Multi-phase oscillator

Details Multi-phase oscillator Multi-phase oscillator

2011-05-17

2011-05-17

Kinkead, Arnold (Department: 2817)

Oscillators

Polyphase output

C331S002000, C331S046000, C331S057000

Reexamination Certificate

active

07944316

ABSTRACT:
A multi-phase oscillator includes a plurality of ring oscillators (21) each having a plurality of output ports and each formed by connecting an odd number of inverters (20) in a ring, and a plurality of resistance elements (30) coupling the output ports between the plurality of ring oscillators (21) so that all of the plurality of ring oscillators (21) operate at an identical frequency while keeping a desired phase relationship. The number of the ring oscillators (21) is not limited to an odd number but may be an even number. The multi-phase oscillator changes the state of a succeeding node of a phase coupling to accord with the state of a preceding node of the phase coupling by using the resistance elements (30) as phase coupling devices. If resistors are used as the resistance elements (30), the phase output accuracy greatly improves and high frequency oscillation is possible.

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