Ring oscillator having two rings whose outputs are combined

Details Ring oscillator having two rings whose outputs are combined Ring oscillator having two rings whose outputs are combined

1996-03-13

1997-09-16

Grimm, Siegfried H.

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

331 2, 331 34, 331 56, 331 57, 331177R, 331179, 455 76, H03B 502

Patent

active

056685050

ABSTRACT:
An oscillator is provided having a plurality of cascade coupled inverters Each one of the inverters is a differential amplifier having a p-input and an n-input. The output of each one of the amplifiers is connected to: the n-input of the next succeeding amplifier to provide a closed loop, or ring oscillator; and, the p-input of an amplifier positioned an even number of amplifier stages forward of such next succeeding amplifier. In a preferred embodiment, each amplifier in the ring includes an n channel transistor (nMOS transistor) connected in a totem pole arrangement, to a p channel transistor (pMOS transistor). The gate of the nMOS transistor provides the n-input and gate of the pMOS transistor provides the p-input. The source and drain paths of the pMOS and nMOS transistors are connected together to provide an output for the amplifier. With such arrangement, because the gate of the more slowly responding pMOS transistor is driven before the gate of the nMOS transistor the oscillator is adapted to operate at a higher frequency of oscillation.

REFERENCES:
IEEE Journal of Solid-State Circuits, vol. 25, No. 1, Feb. 1990 "A 300-MHZ CMOS Voltage-Controlled Ring Oscillator", Enam et al, pp. 312-315.

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