Polar receiver system and method for Bluetooth communications

A configurable receiver configured to operate in a first mode and in a low power mode, the configurable receiver comprising:

• a phase detection circuit configured to receive a radio frequency signal and to determine a phase of the radio frequency signal;
• an amplitude detection circuit configured to, when the configurable receiver is operating in the first mode, receive the radio frequency signal and to determine an amplitude of the radio frequency signal;
• a mode control circuit coupled to the amplitude detection circuit and configured to, when the configurable receiver is operating in the low power mode, disable the amplitude detection circuit and to provide a predetermined constant value;
• and
• a coordinate rotation digital computer (CORDIC) logic circuit configured to receive the phase from the phase detection circuit, wherein the CORDIC logic circuit is configured to, when the configurable receiver is operating in the first mode, receive the amplitude from the amplitude detection circuit, and wherein the CORDIC logic circuit is configured to, when the configurable receiver is operating in the low power mode, receive, from the mode control circuit, the predetermined constant value in lieu of the amplitude,
• wherein the configurable receiver is configured to operate in the low power mode as a function of a determination that the radio frequency signal is a constant envelope modulated signal.

A system comprising:

• a configurable polar receiver configured to operate in at least a low power mode, comprising:
• a phase detection circuit configured to receive a radio frequency signal and to provide a value representing a phase of the radio frequency signal to a coordinate rotation digital computer (CORDIC) logic circuit;
• an amplitude detection circuit configured to receive the radio frequency signal and to generate an amplitude signal from the radio frequency signal;
• and
• a mode control circuit coupled to the amplitude detection circuit and to an input of the CORDIC logic circuit, the mode control circuit configured to receive an indication to selectively disable the amplitude detection circuit and to provide, when the configurable polar receiver is operating in the low power mode, a predetermined constant value to the CORDIC logic circuit in lieu of the amplitude signal from the amplitude detection circuit,
• wherein the configurable polar receiver is configured to operate in the low power mode as a function of a determination that the radio frequency signal is a constant envelope modulated signal.

A configurable receiver comprising:

• a frequency division circuit to receive a radio frequency signal and generate a frequency-divided output signal;
• a time-to-digital converter coupled to the frequency division circuit to identify a period of the frequency-divided output signal;
• a digital subtractor coupled to the time-to-digital converter to generate an offset digital time signal, the offset digital time signal operable to identify a shift in phase of the frequency-divided output signal by identifying a temporary change in the period of the frequency-divided output signal;
• a digital integrator coupled to the digital subtractor to provide a value representing a phase of the radio frequency signal;
• an amplitude detection circuit coupled to the frequency division circuit, the amplitude detection circuit coupled to receive the radio frequency signal and generate an amplitude signal representing an amplitude of the radio frequency signal;
• and
• a mode control circuit coupled to the amplitude detection circuit and to an input of a coordinate rotation digital computer (CORDIC) logic circuit, the mode control circuit configured, in a low power mode of operation, to receive an indication to disable the amplitude detection circuit and to provide a predetermined constant value to the CORDIC logic circuit in lieu of the amplitude signal from the amplitude detection circuit.