Abstract: An apparatus for sensing distributed load currents provided by power gating circuit. The apparatus includes a power gating circuit including a set of bulk transistors coupled in series with a set of circuits between first and second voltage rails. The apparatus includes a current sensor with a first ring oscillator, a first frequency-to-code (FTC) converter, a second ring oscillator, a second FTC converter, and a subtractor. The first ring oscillator includes a first set of one or more inverters configured to receive a first voltage at a node between the power gating circuit and the first circuit, and a second set of one or more inverters configured to receive a second voltage at a second node between the power gating circuit and the second circuit. The first ring oscillator is configured to generate a signal including a frequency related to the voltage drops across the first and second sets of transistors.

Abstract: Aspects of the disclosure are directed to a low noise physically unclonable function (PUF) cell. In accordance with one aspect, the low noise physically unclonable function (PUF) cell includes a first inverter, wherein the first inverter is configured in a negative feedback configuration; and a second inverter coupled to the first inverter in a series configuration, wherein the second inverter is configured in a first open loop configuration.

Abstract: Certain aspects of the present disclosure provide apparatus and techniques for sensing a temperature. For example, certain aspects of the present disclosure may provide a temperature sensing circuit. The temperature sensing circuit may include a first current mirror having a first branch coupled to a first transistor, a resistive element coupled between a source of the first transistor and a reference potential, and a second current mirror having a first branch coupled to a second transistor. In certain aspects, a source of the second transistor may be coupled to the reference potential, and a gate of the first transistor may be coupled to a gate of the second transistor. In certain aspects, the temperature sensing circuit may also include an oscillator having an input coupled to a third transistor of the second current mirror.

Abstract: An apparatus for sensing distributed load currents provided by power gating circuit. The apparatus includes a power gating circuit including a set of bulk transistors coupled in series with a set of circuits between first and second voltage rails. The apparatus includes a current sensor with a first ring oscillator, a first frequency-to-code (FTC) converter, a second ring oscillator, a second FTC converter, and a subtractor. The first ring oscillator includes a first set of one or more inverters configured to receive a first voltage at a node between the power gating circuit and the first circuit, and a second set of one or more inverters configured to receive a second voltage at a second node between the power gating circuit and the second circuit. The first ring oscillator is configured to generate a signal including a frequency related to the voltage drops across the first and second sets of transistors.

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be used for detecting an incorrect clock frequency. In one example, the apparatus includes a first circuit configured to compare a clock signal period to a delay period. Additionally, in one example, the apparatus includes a second circuit configured to output a first signal. The period of the first signal may be double the clock signal period when the clock signal period is greater than the delay period. The apparatus may, in one example, also include a third circuit configured to output a second signal. The period of the second signal may be greater than double the clock signal period when the clock signal period is greater than the delay period.

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be used for detecting an incorrect clock frequency. In one example, the apparatus includes a first circuit configured to compare a clock signal period to a delay period. Additionally, in one example, the apparatus includes a second circuit configured to output a first signal. The period of the first signal may be double the clock signal period when the clock signal period is greater than the delay period. The apparatus may, in one example, also include a third circuit configured to output a second signal. The period of the second signal may be greater than double the clock signal period when the clock signal period is greater than the delay period.

Abstract: A signal generator configured to generate an oscillating signal with a temperature-compensated frequency. The signal generator includes a ring oscillator, and a complementary to absolute temperature (CTAT) current generator configured to generate a CTAT current for the ring oscillator to temperature-compensate the frequency of the oscillating signal.