Homodyne down-converter with digital hilbert transform...

Details Homodyne down-converter with digital hilbert transform... Homodyne down-converter with digital hilbert transform...

H - Electricity

04

B

325/110

H04B 1/16 (2006.01) H03D 3/00 (2006.01) H03D 7/00 (2006.01)

Patent

CA 2007149

A homodyne down-converter, for use in an IF signal demodulator and the lake, includes an analog-to-digital converter (ADC) which receives the IF analog signal for conversion to a digital data stream by sampling at a sampling rate frequency substantially equal to four times the IF signal frequency. A digital mixer controllably inverts the sampled data to convert the data to baseband, before a circuit removes the effects of DC offset in the analog IF signal applied to the ADC. A discrete Hilbert Transform filter is used for generating streams of sequential in-phase I' and quadrature-phase Q' data words, which are resampled to temporally align the two data word streams at a new data rate, thus effectively removing sample offset without the need for separate misalignment correction circuitry.

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