Pulse or digital communications – Receivers – Automatic frequency control
Patent
1995-03-06
1999-01-05
Le, Amanda
Pulse or digital communications
Receivers
Automatic frequency control
4551891, 4551901, 4551922, 455207, 455209, 455255, 455316, 455323, 348731, 348735, H04L 2706
Patent
active
058570047
ABSTRACT:
A digital data receiver comprising a first frequency converter for converting a high frequency digital orthogonal modulation signal into a first intermediate frequency signal based on a first local oscillation signal, a second frequency converter for converting the first intermediate frequency signal into a second intermediate frequency signal based on a second local oscillation signal, and a demodulator for performing a orthogonal demodulation to the second intermediate frequency signal based on a third local oscillation signal, wherein the first local oscillation signal is generated by a variable oscillator for a PLL frequency synthesizer, the second local oscillation signal is generated by a high frequency oscillator in which its oscillation frequency is controlled based on the frequency control signal generated by the modulator to perform the orthogonal demodulation processing, and the third local oscillation signal is generated by a fixed oscillator in which its oscillation frequency is fixed.
REFERENCES:
patent: 3311832 (1967-03-01), Schrader
patent: 3544899 (1970-12-01), Gusyatinsky et al.
patent: 4580289 (1986-04-01), Enderby
patent: 5034695 (1991-07-01), Owen
patent: 5111162 (1992-05-01), Hietala et al.
patent: 5260671 (1993-11-01), Iso et al.
patent: 5280644 (1994-01-01), Vannatta et al.
patent: 5548344 (1996-08-01), Park
patent: 5570136 (1996-10-01), Kim
Kabushiki Kaisha Toshiba
Le Amanda
LandOfFree
Digital data receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital data receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital data receiver will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-867649