Systems and methods for tuning an antenna for a frequency modulation transceiver

摘要

Systems and methods for tuning an antenna for a frequency modulation (FM) transceiver are provided. A representative system includes: a network of electrical adjustable passive components that receives and sends radio frequency (RF) signals to a receiver circuitry via the network of electrical adjustable passive components. The receiver circuitry determines the received signal strength indication (RSSI) of the RF signal. The system further includes a transmitter circuitry that transmits RF signals via the network of electrical adjustable passive components, and a peak detector circuitry that receives and determines a voltage output of the RF signals from the variable capacitors. An auto-tune circuitry receives the RSSI and output value from the receiver circuitry and the peak detector circuitry, respectively. The auto-tune circuitry is configured to adjust capacitance values of at least one of the serial variable capacitor and the parallel variable capacitor based on the RSSI and the voltage output during the reception and transmission of the RF signals, respectively.

主权项

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.