An electronic envelope detection circuit includes an input signal detecting circuit having at least one MOS transistor configured to receive a radiofrequency input signal and to deliver an internal signal on the basis of the input signal. The biasing point of the at least one transistor is controlled by the input signal and a control signal. A processing circuit that is coupled to the input signal detecting circuit is configured to deliver a low-frequency output signal on the basis of the internal signal and further deliver the control signal on the basis of the output signal. In operation, the value of the control signal decreases when the average power of the input signal increases, and vice versa.

A local oscillator outputs a local oscillation signal. A orthogonal detector subjects a received signal to orthogonal detection by using the local oscillation signal so as to output an I-phase baseband signal and a Q-phase baseband signal. A first HPF and a second HPF reduce a direct current component of each of the I-phase baseband signal and the Q-phase baseband signal. A demodulator demodulates the I-phase baseband signal and the Q-phase baseband signal output from the first HPF and the second HPF. A distribution detector detects an unevenness in a distribution of the I-phase baseband signal and the Q-phase baseband signal with the reduced direct current component. When the distribution detector detects an unevenness in the distribution, the distribution detector changes a status of the first HPF and the second HPF.

A carrier recovery system for a receiver of a phase-modulated signal N-PSK, the system including a first pre-conditioning circuit of the signal received (S(t)), with the pre-conditioned signal (SP(t)) having a component, non-modulated in phase, at the frequency N.sub.c where .sub.c is the carrier used for the modulation N-PSK, and a carrier regeneration circuit to regenerate two sinusoidal signals in quadrature at the frequency .sub.c, with these signals being phase locked with respect to said non-modulated component in phase of the pre-conditioned signal.

An electronic device may be provided with an antenna, a receiver, and baseband circuitry coupled to the receiver over a digital interface. The receiver may receive radio-frequency signals using the antenna and may generate digital in-phase and quadrature-phase (I/Q) samples from the radio-frequency signals. The I/Q samples may have a bit width and may be transmitted to the baseband circuitry over the digital interface. The baseband circuitry may evaluate a radio condition of the receiver based on the I/Q samples. The baseband circuitry may adjust the bit width of the I/Q samples based on the radio condition. For example, the baseband circuitry may decrease the bit width when wireless performance metric data falls below a threshold and/or may increase the bit width when the wireless performance metric data exceeds a threshold. This may minimize power consumed by the digital interface without sacrificing wireless performance.

A local oscillator outputs a local oscillation signal. A orthogonal detector subjects a received signal to orthogonal detection by using the local oscillation signal so as to output an I-phase baseband signal and a Q-phase baseband signal. A first HPF and a second HPF reduce a direct current component of each of the I-phase baseband signal and the Q-phase baseband signal. A demodulator demodulates the I-phase baseband signal and the Q-phase baseband signal output from the first HPF and the second HPF. A distribution detector detects an unevenness in a distribution of the I-phase baseband signal and the Q-phase baseband signal with the reduced direct current component. When the distribution detector detects an unevenness in the distribution, the distribution detector changes a status of the first HPF and the second HPF.

A FMCW radar receiver includes a LO providing a chirped LO signal, an in-phase (I) channel for outputting I-data and a quadrature (Q) channel for outputting Q-data. A dynamic correction parameter generator generates IQ phase correction values (P[n]s) and IQ gain correction values (G[n]s) based on a frequency slope rate of the chirped LO signal for generating during intervals of chirps including a first sequence of P[n]s and G[n]s during a first chirp and a second sequence of P[n]s and G[n]s during a second chirp. An IQ mismatch (IQMM) correction circuit has a first IQMM input coupled to receive the I-data and a second IQMM input receiving the Q-data, and the P[n]s and G[n]s. During the first chirp the IQMM correction circuit provides first Q-data and first I-data and during the second chirp the IQMM correction circuit provides at least second Q-data and second I-data.

A demodulator including a peak sampler to control an ADC or a digital resampler to sample a carrier signal in an unmodulated state at peaks, and to sample the carrier signal in a modulated state at a phase of the unmodulated state; and an envelope builder to determine an envelope signal based on differentials between maximum and minimum peaks of respective cycles of the sampled carrier signal. Further, a demodulator having an offset estimator to estimate in-phase and quadrature components of a carrier signal in an unmodulated state to determine in-phase and quadrature component offsets; a load modulated signal estimator to estimate in-phase and quadrature components of a load modulated signal by removing the in-phase and quadrature component offsets from in-phase and quadrature component samples of the carrier signal; and an envelope builder to build an envelope signal by combining the in-phase and quadrature components of the load modulated signal.

A FMCW radar receiver includes a LO providing a chirped LO signal, an in-phase (I) channel for outputting I-data and a quadrature (Q) channel for outputting Q-data. A dynamic correction parameter generator generates IQ phase correction values (P[n]s) and IQ gain correction values (G[n]s) based on a frequency slope rate of the chirped LO signal for generating during intervals of chirps including a first sequence of P[n]s and G[n]s during a first chirp and a second sequence of P[n]s and G[n]s during a second chirp. An IQ mismatch (IQMM) correction circuit has a first IQMM input coupled to receive the I-data and a second IQMM input receiving the Q-data, and the P[n]s and G[n]s. During the first chirp the IQMM correction circuit provides first Q-data and first I-data and during the second chirp the IQMM correction circuit provides at least second Q-data and second I-data.

An electronic device may be provided with an antenna, a receiver, and baseband circuitry coupled to the receiver over a digital interface. The receiver may receive radio-frequency signals using the antenna and may generate digital in-phase and quadrature-phase (I/Q) samples from the radio-frequency signals. The I/Q samples may have a bit width and may be transmitted to the baseband circuitry over the digital interface. The baseband circuitry may evaluate a radio condition of the receiver based on the I/Q samples. The baseband circuitry may adjust the bit width of the I/Q samples based on the radio condition. For example, the baseband circuitry may decrease the bit width when wireless performance metric data falls below a threshold and/or may increase the bit width when the wireless performance metric data exceeds a threshold. This may minimize power consumed by the digital interface without sacrificing wireless performance.