I.sup.2 L ring oscillator and method of fabrication

Details I.sup.2 L ring oscillator and method of fabrication I.sup.2 L ring oscillator and method of fabrication

1976-11-22

1978-03-14

Grimm, Siegfried H.

Oscillators

Ring oscillators

73359A, 307303, 331108B, 331108C, 331177R, H03B 502

Patent

active

040793389

ABSTRACT:
A novel I.sup.2 L ring oscillator circuit includes means by which the repetition rate is adjustable. A plurality of cascaded logic gate stages are coupled in a ring configuration to achieve a plurality of astable states. Frequency adjustments are made by varying the amount of injection current applied to the logic gates which comprise the ring oscillator. Lowering injection current increases delay time from one astable state to the next resulting in a lower frequency repetition rate. The ring oscillator may be fabricated on a single substrate along with other I.sup.2 L circuitry and be utilized as the clock source therefore. In one embodiment of the circuit, a plurality of discrete frequency adjustments are provided; by selection of a particular lead pattern during fabrication of the oscillator, the appropriate injection current to the oscillator logic gates is provided.

REFERENCES:
patent: 3395362 (1968-07-01), Sutherland
patent: 3428913 (1969-02-01), Pechoucek

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