Pulse or digital communications – Transmitters
Patent
1999-07-09
2000-10-31
Chin, Stephen
Pulse or digital communications
Transmitters
375296, 375298, H04L 2704
Patent
active
061413895
ABSTRACT:
A digital communications modulator (10) includes a low speed IC (12) which performs encoding, symbol generation, pulse shaping, interpolation, linearization, and small amounts of frequency tuning. A complex, baseband digital communications signal (34) is output from the low speed IC (12) as a plurality of parallel streams of digital words. In a digital tuner 14 which includes a high speed IC (20), these parallel streams are digitally combined and digitally up-converted to an IF digital data stream (68) that may have a center frequency many times the baud rate. The high speed IC (20) also converts the digital stream to a broadband analog signal (40). The broadband analog signal (40) is processed through an analog band pass filter (42) that removes spectral images, reduces quantization errors, and limits the bandwidth approximately to the baud rate.
REFERENCES:
patent: 4626803 (1986-12-01), Holm
patent: 5351016 (1994-09-01), Dent
patent: 5412352 (1995-05-01), Graham
patent: 5512865 (1996-04-01), Fague
patent: 5534828 (1996-07-01), Okada et al.
patent: 5757858 (1998-05-01), Black et al.
patent: 5781076 (1998-07-01), Iwamatsu et al.
patent: 5783974 (1998-07-01), Koslov et al.
IBM Microelectroinics "SiGe DAC Functional Description"May 5, 1998.
Badke Bradley Paul
McCallister Ronald D.
Chin Stephen
Gresham Lowell W.
Ha Dac V.
Meschkow Jordan M.
SiCOM, Inc.
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