Ring oscillator having selectable number of inverter stages

Details Ring oscillator having selectable number of inverter stages Ring oscillator having selectable number of inverter stages

1994-07-12

1995-05-23

Grimm, Siegfried H.

Oscillators

Ring oscillators

331177R, 331179, H03K 3354

Patent

active

054184991

ABSTRACT:
A ring oscillator wherein an inverter group includes five inverters (G1 to G5) connected in series, the output of the inverter (G3) is connected to the input of the first inverter (G1) through a transfer gate (TF1), and the output of the inverter (G5) is connected to the input of the inverter (G1) through a transfer gate (TF2). The ring oscillator is adapted such that, when a switching signal (S3) is "L", the CMOS transfer gates (TF1) and (TF2) are on and off, respectively, and the three inverters (G1 to G3) are connected in a loop whereas the inverters (G4, G5) function as buffers receiving the output of the inverter (G3), to provide an oscillation signal (S2) produced by the three inverters (G1 to G3) forming the loop from an output terminal (2) and such that, when the switching signal (S3) is "H", the oscillation signal (S2) produced by the five inverters (G1 to G5) forming the loop is provided, whereby the oscillation signal has a wide range of variable oscillation frequency bands.

REFERENCES:
patent: 4517532 (1985-05-01), Neidorff
patent: 4978927 (1990-12-01), Hausman et al.
patent: 5331294 (1994-07-01), Watanabe et al.

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