Digital 2B1Q transmitter with high precision and linearity time

Details Digital 2B1Q transmitter with high precision and linearity time Digital 2B1Q transmitter with high precision and linearity time

1988-06-03

1990-01-23

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 23, 332112, H04L 2718

Patent

active

048963356

ABSTRACT:
A digital 2B1Q transmitter utilizes a dual modulator to generate a 2B1Q coded output by summing two binary modulated vectors in a 2:1 weighting ratio, allowing one modulating envelope generator to drive the dual modulator. The modulating envelope is coded in a 1-bit pulse density modulation (PDM) format, permitting the use of simple gating functions in performing the modulation function. The rising half of the transmit pulse is stored in the envelope generator, while the trailing half is derived from the rising half using the "1-x" function; this allows part of the summing functions to be reduced to OR gates.

REFERENCES:
patent: 3649915 (1972-03-01), Mildonian, Jr.
patent: 3956626 (1976-05-01), Ross
patent: 4087642 (1978-05-01), Jessop et al.
patent: 4355397 (1982-10-01), Stuart
patent: 4433310 (1984-02-01), Bic et al.

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