FSK/GFSK demodulator with digital frequency offset compensation and the demodulating method of the same

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United States of America Patent

APP PUB NO 20030002600A1
SERIAL NO

10174877

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Abstract

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The present invention discloses an FSK/GFSK demodulator with digital frequency offset compensation, comprising: an FSK/GFSK signal demodulator, for receiving a transmission signal from an antenna and generating an inter-medium frequency (base-frequency) signal after amplification and filtering; an analog-to-digital converter (ADC), for receiving the inter-medium frequency (base-frequency) signal from the FSK/GFSK signal demodulator and converting the signal into a digital signal; a digital frequency discriminator, for receiving the digital signal from the analog-to-digital converter and generating a discriminated signal; a digital band-pass filter, for filtering off a high-frequency component and a DC component of the discriminated signal and generating a demodulated signal; and a data slicer, for receiving the demodulated signal and generating a received signal. The digital band-pass filter is composed of a digital low-pass filter and a digital high-pass filter connected in series. The FSK/GFSK demodulator with digital compensation for frequency offset according to the present invention employs a digital filter unit to filter off the direct-current (DC) component of the frequency offset of the discriminated signal, and generates a demodulated signal independent of the DC component of the frequency offset. Therefore, the data slicer can correctly determine the demodulated signal without the DC level.

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Patent Owner(s)

Patent OwnerAddress
REALTEK SEMICONDUCTOR CORP2 INNOVATION RD II SCIENCE PARK HSINCHU

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ku, Shih-Yu Hsinchu, TW 5 12
Twu, Dsun-Chie Hsinchu, TW 4 17

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