Zero crossing-current ring oscillator for substrate charge pump

Details Zero crossing-current ring oscillator for substrate charge pump Zero crossing-current ring oscillator for substrate charge pump

1992-03-06

1993-01-26

Grimm, Siegfried H.

Oscillators

Ring oscillators

3072962, H03P 502, H03K 3354

Patent

active

051825295

ABSTRACT:
A ring oscillator for use with a charge pump includes an odd number of inverter stages each having a primary input, a secondary input, and an output. Both inputs are switched to the same logic state to invert the logic signal at the output of the inverter stage. No crossing-current flows within the inverter stage if the inputs have different logic states. The output of each inverter stage is coupled to the primary input of a following inverter stage in a serially-connected ring fashion. The output of a last inverter stage is coupled to the primary input of a first inverter stage and forms an oscillating signal output, which is coupled to the charge pump. The secondary input of each stage is coupled to the output of a preceding inverter stage. The preceding inverter precedes the current inverter by an odd integer greater or equal to three. The ring oscillator includes a transistor coupled to the output of each inverter stage for impressing a initial pattern of alternating logic levels to begin the oscillation.

REFERENCES:
patent: 3350659 (1967-10-01), Henn
patent: 4705966 (1987-11-01), Van Zanten

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