Integrated circuit process and bias monitors and related methods
First Claim
1. An integrated circuit device, comprising:
- at least one oscillator stage that includesa current mirror circuit comprising first and second mirror transistors of a first conductivity type, and configured to mirror current on two mirror paths,at least one reference transistor of a second conductivity type having a source-drain path coupled to a first of the mirror paths, anda switching circuit coupled to a second of the mirror paths and configured to generate a transition in a stage output signal in response to a stage input signal received from another oscillator stage, whereinthe channel lengths of the first and second mirror transistors are larger than that of the at least one reference transistor;
whereinthe at least one oscillator stage includes a plurality of oscillator stages connected as ring oscillator circuit, with stage output signals of each oscillator stage being coupled to an input of another oscillator stage; and
body bias circuits configured to generate at least one body bias voltage in response to the ring oscillator circuit and apply the at least one body bias voltage to a group of transistors on the integrated circuit different from those of the ring oscillator circuit and monitor circuit.
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Accused Products
Abstract
An integrated circuit device can include at least one oscillator stage having a current mirror circuit comprising first and second mirror transistors of a first conductivity type, and configured to mirror current on two mirror paths, at least one reference transistor of a second conductivity type having a source-drain path coupled to a first of the mirror paths, and a switching circuit coupled to a second of the mirror paths and configured to generate a transition in a stage output signal in response to a stage input signal received from another oscillator stage, wherein the channel lengths of the first and second mirror transistors are larger than that of the at least one reference transistor.
514 Citations
16 Claims
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1. An integrated circuit device, comprising:
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at least one oscillator stage that includes a current mirror circuit comprising first and second mirror transistors of a first conductivity type, and configured to mirror current on two mirror paths, at least one reference transistor of a second conductivity type having a source-drain path coupled to a first of the mirror paths, and a switching circuit coupled to a second of the mirror paths and configured to generate a transition in a stage output signal in response to a stage input signal received from another oscillator stage, wherein the channel lengths of the first and second mirror transistors are larger than that of the at least one reference transistor;
whereinthe at least one oscillator stage includes a plurality of oscillator stages connected as ring oscillator circuit, with stage output signals of each oscillator stage being coupled to an input of another oscillator stage; and body bias circuits configured to generate at least one body bias voltage in response to the ring oscillator circuit and apply the at least one body bias voltage to a group of transistors on the integrated circuit different from those of the ring oscillator circuit and monitor circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An integrated circuit, comprising:
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at least one oscillator stage comprising, a current mirror circuit comprising mirror transistors of a first conductivity type configured to mirror current drawn through a reference node at a mirror node; at least one reference transistor of a second conductivity type having a drain coupled to a switching circuit configured to generate at least one stage output signal in response to at least one stage input signal, the switching circuit including, a first switching transistor with a source coupled to the mirror node and a gate coupled to a stage input, and a second switching transistor with a source-drain path in series with the source drain path of the first switching transistor, and a gate coupled to the stage input;
whereinthe stage input is coupled to receive the at least one input signal from another stage of the oscillator;
whereinthe at least one oscillator stage is operable in an active mode in which a signal propagates through the switching circuit according to a current flowing through the reference transistor, and an inactive mode in which substantially no current flows through the reference transistor and switching circuit. - View Dependent Claims (10, 11, 12, 13)
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14. A method, comprising:
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in a stage of a ring oscillator circuit, mirroring a reference current flowing through a reference transistor with a current mirror circuit to generate a mirrored current, the current mirror circuit comprising mirror transistors of a first conductivity type having channels lengths substantially larger than that of the reference transistor, and controlling transitions in a stage output signal in response to a stage input signal with a switching circuit according to the mirrored current, wherein the stage input signal is a stage output signal of another stage of the ring oscillator circuit generating a body bias in response to an oscillating signal generated by the ring oscillator circuit; and applying the body bias to transistors of an integrated circuit that includes the ring oscillator circuit. - View Dependent Claims (15, 16)
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Specification