RECEIVER FOR FSK RADIO FREQUENCY SIGNALS WITH HIGH SENSITIVITY DEMODULATOR AND METHOD FOR ACTIVATING THE SAME FSK

摘要

#CMT# #/CMT# The receiver (1) has a mixer block (4) mixing radiofrequency signals (FSK) and oscillating signals (So) to produce intermediate signals (INT). A sampler (10) samples the intermediate signals to provide sampled signals. A processing circuit (11) and a selector (12) perform discrete Fourier transform on the sampled signals to determine difference between frequency of a signal amplitude peak above a preset threshold and frequency in the intermediate signals to correct frequency of the oscillating signals and to demodulate data of the sampled signals in a high sensitivity demodulation stage (13). #CMT# : #/CMT# An independent claim is also included for a method for actuating a low power and high sensitivity radiofrequency signal receiver. #CMT#USE : #/CMT# Low power and high sensitivity radiofrequency signal receiver for use in a short range control system or in a data transmission system. #CMT#ADVANTAGE : #/CMT# The receiver is easily configurable to center frequency of the intermediate signals before high sensitivity demodulation operation. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a simplified circuit diagram representing execution of a low power and high sensitivity radiofrequency signal receiver. '(Drawing includes non-English language text)' D-OUT : Data signals FSK : Radiofrequency signals INT : Intermediate signals So : Oscillating signals 1 : Low power and high sensitivity radiofrequency signal receiver 2 : Antenna 3 : Low noise amplifier 4 : Mixer block 5 : Quartz resonator local oscillator 8 : Wideband or polyphase filter 10 : Sampler 11 : Processing circuit 12 : Selector 13 : High sensitivity demodulation stage.