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US 10,541,688 B2Granted
Ring oscillator circuit with frequency stabilization
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorsKenneth R. Knowles, Daniel Pirkl
Life of this patent
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Abstract
A ring oscillator circuit is disclosed. The ring oscillator in one embodiment includes an odd number of inverters connected in a loop fashion, a current mirror having a drain of a first transistor connected to the inverters, and a self-biased inverter connected to a drain of a second transistor of the current mirror.
Claims15
A ring oscillator comprising:
- a plurality of inverters connected in a loop fashion;
- a current mirror having a drain of a first transistor connected to said plurality of inverters;
- and
- a self-biased inverter connected to a drain of a second transistor of said current mirror;
- wherein an output of said self-biased inverter is connected to an input of said self-biased inverter;
- and
- wherein a supply current of said self-biased inverter is subtracted from said drain of said first transistor of said current mirror to regulate a frequency of said ring oscillator.
4 more elements
A temperature compensating system for a ring oscillator, comprising:
- a plurality of inverters connected in a loop fashion and forming the ring oscillator;
- a current mirror having a first transistor and a second transistor, wherein a drain of the first transistor is connected to the plurality of inverters for controlling the ring oscillator;
- and
- a self-biased inverter connected to a drain of the second transistor of the current mirror, wherein the self-biased inverter draws a compensation current as a circuit temperature increases, and wherein the compensation current of the self-biased inverter is subtracted from the drain of the first transistor of the current mirror to regulate a frequency of the ring oscillator as the circuit temperature increases;
- wherein an output of the self-biased inverter is connected to an input of said self-biased inverter.
2 more elements
Dependencies are inferred from the claim text.