Quadrature signal generator and method therefor

Details Quadrature signal generator and method therefor Quadrature signal generator and method therefor

1999-06-01

2000-12-05

Nuton, My-Trang

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

H03H 1116, H03K 300

Patent

active

061572357

ABSTRACT:
A quadrature generator (100) includes a phase detector (125) having a set of differential inputs for coupling in-phase and quadrature signals (114,116) and a set of differential outputs for providing a phase error signal (135). Switches (122,127) are associated with the set of input terminals and with the set of output terminals. The switches (122,127) are synchronously controlled to switch around the signals at the input terminals and at the output terminals in concert, and in rapid succession. The operation of the switches (122,127) eliminates or reduces the effects of imperfections within the parallel paths of the phase detector circuitry (125), in order to produce a more accurate phase deviation signal.

REFERENCES:
patent: 3757214 (1973-09-01), Kaufman
patent: 4682117 (1987-07-01), Gibson
patent: 4696017 (1987-09-01), Masheff et al.
patent: 4908532 (1990-03-01), Chadwick
patent: 5109392 (1992-04-01), McDonald
patent: 5847619 (1998-12-01), Kirisawa

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