University of Michigan

Taekwang Jang

David Theodore Blaauw

Dennis Sylvester

Hun-Seok Kim

Cynthia Anne Chestek

Paras Patel

Myungjoon Choi

Jamie Phillips

Jongyup Lim

Eunseong Moon

Julianna Richie

Michael Barrow

Samuel Nason

Inhee Lee

A mote includes an optical receiver that wirelessly receives a power and data signal in form of NIR light energy within a patient and converts the NIR light energy to an electrical signal having a supply voltage. A control module supplies the supply voltage to power devices of the mote. A clock generation circuit locks onto a target clock frequency based on the power and data signal and generates clock signals. A data recovery circuit sets parameters of one of the devices based on the power and data signal and a first clock signal. An amplifier amplifies a neuron signal detected via an electrode inserted in tissue of the patient. A chip identifier module, based on a second clock signal, generates a recorded data signal based on a mote chip identifier and the neuron signal. A driver transmits the recorded data signal via a LED or a RF transmitter.

Wireless neural recording devices and system with two stage RF and NIR power delivery and programming

A temperature insensitive sub-nA current reference is presented with pA-range power overhead. The main concept is to linearly reduce the gate voltage of a sub-threshold-biased MOSFET as temperature increases, in order to compensate for exponential dependence of drain current on temperature. For example, a MOSFET-only, 20 pA, 780 ppm/&#xb0; C. current reference that consumes 23 pW is disclosed, marking the lowest reported power among current references. The circuit exploits sub-threshold-biased MOSFETs and a complementary-to-absolute temperature (CTAT) gate voltage to compensate for temperature dependency. The design shows high immunity to supply voltage of 0.58%/V and a load sensitivity of 0.25%/V.

Ultra low power temperature insensitive current source with line and load regulation

Oscillator regulation circuitry is provided for regulating a frequency of an output signal generated by an oscillator. Oscillator regulation circuitry has frequency sensing circuitry for sensing the frequency of the output signal and generating a first signal depending on the frequency, and control circuitry which generates the oscillator control signal based on the comparison between the first signal and a non-oscillating reference signal. The frequency sensing circuitry includes at least one switched capacitor. This approach provides improved noise reduction, less sensitivity to process, temperature and voltage variations, and a more linear scaling of the frequency with the reference signal, compared to previous techniques.

Oscillator regulation circuitry and method

Growing community of inventors

Ann Arbor, MI, United States of America

Taekwang Jang