Current limiting circuit for rf power amplifier

The current limitation circuit, is provided with power control circuit ring RF power amplifier with. The circuit is suitable for sensing and feed-in PA terminal and second of bias current. Compare the second predetermined and a current of the bias current's claims sensing support, and when the bias current of the sensor is at super-junction reference current, feeding into the power control loop the signal, wherein the printed with the PA output power. The provides usually power line voltage and temperature exchange insensitive PA to the current limitation is disposed. A line, for increasing the second circuit to limit movement of the current of PA disposed. The second circuit comprises a high precision VI converters, suitable for power control circuit ring voltage feedback of voltage VLIM and predetermined reference voltage VBGAP and comparison. Circuit and VI converter operation connection, and expressing feedback voltage voltage VLIM super-junction reference voltage VBGAP to average current output Iout. With it detection and a an existing a power control loop for high-voltage circuit further comprises compare the lower mismatch state; the two circuit is compressed to limit the antenna lower mismatch state of the power supply according PA disposed.