Patent ID: 6282255
Filing Date: 2001-08-28
Classification: H03K

Abstract:
Variable-modulo frequency divider of the type comprising a first chain of n greater than 3 D type flip-flops (1, 3, 5, 7, 9) linked in cascade, the output Q of one being linked to the input D of the next, and in which the complementary output Q of the last flip-flop (9) is fed back to the D input of the first flip-flop (1) by way of an ""OR"" circuit, characterized in that it comprises a second chain of D type flip-flops (2, 4, 6, 8) comprising a determined number of flip-flops associated respectively with a flip-flop of the first chain (1, 3, 5, 7) the flip-flops of each pair thus formed (1, 2; 3, 4; 5, 6; 7, 8) having the D inputs linked together, in which the complementary outputs Q of the flip-flops of the second chain (2, 4, 6, 8) as well as the output Q of the last flip-flop of the first chain are linked by the ""OR"" circuit to the D input of the first flip-flop of the first chain and in which control links (d.sub.1, d.sub.2 . . . d.sub.5) are provided linking the control inputs S for disabling the D flip-flops (2, 4, 6, 8) of the second chain and of the last D flip-flop (9) of the first chain so as to programme the modulo of the divider.