Synthetic quadrature generating apparatus

Details Synthetic quadrature generating apparatus Synthetic quadrature generating apparatus

1985-09-13

1988-11-22

Fleming, Michael R.

Boots, shoes, and leggings

36472401, 364825, G06F 1551

Patent

active

047870583

ABSTRACT:
A synthetic quadrature generating apparatus responsive to an input reference signal of the form SIN(wt) from an input reference signal source and to an error shifted quadrature signal of the form COS(wt+L) for forming a quadrature output signal of the form COS(wt)*COS(L) substantially free of error shift. The apparatus comprises an error signal synthesizing filter means responsive to the input reference signal and to the error shifted quadrature signal for forming a filtered signal of the form SIN(L); a correction means responsive to the input reference signal and to the filtered signal for forming their product as a filtered product signal; and a means responsive to the filtered product signal and the error shifted quadrature signal for forming their sum as an output quadrature signal of the form COS(wt)*COS(L).

REFERENCES:
patent: 3553447 (1971-01-01), Zimmerman
patent: 4100376 (1978-07-01), Woythaler
patent: 4206425 (1980-06-01), Nossen
patent: 4464638 (1984-08-01), Crowley
patent: 4589083 (1986-05-01), Le Dinh

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