Demodulators – Frequency modulation demodulator – Input signal split into plural signals
Patent
1998-06-29
2000-10-24
Grimm, Siegfried H.
Demodulators
Frequency modulation demodulator
Input signal split into plural signals
329341, 455214, 327255, 327290, 327557, H03D 306, H03H 1118
Patent
active
061373532
ABSTRACT:
An approach for demodulating a frequency-modulated signal involves processing a frequency-modulated signal with a phase shifter network to provide a demodulated signal that has a relatively constant amplitude around the center frequency of the frequency-modulated signal and that exhibits a relatively linear phase change over an operational frequency range. Embodiments of the invention include a phase shifter network, using N number of cascaded all-pass filters, that receives as an input a limited amplitude signal and outputs a phase-shifted limited amplitude signal that is mixed with the limited amplitude signal. The phase shifter network may also comprise a low-pass bessel filter.
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Mohindra Rishi
Stroet Peter
Grimm Siegfried H.
Philips Electronics North America Corporation
Wieghaus Brian J.
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