Dynamic tuning of an RFID receiver to achieve substantially maximum received signal strength

A method comprises:

• receiving, by an antenna of a tuning circuit of a radio frequency identification (RFID) receiver, an electromagnetic propagated radio frequency (RF) signal from an external transmitter, wherein the tuning circuit is coupled to the antenna and a variable capacitor;
• capturing, by a current field strength detector circuit of the RFID receiver, a first current response of the tuning circuit to received signal strength of the RF signal;
• varying, by the tuning circuit, the variable capacitor in a first tuning direction;
• capturing, by the current field strength detector circuit, a second current response of the tuning circuit to the received signal strength of the RF signal;
• comparing, by the current field strength detector circuit, the captured first current response to the captured second current response;
• and
• when the captured second current response is weaker than the captured first current response:
• varying, by the tuning circuit, the variable capacitor in a second tuning direction;
• and
• adjusting, by the tuning circuit, the variable capacitor in the second tuning direction until a substantially maximum received signal strength is reached.