Patent ID: 8129949
Filing Date: 2012-03-06
Classification: H02J

Abstract:
1. A wireless communication device, comprising: a battery; a Radio Frequency Identification (RFID) transceiver, a Wireless Local Area Network (WLAN) transceiver, and a processor receiving power from the battery; and a bias controller operable to control power consumption of a power amplifier of the RFID transceiver, the bias controller including a bias control, a comparator for comparing the battery voltage input and a threshold voltage input, and a resistor divider connected with a shunt capacitor, a first resistor of the resistor divider disposed between the bias control and the power amplifier of the RFID transceiver and a second resistor of the resistor divider connected between the comparator and the power amplifier of the RFID transceiver, wherein the voltage of the battery is maintained above the threshold voltage by decreasing a current drawn from the battery by placing the RFID transceiver in a low current state by reducing the power consumption of the power amplifier of the RFID transceiver by the bias controller when the battery voltage approaches the threshold voltage, and if the battery voltage can not be maintained above the threshold voltage shutting down the RFID transceiver, the WLAN transceiver, and the processor.