Digitally controlled oscillator with the wide operation range

Details Digitally controlled oscillator with the wide operation range Digitally controlled oscillator with the wide operation range

2011-04-26

2011-04-26

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

Reexamination Certificate

active

07932766

ABSTRACT:
There is provided a digitally controlled oscillator, which is capable of widening its operation range with maintaining its resolution and the maximum frequency at which it operates. The digitally controlled oscillator includes a phase compensation block, a coarse block, and a fine block. The phase compensation block510generating a PLL signal PLLCLK and a first clock signal CLK1which has the same phase and frequency as the PLL signal, in response to a phase control signal DISABLE and a fourth clock signal CLK4. The coarse block520generating a second clock signal CLK2and a third clock signal CLK3which results from delaying the PLL signal PLLCLK and the first clock signal CLK1for a given time, in response to a m(integer)-bit coarse A control signal COAR_A and an (m−1)-bit coarse B control signal COAR_B. The fine block generating the fourth clock signal CLK4by applying interpolation to the second clock signal CLK2and the third clock signal CLK3in response to an n(integer)-bit first fine control signal FCB and a n-bit second fine control signal FC.

REFERENCES:
patent: 5552726 (1996-09-01), Wichman et al.
patent: 5712582 (1998-01-01), Yokota et al.
patent: 7119596 (2006-10-01), Kong et al.
patent: 7839179 (2010-11-01), Lee
patent: 2008/0088349 (2008-04-01), Lee

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