Integrated semiconductor circuit with a ring oscillator

Details Integrated semiconductor circuit with a ring oscillator Integrated semiconductor circuit with a ring oscillator

1985-01-17

1986-11-25

Wan, Gene

Oscillators

Ring oscillators

331177R, H03B 502

Patent

active

046251812

ABSTRACT:
An integrated semiconductor circuit with a ring oscillator having a frequency settable via an operating current of the ring oscillator, the ring oscillator having inverter cells which are connected in parallel with respect to the current supply of the ring oscillator, conjointly with a current supply terminal thereof, via a variable resistance to the supply potential present in the current supply, includes a voltage divider forming the variable resistance and including a plurality of series-connected resistors, the voltage divider having a plurality of terminals including an end terminal, the end terminal connecting the voltage divider in an identical manner to a current supply terminal of the inverter cells of the ring oscillator and, additionally, to an externally addressable electrode, each even-numbered other terminal of the voltage divider, as counted in direction of increasing distance from the end terminal, being likewise connected to another externally addressable electrode, respectively, of the integrated circuit and additionally connected via a respective diode to both terminals, respectively, adjacent thereto, the connecting diodes having respective anodes connected to respective uneven-numbered terminals, and having respective cathodes connected to a respective one of the two even-numbered terminals adjacent thereto.

REFERENCES:
patent: 4079338 (1978-03-01), Kronlage

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