Patent ID: 9419660
Filing Date: 2016-08-16
CPC Classification: H04B

Claim Text:
1. A signal receiver, comprising: an antenna for receiving electromagnetic signals; at least one low noise amplifier for amplifying signals received by the antenna; at least one MEMS or crystal oscillator comprising a reference resonator to generate an oscillating signal with a predefined duty-cycle; a mixer for mixing the amplified and received signals with the oscillating signal to generate intermediate signals; a band-pass filter to filter the intermediate signals; and a duty-cycle controller coupled to the at least one MEMS or crystal oscillator and coupled to the output of the band-pass filter to analyze a spectrum of the filtered intermediate signals and to modify the duty-cycle of the oscillating signal in response to the spectrum analysis of the filtered intermediate signals, said duty-cycle being defined by a ratio of ON times and OFF times of the oscillating signal, in order to minimize an amplitude of at least one higher harmonic component from the at least one MEMS or crystal oscillator having the reference resonator in the filtered intermediate signals, wherein the duty-cycle controller comprises a measurement unit to measure the magnitude of a selected harmonic component of the filtered intermediate signals, and a control unit coupled to the measurement unit and being operable to generate a duty-cycle modification signal in response to the measured magnitude of the selected harmonic component, and wherein the signal receiver includes a duty-cycle modifier coupled to or integrated into the duty-cycle controller, wherein the duty-cycle modifier is operable to increase or to decrease the duty-cycle of the oscillating signal in response to the duty-cycle modification signal obtained from the control unit.