Patent ID: 9647706
Date: 2017-05-09
CPC Classifications: H03H,H04B

Claim:
1. A system, including an antenna, for tuning an impedance network for optimal signal strength, the system comprising: a radio frequency (RF) receiver; a digital to analog converter (DAC); a received signal strength indicator (RSSI) coupled to the RF receiver; a controller coupled to the RSSI and the DAC, wherein the controller is configured to output a control signal based on a comparison of a RSSI value measured by the RSSI and another previously-provided RSSI value, wherein the control signal is inputted into the DAC to produce an analog signal to change capacitance of a varicap, wherein the controller is configured to receive the RSSI value from the RSSI at preset intervals and store the RSSI value, wherein when a new RSSI value is received the controller compares if the new RSSI value is lower or higher than the stored RSSI value and if the new RSSI value is higher than the stored RSSI value, the controller is configured to store to replace the stored RSSI value by the new RSSI value and not to output the control signal and if the stored RSSI value is lower than the new RSSI value, the controller is configured to output the control signal; and a tunable matching circuit, including the varicap and responsive to the analog signal, configured to provide impedance matching for signals between the antenna and the RF receiver.