1
Benton H Calhoun, Aatmesh Shrivastava: Methods and apparatus for a single inductor multiple output (SIMO) DC-DC converter circuit. UNIVERSITY OF VIRGINIA PATENT FOUNDATION, Westerman Hattori Daniels & Adrian, July 4, 2017: US09698685 (3 worldwide citation)

In some embodiments, an apparatus includes a single-inductor multiple-output (SIMO) direct current (DC-DC) converter circuit, with the SIMO DC-DC converter circuit having a set of output nodes. The apparatus also includes a panoptic dynamic voltage scaling (PDVS) circuit operatively coupled to the S ...


2
Benton H Calhoun, Aatmesh Shrivastava: Low input voltage boost converter with peak inductor current control and offset compensated zero detection. UNIVERSITY OF VIRGINIA PATENT FOUNDATION, Westerman Hattori Daniels & Adrian, April 26, 2016: US09325240 (3 worldwide citation)

The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEA ...


3
Benton H Calhoun, David D Wentzloff: Systems, methods, and apparatus for controlling the power-on or boot sequence of an integrated circuit based on power harvesting conditions. PsiKick, Cooley, March 22, 2016: US09292301 (1 worldwide citation)

In some embodiments, an apparatus includes an integrated circuit such as a system on chip that operates in part from harvested power and that uses information about power harvesting conditions to alter a power-on sequence or boot sequence based on that information. In some embodiments, a method uses ...


4
Benton H Calhoun, Randy W Mann: Memory cell. UNIVERSITY OF VIRGINIA PATENT FOUNDATION, Kilpatrick Townsend & Stockton, May 10, 2016: US09337204 (1 worldwide citation)

Memory cells are described with cross-coupled inverters including unidirectional gate conductors. Gate conductors for access transistors may also be aligned with a long axis of the inverter gate conductor. Contacts of one inverter in a cross-coupled pair may be aligned with a long axis of the other ...


5
Benton H Calhoun, Aatmesh Shrivastava: Low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power. UNIVERSITY OF VIRGINIA PATENT FOUNDATION, Westerman Hattori Daniels & Adrian, April 10, 2018: US09941838

A low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power biases an amplifier for an XTAL in the sub-threshold operating regime. A feedback control scheme can be used to bias the amplifier for an XTAL biased in the sub-threshold operating regime. The am ...


6
Benton H Calhoun, Aatmesh Shrivastava: Low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power. UNIVERSITY OF VIRGINIA PATENT FOUNDATION, Westerman Hattori Daniels & Adrian, May 22, 2018: US09979348

A low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power biases an amplifier for an XTAL in the sub-threshold operating regime. A feedback control scheme can be used to bias the amplifier for an XTAL biased in the sub-threshold operating regime. The am ...


7
Benton H Calhoun, Brian Otis: Energy harvesting and control for sensor node. UNIVERSITY OF VIRGINIA PATENT FOUNDATION, UNIVERSITY OF WASHINGTON THROUGH ITS CENTER FOR COMMERCIALIZATION, Westerman Hattori Daniels & Adrian, January 30, 2018: US09882428

An integrated circuit, such as included as a portion of a sensor node, can include a regulator circuit having an input coupleable to an energy harvesting transducer. The integrated circuit can include a wireless receiver circuit coupled to the regulator circuit and configured to wirelessly receive a ...


8
Benton H Calhoun, Aatmesh Shrivastava: Methods and apparatus for a single inductor multiple output (SIMO) DC-DC converter circuit. University of Virginia Patent Foundation, Weaver Austin Villeneuve & Sampson, January 1, 2019: US10170990

In some embodiments, an apparatus includes a single-inductor multiple-output (SIMO) direct current (DC-DC) converter circuit, with the SIMO DC-DC converter circuit having a set of output nodes. The apparatus also includes a panoptic dynamic voltage scaling (PDVS) circuit operatively coupled to the S ...


9
Benton H Calhoun, Joseph F Ryan: Sub-threshold FPGA and related circuits and methods thereof. University of Virginia Patent Foundation, Robert J Decker, Westerman Hattori Daniels & Adrian, November 3, 2015: US09178518

A sub-VT FPGA uses a low swing, dual-VDD interconnect scheme to reduce FPGA area per LUT, delay at a constant energy, and energy at a constant delay relative to a conventional design at low voltage. These improvements are made possible by a custom asynchronous sense amp, a separated voltage for memo ...


10
Benton H Calhoun, Aatmesh Shrivastava: Low power clock source. University of Virginia Patent Foundation, Westerman Hattori Daniels & Adrian, March 7, 2017: US09590638

An ultra-low power clock source includes a compensated oscillator and an uncompensated oscillator coupled by a comparator circuit. In an example, the compensated oscillator is more stable than the uncompensated oscillator with respect to changes in one or more of temperature, voltage, age, or other ...