Agency for Science, Technology and Research

Globalfoundries Singapore Pte. Ltd.

National University of Singapore

Shanghai Jiaotong University

Chun Huat Heng

Yuan Gao

San Jeow Cheng

Yong Lian

Minkyu Je

Yuanjin Zheng

Zhihong Luo

Benjamin Shui Chor Lau

Lei Zeng

Boxiao Liu

I Made Darmayuda

An electrical impedance tomography system with frequency division multiplexing based data compression comprising electrodes, a connecting line, an electrical impedance tomography chip, a universal serial bus and a computer. The present invention realizes the proposed electrical impedance tomography system by innovative application of frequency division multiplexing technology, and has the advantages of low power consumption and improved hardware overheads. The architecture of the 13-channel electrical impedance tomography chip introduced in the embodiment of the present invention, which applies the frequency division multiplexing based data compression technology, has taped out using CMOS 0.13 micrometer process; the power consumption per channel turns out to be 118 microwatts and the area is 0.87 square millimeters, verifying the effectiveness of the present invention. The present invention can also be migrated to other applications of electrical impedance tomography.

Electrical impedance tomography with FDM-based data compression

In various embodiments of the present disclosure, there is provided an energy harvesting apparatus, including: an energy harvester for generating electric power from an ambient source; a power conditioning circuit coupled to the output of the energy harvester; including: a boost converter module; a buck-boost converter module; and a power modification control module; wherein the power modification control module is configured to initialize the energy harvesting apparatus from inactivity to a normal energy harvesting state by operating the boost converter module, and operating the buck-boost converter when an output voltage of the power conditioning circuit rises to a predetermined value. A corresponding method of operating an energy harvesting apparatus is provided.

Energy harvesting apparatus and a method for operating an energy harvesting apparatus

Redundant inverters with multiple inverter stages enable lower operating voltages to be used. For example, the use of multiple inverter stages produces a strong '0' or a strong '1' output signal. The strong output signal facilitates self-oscillation of a ring oscillator at lower voltages.

Ultra low voltage ring oscillator with redundant inverter

According to embodiments of the present invention, a frequency shift keying transmitter is provided. The frequency shift keying transmitter includes a logic gate arrangement that produces an output signal having a frequency that depends on input signals to the logic gate arrangement, a clock generator coupled to the logic gate arrangement, the clock generator adapted to produce a clock signal, and a sampling arrangement coupled to the logic gate arrangement, the sampling arrangement adapted to receive a data signal, wherein the sampling arrangement is configured to sample the clock signal to generate periodic waveforms delayed from each other by an interval determined by the point the clock signal is sampled, wherein the sampling arrangement is configured to be controlled by the data signal to have the logic gate arrangement select periodic waveforms that are delayed from each other by one of a set of intervals associated with the data signal, to be used as the input signals to the logic gate arrangement to produce the output signal.

Frequency shift keying transmitter

According to embodiments of the present invention, a transmitter is provided. The transmitter includes a frequency shift keying (FSK) circuit, and a phase shift keying (PSK) circuit coupled in series to the FSK circuit, wherein the FSK circuit is configured, in a first mode of operation, to provide a FSK modulated signal to the PSK circuit, and, in a second mode of operation, to provide a fixed frequency signal to the PSK circuit, and wherein the PSK circuit is configured, in the first mode of operation, to transmit the FSK modulated signal, and, in the second mode of operation, to provide a PSK modulated signal based on the fixed frequency signal received from the FSK circuit.

Transmitter

Growing community of inventors

Singapore, Singapore

Chun Huat Heng