Digital-controlled oscillator for eliminating frequency...

Details Digital-controlled oscillator for eliminating frequency... Digital-controlled oscillator for eliminating frequency...

2008-09-23

2010-06-01

Mis, David (Department: 2817)

Oscillators

With frequency adjusting means

Step-frequency change

C331S00100A, C331S008000, C331S017000, C331S034000, C331S03600C, C331S096000, C331S17700V, C331S1170FE

Reexamination Certificate

active

07728686

ABSTRACT:
A digital-controlled oscillator (DCO) is utilized in an all-digital phase-locked loop for eliminating frequency discontinuities. The DCO includes a tank module and a negative gm cell. The tank module comprises a plurality of cells, at least a portion of the cells comprising a first tracking set and a second tracking set for respectively handling an odd bit or an even bit. The odd bit and the even bit are related to an integer signal, a fractional signal or a combination thereof, the fractional signal is indicated by a primary voltage inputted to the DCO. With the DCO, frequency discontinuities and undesired spurs are eliminated.

REFERENCES:
patent: 7495516 (2009-02-01), Travis
Robert Bogdan Staszewski et al., IEEE Journal of Solid-State Circuits, vol. 39, No. 12, Dec. 2004, p. 2278-2291.
Robert Bogdan Staszewski et al., IEEE Journal of Solid-State Circuits, vol. 40, No. 12, Dec. 2005, p. 2469-2482.

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