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This paper presents the design of a novel controller for a reconfigurable filter for the front end of an optical blood Oxygen sensor. The reconfigurability of the filter is dependant on the magnitude of the diode's current and is implemented with a feed forward loop from the ADC output. A relation between the output of the diode and the noise in the signal is proven in this paper. The reconfigurable...
The distinctive challenges for design of read-out ASICs for radiation detectors in biomedical applications originate from the need to be interfaced to detectors with high density of pixels and process photons with high rates. Those two dominant factors impose a range of conflicting restrictions and demands on the design of the readout integrated circuits (ROIC). Some of the key challenges are: limited...
This paper presents the implementation of ratiometric algorithm based on the Stern-Volmer principle to compute partial pressure of oxygen. The algorithm block sits in a novel bio-signal processor designed for a portable blood oxygen analyzer. The key design constraints of the equation implementation are accuracy (to compete with the traditional blood gas analyzer) and power consumption (to make the...
The fabricated analog application specific integrated circuit (ASIC) is a front-end circuit for multichannel pixel detector system. The designed ASIC provides signal amplification for a pixelated arrays of 1 mm and 200 ??m pitch pixel detectors made from cadmium telluride (CdTe) and cadmium zinc telluride (CZT) detector. Both the detector and ASIC are combined to target future high intensity research...
Measurement of interface pressure between the foot and shoe underpins a number of important applications in gait analysis. Abnormal pressure may indicate instability in gait, risks of ulceration development especially in diabetic foot as well as many other biomedical diagnostic applications. Since the currently available foot pressure sensors exhibit many limitations while the opportunity offered...
This paper presents a fully integrated single-ended low noise amplifier (LNA) for GSM (GSM850 and GSM900) and UMTS (UMTS Band V and VI). The design and implementation is based on inductively-degenerated common-source (IDCS) using 0.18 μm CMOS technology with on-chip inductors at the input circuit for input matching and extra on-chip RL components at load tank for output matching. Post layout simulation...
A single-ended wideband low noise amplifier (LNA) for GSM (DCS1800, PCS1900) and WCDMA (Band I to IV) were designed and implemented using 0.18 mum CMOS technology. The circuit topology is based on inductively-degenerated common-source (IDCS) using on-chip inductors at the input circuit for input matching and shunt-peaking components for bandwidth enhancement at load tank. Post layout simulation results...
The measurement of interface pressure between the foot and shoe is important in gait analysis and other health diagnosis. Abnormal pressure may indicate instability in gait, risks of ulceration development especially in diabetic foot as well as have many other biomedical diagnostic applications. However, the currently available foot pressure sensors show a number of weaknesses that limit their performance...
Measurement of the foot and shoe interface pressure underpins a number of important applications. Abnormal pressure may indicate instability in gait, risks of diabetic ulceration and many other biomedical and sports applications. As the current foot pressure sensors in the market exhibit many limitations, a new sensor design based on the more promising MEMS technology was therefore explored. As such,...
The foot clearance above the ground is an important clinical and rehabilitation gait analysis parameter. Current bulky and laboratory environment based instruments are not suitable for measurement in the natural environment such as the outdoors. MEMS technology can be used with integration of microelectronic circuitry to enable realization of tiny and efficient devices for this application. This paper...
A single-ended low noise amplifier (LNA) for a multi-standard (800 to 1000 MHz) mobile receiver that covers GSM and 3G respectively, has been designed and simulated in a 0.25 mum CMOS technology process. This LNA makes part of a larger system to cover GSM and 3G bands from 800 to 2100 MHz but this work only focuses on lower bands. The circuit topology is based on inductively degenerated common source...
A single-ended wideband low noise amplifier for a multi-standard (1.8 GHz to 2.1 GHz) mobile receiver has been designed and simulated in a 0.25 μm CMOS technology process. The circuit topology is based on inductively degenerated common source (IDCS). The enhancement for bandwidth was performed using inductive shunt-peaking that added more freedom to the circuit. Circuit simulation results shows a...
This paper presents the implementation of a high speed low power over sampled CMOS comparator for use in a reconfigurable flash analog to digital converter (ADC) as part of a direct sequence - spread spectrum (DS-SS) based ultra wide band (UWB) radio receiver. The comparator was designed using a 90 nanometre (nm) CMOS technology process. The switching speed of the comparator is 4 giga-samples per...
Blood gasses are one of the vital signs monitored by medical practitioners for critically ill patients and as preventive health care measures for potential heart disease patients. Measurement of blood gasses in a quick, effective way, without compromising on accuracy is one of the fundamental topics for research today and is in tune with the demands of the medical fraternity. The objective of this...
This paper analyses handover scenario used in 3G standard and results are used to design and implement a reconfigurable voltage controlled oscillator (VCO) for multistandard wireless receiver. The third-generation (3G) standard has introduced hybrid wireless network for better use of resources. The typical example of hybrid network is integration of radio access technologies such as Wideband Code...
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