Methods and apparatus for phase change detection using a resonator

A communications receiver comprising:

• an input to receive a phase modulated radio frequency (RF) input signal encoded with information;
• at least one microwave cavity resonator including discrete components that is coupled to the input and configured to receive the phase modulated RF input signal, to internally resonate signal energy in response to receiving the phase modulated RF input signal, and to produce an electrical output signal having a steady-state amplitude and amplitude variations, corresponding to deviations from the steady-state amplitude, that are representative phase transitions in the phase modulated RF input signal;
• and
• signal processing circuitry configured to receive and process the electrical output signal to produce a decoded information signal.

A communications receiver comprising:

• an input to receive a phase modulated radio frequency (RF) input signal encoded with information;
• a resonant circuit including discrete components that is coupled to the input and configured to receive the phase modulated RF input signal, the resonant circuit having an impedance corresponding to a reactance and a resistance of the discrete components, wherein a change in a voltage provided at an output of the resonant circuit is representative of a phase modulation of the phase modulated RF input signal;
• and
• signal processing circuitry coupled to the resonant circuit and configured monitor the change in the voltage to produce a decoded information signal.