Ring oscillators having inverting and delay elements

Details Ring oscillators having inverting and delay elements Ring oscillators having inverting and delay elements

1998-04-23

2000-02-22

Grimm, Siegfried H.

Oscillators

Ring oscillators

331135, H03B 524

Patent

active

060284900

ABSTRACT:
An oscillator circuit constituted by connecting in a ring an odd number of stages of inverting delay circuits comprising inverting elements, for example, inverters INV1, INV2, and INV3, and delay elements D1, D2, and D3 connected to the output terminals of the inverting elements. In each delay element, the capacitor is charged and discharged in accordance with the output signal level from the inverter, the voltage of the capacitor and the reference voltage are compared by a comparison circuit, and a signal in accordance with the result of comparison is input to the inverting delay circuit of the next stage, therefore the delay time can be controlled by controlling the charging current of the delay element and the oscillation frequency can be controlled in accordance with this. Accordingly, the control property thereof is good, the range of variation can be broadened, and a reduction of jitter can be realized.

REFERENCES:
patent: 4656369 (1987-04-01), Lou

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