Patent ID: 8923779
Filing Date: 2014-12-30
Classification: H01Q,H04B

Abstract:
1. A handheld device comprising: a receiver circuitry that receives RF signals and determines the received signal strength indication (RSSI) of the RF signals; and an antenna auto-tune circuitry that receives the RSSI, the antenna auto-tune circuitry being configured to adjust a value of at least one of its electrical component based on the RSSI during the reception of the RF signals, wherein the antenna auto-tune circuitry tunes an antenna for receiving RF signals by first disabling the receiver circuitry and enabling a transmitter circuitry and a peak detector circuitry, the antenna auto-tune circuitry being configured to adjust the value of at least one of its electrical component based on the voltage output of the peak detector circuitry during the transmission of the RF signals by the transmitter circuitry, once the antenna is tuned, the antenna auto-tune circuitry being configured to disable the transmitter circuitry and peak detector circuitry and enable the receiver circuitry for receiving RF signals and/or tuning the antenna to the receiver circuitry, wherein the peak detector circuitry includes a variable serial resistor and an analog-to-digital converter (ADC), the variable serial resistor being configured to receive and send the transmitting RF signals from the transmitter circuitry to the peak detector circuitry, which determines the voltage output of the transmitting RF signals, the ADC being configured to convert the voltage output to a digital signal and send the converted digital signal to the antenna auto-tune circuitry, the antenna auto-tune circuitry being further configured to adjust the variable serial resistor based on the converted digital signal.