Cross coupled voltage controlled oscillator

Details Cross coupled voltage controlled oscillator Cross coupled voltage controlled oscillator

2006-07-04

2006-07-04

Pascal, Robert (Department: 2817)

Oscillators

Ring oscillators

C331S045000, C331S046000

Reexamination Certificate

active

07071789

ABSTRACT:
An oscillator circuit comprises a plurality of ring oscillators wherein each ring oscillator produces an oscillatory output signal. The ring oscillators are cross-coupled such that each ring oscillator drives only one other ring oscillator. In at least one embodiment, the oscillator circuit comprises four, three-stage ring oscillators. As such, each ring oscillator comprising three cells (e.g., inverters or delay elements). Further, in this embodiment, the oscillator circuit produces a four phase clock comprising the oscillatory output signals from each of the four ring oscillators.

REFERENCES:
patent: 5635877 (1997-06-01), Monk et al.
patent: 5677650 (1997-10-01), Kwasniewski et al.
patent: 6426662 (2002-07-01), Arcus
patent: 6617936 (2003-09-01), Dally et al.
patent: 6870431 (2005-03-01), Afghahi
Retdian, Nicodimus; Takagi, Shigetaka; and Fujii, Nobuo, Voltage Controlled Ring Oscillator with Wide Tuning Range and Fast Voltage Swing, 4 pgs., Tokyo, Japan.

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