Stmicroelectronics (crolles 2) Sas

Guenole Lallement

Fady Abouzeid

A digital circuit includes logic circuitry formed by logic gates. Each logic gate includes a p-channel MOSFET and an n-channel MOSFET. A body bias generator circuit applies an n-body bias voltage to the n-body bias nodes of the p-channel MOSFETs and applies a p-body bias voltage to the p-body bias nodes of the n-channel MOSFETs. The body bias generator circuit operates in: a first mode to apply a ground supply voltage to the n-body bias nodes of the logic gates as the n-body bias voltage and apply a positive supply voltage to the p-body bias nodes of the logic gates as the p-body bias voltage; and a second mode to apply the positive supply voltage to the n-body bias nodes of the logic gates as the n-body bias voltage and apply the ground supply voltage to the p-body bias nodes of the logic gates as the p-body bias voltage.

Body biasing for ultra-low voltage digital circuits

A multi-stage ring oscillator generates an output clock signal having a frequency which is dependent on a digitally leakage current that is applied to each stage of the multi-stage ring oscillator. A magnitude of a leakage current sourced by each digitally controlled leakage current source is set by a control circuit in response to a selection signal. A calibration circuit processes a reference clock signal and the output clock signal generated by the multi-stage ring oscillator to make adjustment to the selection signal which drives a locking of a frequency of the output clock signal to a desired frequency.

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Grenoble, France

Guenole Lallement