Digital quadrature phase detector for angle modulated signals

Details Digital quadrature phase detector for angle modulated signals Digital quadrature phase detector for angle modulated signals

1991-11-25

1992-10-20

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Input signal split into plural signals

329302, 329306, 329323, 329341, 329346, 375 80, H03D 300

Patent

active

051573440

ABSTRACT:
An analog angle modulated signal is converted into a digital signal within an A/D converter using a sampling clock having a frequency an integer times higher than the carrier of the angle modulated signal. The digital signal is delayed by one sampling slot within each of four delay circuits connected in series to the A/D converter. The output of the A/D converter and that of the fourth delay circuit are multiplied by -1/2 within respective digital weighting circuits, and the multiplied outputs as well as the output of the second delay circuit are added together to generate an I component level signal. The output of the first delay circuit is multiplied by -1 within another weighting circuit and this multiplied output as well as the output of the third delay circuit are added together to generate a Q component level signal.

REFERENCES:
patent: 4528511 (1985-07-01), Smith
patent: 4547737 (1985-10-01), Gibson
patent: 4567442 (1986-01-01), Haussmann

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