In this paper, we demonstrate a novel non-invasive, wearable impedance sensor. The sensor, using an to frequency measurement, with two modes of resistance and capacitance measurement is implemented in CMOS 130 nm technology. sensor consisting current voltage comparators for different mode has low power consumption 30 μW per channel. demonstrated applications, thoracic hand gesture recognition. Thoracic based on modulation through fluid accumulation. Hand gestures are detected tissue sensing....

This paper presents board level instrumentation of a non-invasive pyroelectric transducer based respiration monitoring system. The system includes electronic components for detection apnea which is one the major respiratory disorders among premature neonatal infants. overall design offers compact, light-weight, low-cost and convenient as an alternative to bulky expensive systems currently used in intensive care units. In addition, incorporates wireless transmission breathing signal remote...

Silicon photomultipliers (SiPMs) offer advantages such as lower relative cost, smaller size, and operating voltages compared to photomultiplier tubes. A SiPM’s readout circuit topology can significantly affect the characteristics of an imaging array. In nuclear detection, energy, timing, position are primary interest. Nuclear has applications in medical, astronomy, high energy physics fields, making SiPMs active research area. This work is focused on topologies required for imaging. We...

This paper presents a design of an ultra low-power operational transconductance amplifier (OTA) intended for biomedical applications and realized in 0.18 gm CMOS technology. The proposed OTA take advantages bulk-driven scheme to reduce power consumption. uses single 0.8 V supply dissipates 5.5 pW provides 70 dB gain which makes it suitable use as main block many including implantable wearable sensors. simulation results are compared with conventional structures some recent works indicate...

This paper presents a low-power voltage clamped CMOS pH readout circuit. The novelty of this design lies in an ISFET to frequency conversion using clamping topology. proposed system, designed commercial 180 nm technology, achieves minimum supply and power consumption through subthreshold MOSFET operation. Simulation results the circuit show that provides average sensitivity 40 mV/pH for front end 6.92 MHz/V 138 kHz/pH overall system with sensing area 80 μm × over 1-14 range. A 10 shows 27...

This paper presents a monolithic pH measurement system with power conditioning for supply derived from harvested energy. The proposed includes low-power highly linear readout circuits wide values (0-14) and unit based on low dropout (LDO) regulator. circuit provides squarewave output the frequency being corresponding to input values. To achieve that, simple operational transconductance amplifier is employed linearly convert sensor voltage current. overcome process variations, calibration...

In a typical wireless transmission of medical data from implantable sensors devices Medical Implant Communication System (MICS) protocol with low-power, short-range (~2m), high-data-rate, 401-406 MHz communication network scheme is employed. This paper presents digital voltage-controlled oscillator (DVCO) featuring low-power consumption, wide tuning range, and low phase noise suitable for use in biomedical employing MICS protocol. The circuit realized 0.13-μm standard CMOS process consumes...

Silicon photomultipliers, SiPM, in conjunction with scintillators are used nuclear imaging and detection. This paper demonstrates a transimpedance amplifier, TIA, designed fabricated 0.18 μm standard CMOS process. The TIA is compatible both custom commercial SiPMs. bulk driven amplifier the topology enables system to operate lowered power supply. Experimental measurements show proposed has 65 dB open loop gain, while consuming 0.4 μW. been simulated two SiPMs SPICE verify its functionality....

We present the development of a graphite-based sensor interfaced with custom potentiostat circuit for electrochemical detection. Paper-based electrodes offer significant cost advantage compared to fabricated using standard clean room microfabrication techniques. The three-electrode system used in this paper does not use inks or pastes, and can be prepared easily by writing on chromatography store-bought pencils. electrode fabrication procedure is simple uses widely available materials making...

In this work, we report the development of a detection system based on amplifiers coupled with silicon photomultiplier (SiPM). A bulk driven OTA was fabricated in 180 nm process and experimentally characterized light source. The performance, when configured as transimpedance amplifier, compared to discrete amplifier implementation. Both had approximately 70 dB open loop gain. were used closed configuration verified gamma check source scintillator. energy resolution using commercial 14.2% for 8.6%.