Abstract: A receiver of a GNSS system is provided. The receiver comprises two mixers and a processing circuit. The first mixer down-converts an input radio-frequency signal comprising a first GNSS signal and a second GNSS signal into a first low-frequency signal. The second mixer down-converts the input radio-frequency signal into a second low-frequency signal. The processing circuit generates at least one phase-shifted low-frequency signal according to at least the first low-frequency signal, extract signal components of the first GNSS signal by rejecting signal components of the second GNSS signal according to the second low-frequency signal and the at least one phase-shifted low-frequency signal, and extract signal components of the second GNSS signal by rejecting signal components of the first GNSS signal according to the second low-frequency signal and the at least one phase-shifted low-frequency signal. The first and second GNSS signals are situated in different frequency ranges.

Abstract: A receiver of a GNSS system is provided. The receiver comprises two mixers and a processing circuit. The first mixer down-converts an input radio-frequency signal comprising a first GNSS signal and a second GNSS signal into a first low-frequency signal. The second mixer down-converts the input radio-frequency signal into a second low-frequency signal. The processing circuit generates at least one phase-shifted low-frequency signal according to at least the first low-frequency signal, extract signal components of the first GNSS signal by rejecting signal components of the second GNSS signal according to the second low-frequency signal and the at least one phase-shifted low-frequency signal, and extract signal components of the second GNSS signal by rejecting signal components of the first GNSS signal according to the second low-frequency signal and the at least one phase-shifted low-frequency signal. The first and second GNSS signals are situated in different frequency ranges.

Abstract: An exemplary amplitude shift keying (ASM) demodulator and a radio frequency identification (RFID) system using the same are provided. The ASM demodulator is adapted to demodulate an alternating current input signal and generate a demodulated envelope signal. The ASM demodulator includes a signal input terminal group, an input rectifier circuit, a current mirror circuit electrically coupled to the input rectifier circuit, an output stage electrically coupled to the current mirror circuit, and a low pass filter electrically coupled to the output stage. The input rectifier circuit is electrically coupled to the signal input terminal group and adapted to perform a rectifying operation applied to the alternating current input signal. The input rectifier circuit includes a plurality of electrically coupled transistors and a gate electrode of each of the transistors is unconnected with a source electrode and a drain electrode itself.

Abstract: An exemplary amplitude shift keying (ASM) demodulator and a radio frequency identification (RFID) system using the same are provided. The ASM demodulator is adapted to demodulate an alternating current input signal and generate a demodulated envelope signal. The ASM demodulator includes a signal input terminal group, an input rectifier circuit, a current mirror circuit electrically coupled to the input rectifier circuit, an output stage electrically coupled to the current mirror circuit, and a low pass filter electrically coupled to the output stage. The input rectifier circuit is electrically coupled to the signal input terminal group and adapted to perform a rectifying operation applied to the alternating current input signal. The input rectifier circuit includes a plurality of electrically coupled transistors and a gate electrode of each of the transistors is unconnected with a source electrode and a drain electrode itself.