Voltage controlled ring oscillator stabilized against supply vol

Details Voltage controlled ring oscillator stabilized against supply vol Voltage controlled ring oscillator stabilized against supply vol

1996-12-20

1998-06-09

Grimm, Siegfried H.

Oscillators

Ring oscillators

331177R, 331183, H03B 504

Patent

active

057641102

ABSTRACT:
A circuit for suppressing period jitter of the clock output of a ring oscillator caused by supply voltage fluctuations. The ring oscillator includes n identical current controlled delay circuits 26.1-n connected in a ring, and a replica circuit 36 identical to the current controlled delay circuit. The replica circuit 36 receives a constant input voltage so that its output is always at a high level. A differential amplifier 35 receiving a reference potential Vref is connected in a negative feedback circuit with replica circuit 36, so that the output of the replica circuit 36 is held equal to the reference potential Vref. An output of the negative feedback circuit is also applied to each of the current controlled delay circuits 26.1-n, so that their high level outputs are held equal to the reference potential Vref.

REFERENCES:
patent: 5075640 (1991-12-01), Miyazawa
patent: 5410278 (1995-04-01), Itoh et al.
IEEE, Journal of Solid-State Circuits, vol. 27, No. 11, pp. 1599-1606, Nov. 1992, Ian A. Young, et al., "A PLL Clock Generator with 5 to 110 MHz of Lock Range for Microprocessors".

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