Ring oscillator circuit for VCO

Details Ring oscillator circuit for VCO Ring oscillator circuit for VCO

1994-08-15

1995-10-10

Grimm, Siegfried H.

Oscillators

Ring oscillators

331108A, 331177R, H03K 303, H03K 3354

Patent

active

054574293

ABSTRACT:
In a ring oscillator type VCO in which plural stages of inverter circuits are cascade-connected to each other so as to constitute a positive feedback loop, delay amounts for both a rising edge and a falling edge of an output signal from the inverter circuit are controlled to have the same delay amount by way of a control signal. These delay amounts of the rising edge and the falling edge are controllable in such a manner that the duty ratio of an oscillator output signal is not varied. Each stage of the inverter circuit is arranged by three-stage inverters made of load transistors and driver transistors, and the control voltage is applied to the load transistors of the two adjoining inverters among the three-stage inverters.

REFERENCES:
patent: 5038118 (1991-08-01), Langenkamp
patent: 5081428 (1992-01-01), Atriss et al.

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