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We describe a highly-programmable integrated sustaining amplifier for reconfigurable MEMS-referenced oscillators. The frequency response, voltage gain, and phase shift of the amplifier can be independently controlled using bias currents, thus enabling it to be interfaced with a variety of MEMS devices with resonant frequencies in the 10–120kHz range. The chip, which was designed in 0.5μm CMOS, also...
The performance of superdirective beamforming of a practical circular hydrophone array is investigated. The received signal of a 16-element circular hydrophone array with radius of 0.25m are measured in the anechoic water tank. The array manifold at the frequency of 1.11kHz is obtained. The superdirective beamforming of the circular array is designed and realized. The correctness and effectiveness...
In this paper, a Reference Injected Phase-Locked Loop (PLL-RI) with delay-line ring-type oscillator is employed to implement a low-noise, fast locking integer-N frequency synthesizer. This inductor-less PLL-RI is fabricated in a 1.2V, 130nm RF CMOS process with a 0.5–1.7GHz tracking range in a 0.02 mm2 core area. Simulation and measurement results show phase noise reduction and improved settling behavior...
A novel offset calibration technique with fast convergence rate for high-speed dynamic comparators is presented. The circuit utilizes a multi-rate charge pump circuitry to speed up the calibration process while maintaining the precision which leads to better energy efficiency. The circuit is designed in a 0.13μm CMOS process. Based on Monte-Carlo simulation results the comparator achieves 183.1μV...
We present performance characterization of a bio-potential recording system with an asynchronous readout architecture. The signal processing chain consists of a low-noise bio-potential amplifier, spike detection circuitry, and an address event representation (AER) communication protocol. The system was fabricated in a 0.5 pm CMOS technology. Each stage of the recording system was tested individually,...
This paper reports a low-power low-noise folded-cascode OTA based charge amplifier designed to be used as the front-end amplifier (FEA) for a pyroelectric transducer based respiration monitoring system. The amplifier is designed in 0.5μm standard CMOS process and consumes only 5.4 μW of power with 1.8V supply voltage. The operational transconductance amplifier (OTA) adopts a pseudo-resistor based...
Silicon based Physical Unclonable Function (SPUF), a chip level identifier that utilizes the inherent irregular manufacturing process variations, can be extended to Ring Oscillator PUFs (ROPUFs). The ROPUF structure, although promising for FPGA based platforms, is not area efficient in terms of response bit per RO circuit implementation. This paper introduces an area efficient Stage Configurable ROPUF...
Electrochemical Impedance Spectroscopy is widely popular in the medical field where it is often referred to as bioelectrical impedance analysis (BIA) used to analyze biological materials as well as characterization of body fluids. It is a complex technique requiring expensive equipment that is also large making it difficult to integrate into small form-factor systems that are hand-held, wearable and...
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