In this paper, a square-root domain band-pass filter and biquad filter which are based on the MOSFET square law are proposed. Both of the square-root domain filters operated at 2.5 V supply voltage are constituted by current mirrors, current-mode square-root circuits and capacitors. The circuits presented have been simulated and fabricated using 0.25 µm CMOS process. Both of simulation and measured results which are in good agreement indicate that the center frequency f 0 is not only attainable at megahertz frequencies but also tunable electronically. The proposed circuits have the merits of high frequency operation, tuneability, low power supply voltage operation, low third order intermodulation distortion and low total harmonic distortion.

Safety in taking medicine is important in health care. In this study, we propose a complete concept of an active smart pillbox, which comprises a main control unit, a pill dispenser unit, and an application software (app) for the automatic dispensing of medicine. The smart pillbox employs convolutional neural network image recognition and 3D printing technology. We adopt an Arduino-based platform to control the rotation and stopping of the motor to dispense the required quantity of pills as the first step towards a fully automated process. A smartphone can be connected to the smart pillbox by Bluetooth and be used to set the parameters of the system. This pillbox can be used at home and allows users to set the medication time and pill type from their smartphone using an app. Moreover, it can remind users to take their medicine. The device is very promising for use in home care and clinical practice.

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The widespread need to assess fall risk has generated need for a reliable, inexpensive, and quantifiable clinical measure. In this paper, we propose mStroke, a practical, accurate, and mobile health system that remotely measures fall risk estimation for post stroke patients. Our proposed system is delivered as an application (App) running on our hardware system consisting of two bluetooth low energy (BLE) modular sensor devices and a smartphone. This system uses accelerometer, gyroscope, and magnetometer to measure fall risk within the functional reach test, an accurate single-tasked clinical tool for fall risk assessment. The proposed system has been extensively tested using emulated and real data from Physical Therapy students as well as stroke patients.

A design technique for current-mode square-root domain band-pass filter fabricated in a 0.25 µm CMOS process is presented. The basic building block consists of current-mode current mirrors, square-root circuits and capacitors, and in which the overall supply voltage is reduced by adopting low-voltage level-shift current mirror. Both of the simulation and measured results, which are in good agreement, indicate that the prototype of the bandpass provides tunable center frequency of 4-10 MHz with bias-current-tunable, −26.7 dB total harmonic distortion (THD), and approximately 1.598 mW power dissipation with a 1.5 V supply voltage. Advantages of the proposed filter include high frequency operation, tuneability, low supply voltage operation, low power consumption, and low third order intermodulation distortion.