Current control circuit of ring oscillator

Details Current control circuit of ring oscillator Current control circuit of ring oscillator

1995-07-11

1996-10-22

Mis, David

Oscillators

With particular source of power or bias voltage

331 34, 331 57, 331177R, H03B 524, H03B 500, H03L 700, H03L 7085

Patent

active

055681034

ABSTRACT:
A current control circuit of a ring oscillator is provided for use in the PLL oscillators. A current control circuit used in the ring oscillator comprises a first circuit having a first current source and a first transistor connected in series; a second circuit connected with the first circuit in parallel and having n second constant current sources and n second transistors connected in series, respectively, the second transistors are current mirrored with the first transistor in the first circuit, respectively; a third circuit connected with the first circuit in parallel and having a third transistor and a fourth transistor connected in series, the fourth transistor is current mirrored with the first transistor; n diodes connected to a connecting point of said third transistor and the fourth transistor for supplying currents to connecting points of n second constant current sources and the second transistor, respectively; an input terminal connected with the connecting point of the first constant current source and the first transistor.

REFERENCES:
patent: 5331295 (1994-07-01), Jelinek et al.
patent: 5410278 (1995-04-01), Itoh et al.

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