Digital controlled oscillation circuit and PLL circuit

Details Digital controlled oscillation circuit and PLL circuit Digital controlled oscillation circuit and PLL circuit

1998-09-02

2000-07-25

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

327107, 327259, 331 57, H03K 513

Patent

active

060940816

ABSTRACT:
A digital controlled oscillation circuit which has a wide oscillation frequency range and continuous and smooth transition of the oscillation frequency and can prevent occurrence of jitter: in which provision is made of a first delay circuit for delaying a first signal by a control signal and outputting the same as a first delay signal; a second delay circuit for delaying a second signal by the control signal and outputting the same as a second delay signal; an RS FF which switches a first output signal from low to high and switches a second output signal from high to low and outputs the same when receiving as its input the first delay signal, while switches the first output signal from high to low and switches the second output signal from low to high and outputs the same when receiving as its input the second delay circuit; and first and second switching detection circuits for generating first and second delay circuits when detecting that the first and second output signals switch from high to low.

REFERENCES:
patent: 5155379 (1992-10-01), Narahara
patent: 5357204 (1994-10-01), Knoll
patent: 5920216 (1999-07-01), Fischer

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