A power amplifier system comprising:
A control circuit comprising:
A method of controlling a power amplifier, the method comprising:
An electronic system comprising an enable circuit including BiFET devices, the enable circuit configured to selectively provide current from a voltage source to a bias output based on an enable input, the enable circuit configured to pass substantially all of the current from the voltage source through one or more of the BiFET devices driving the bias output when the enable circuit is enabled.
Dependencies are inferred from the claim text.