Amplitude demodulators and related methods

A demodulator for demodulating an amplitude-modulated input signal received with an antenna, the demodulator comprising:

• control circuitry configured to:
• receive a detection signal generated with a matching network coupled to the antenna based on the amplitude-modulated input signal;
• and
• generate a demodulated output signal,
• wherein the circuitry is configured to generate the demodulated output signal at least in part by:
• detecting whether ringing in the detection signal occurs in a first time period;
• and
• when ringing in the detection signal is detected to occur in the first time period, setting the demodulated output signal to a first level during at least a portion of the first time.

A demodulator for demodulating an amplitude-modulated input signal received with an antenna, the demodulator comprising:

• an amplitude detector coupled to a matching network coupled to the antenna;
• a phase detector or a frequency detector coupled to the matching network;
• and
• a selector having a first input terminal coupled to the amplitude detector, a second input terminal coupled to the phase detector or the frequency detector, and a control terminal coupled to control circuitry.