Oscillators – Ring oscillators
Patent
1999-05-25
2000-12-19
Grimm, Siegfried H.
Oscillators
Ring oscillators
331177R, H03B 502
Patent
active
061632260
ABSTRACT:
A current-controlled oscillator (ICO) circuit including an all p-channel transistor based ring oscillator, a first current mirroring stage, and a second current mirroring stage. The all p-channel transistor based ring oscillator, p-channel transistors in the input structure of each amplification stage, and metal lines in the ring and from the ring to the amplification stages over an n-well improve noise immunity and tolerance. The first current mirroring stage utilizes an input current to generate a first voltage controlling a series of differential delay cells connected in a ring topology that forms the ring oscillator. The second mirroring stage utilizes a precision current to generate a second voltage controlling at least one amplification stage, which converts corresponding delay cell output signals to a single-ended logic level signal compatible with external circuitry needs. Each amplification stages utilizes the second control voltage to create a similar or ratioed copy of the precision current flowing in each amplification stage. A second embodiment of the ICO is also included, which operates at a lower frequency, thus higher bandwidth, than that of the first embodiment.
REFERENCES:
patent: 5847616 (1998-12-01), Ng et al.
Brown Michael Arthur
Jelinek Jules Joseph
Shirani Ramin
Grimm Siegfried H.
King Patrick T.
Lucent Technologies - Inc.
LandOfFree
Current-controlled p-channel transistor-based ring oscillator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Current-controlled p-channel transistor-based ring oscillator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current-controlled p-channel transistor-based ring oscillator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-274246