Abstract: A power amplifier protection system to sense one or more operating conditions of a power amplifier and regulate the power of the input signal to the power amplifier as a response to one or more of the sensed operating conditions. This dynamic protection system may protect a power amplifier from failure by monitoring such operating conditions as power output and temperature and reducing the amplitude of the input signal if the power amplifier is operating beyond specified levels.

Abstract: Method and apparatus for power control in an RF amplifier having reduced noise and moderate gain slope. In one embodiment, a multistage RF amplifier includes a first stage having a transconductance amplifier with an output coupled to a variable gain amplifier, with the gain control including control of the collector-emitter voltage of the output transistor of the variable gain amplifier. In another embodiment, the variable gain amplifier is replaced with a single transistor, with the gain control including control of the collector-emitter voltage of the single transistor. Reduction of the collector-emitter voltage followed by a reduction in the base-emitter voltage of the second stage for reduced gain of the amplifier reduces noise in the amplifier output for reduced gains, typically providing a monotonically decreasing noise with gain reduction.

Abstract: A method and apparatus for improved power control of a radio frequency power amplifier achieved by limiting the maximum power of the radio frequency signal and varying the power of the radio frequency signal according to one or more power control feedback signals. In particular, the maximum power is limited by limiting the average current of the RF signal to a predetermined maximum value, despite the changing amplitude of the RF signal, thereby limiting the power of the radio signal and preventing the power control signals to the power varying circuit from being overwhelmed and/or maintaining stability.

Abstract: A power amplifier protection system to sense one or more operating conditions of a power amplifier and regulate the power of the input signal to the power amplifier as a response to one or more of the sensed operating conditions. This dynamic protection system may protect a power amplifier from failure by monitoring such operating conditions as power output and temperature and reducing the amplitude of the input signal if the power amplifier is operating beyond specified levels.

Abstract: A power amplifier protection system to sense one or more operating conditions of a power amplifier and regulate the power of the input signal to the power amplifier as a response to one or more of the sensed operating conditions. This dynamic protection system may protect a power amplifier from failure by monitoring such operating conditions as power output and temperature and reducing the amplitude of the input signal if the power amplifier is operating beyond specified levels.