I/Q quadraphase modulator circuit

Details I/Q quadraphase modulator circuit I/Q quadraphase modulator circuit

1994-01-25

1996-11-12

Coles, Sr., Edward L.

Pulse or digital communications

Transmitters

375261, 375298, 332103, H04L 2704, H03C 300

Patent

active

055747558

ABSTRACT:
An I/Q quadraphase modulator circuit for correcting phase errors of, typically, LO input quadrature signals. The circuit uses a pair of Gilbert cell multipliers, to the bottom ports of which are applied I and Q signals, and to the top ports of which are applied sum and difference, limited, quadrature, differential signals. The result is to make the circuit less sensitive to LO phase errors and thus to improve sideband (image) rejection over the conventional circuit typically using one Gilbert cell multiplier.

REFERENCES:
patent: 4766400 (1988-08-01), Fox
patent: 4908840 (1990-03-01), Kakimoto
patent: 5012208 (1991-04-01), M akinen et al.
patent: 5231364 (1993-07-01), Mucke
patent: 5319675 (1994-06-01), Osaka
patent: 5355101 (1994-10-01), Ichihara et al.
patent: 5387883 (1995-02-01), Ueda
patent: 5406587 (1995-04-01), Horwitz et al.
patent: 5412351 (1995-05-01), Nystrom et al.
"Silicon Bipolar Monolithic QPSK Modulator", Technical Data, Hewlett Packard.

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