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This paper presents a magnetic characterization technique based on the analysis of respective magnetization curves of the soft ferrites materials under test. The magnetic properties in low external magnetic field are explored for those materials. The method applies an alternating electric current through the coil to magnetize the ferromagnetic materials used as a core. Due to the change in current,...
Operational amplifier (Op amp) is the most integral part of an embedded circuit building block. In this paper, the testing of an integrated Op amp suitable use for capacitance and high speed measuring system has been made. The Op amp testing (such as large signal differential transfer characteristic, frequency respond analysis, input common mode analysis, slew rate analysis) has been done using the...
A wireless power supply system based on inductive coupling approach has been developed for implantable biomedical devices that achieves excellent transducer performance by obviating the need for electrical connectors. In this paper, we report in detail the modeling and electrical analysis of an inductive power link for activation of microwatt electronic implants. As the biomedical application requires...
A low-power quaternary comparator circuit using current-mode CMOS multiple-valued logic (MVL) circuits has been presented in this paper. Existing MVL comparator circuits consume high power. The circuit presented in this paper has been shown low power digital output. It has been simulated with PSPICE using the transistor model parameter values of the BSIM3 NMOS model V3.2 for 0.13 μm CMOS process....
This paper details the design and analysis of a novel MEMS fully differential capacitive sensor which can be used to measure the parameter related to force changes, such as pressure or acceleration. This MEMS model uses a new structure to get extremely high resolution of 11.6fF/KPa. Further it has a good level of linearity as regard changes in capacitance as a function of force change.
Transducers and sensors play an important role in instrumentation and measurement. Expectations from non-contact biomedical implants are getting renewed interests among researchers. A novel work is carried by presenting a non-contact technique as an inductive transducer coils. A theoretical analysis of an inductive transducer is given which is followed by a development of non-contact measurement technique...
A 2-bit higher radix analog-to-digital converter (ADC) circuit consisting of a combination of a pipelined ADC(and a set of cascaded current comparator cell has been proposed. The ADC generates multi-valued logic outputs rather than the conventional binary output system. The design is implemented using 0.13|im CMOS process. The performance analysis of the design shows desirable performance parameters...
The objective of this paper is to provide a lower range capacitance value in a wider range of detection to be used in high frequency system. This is achieved by designing the Op-amp using CMOS 0.13-μm technology using switched-capacitor technique. Evaluation of the circuit is based on analytical approach and the simulation is carried out using the PC based Simulation Program for Integrated Circuit...
This paper presents the design and analysis of an interface circuit for MEMS or biomedical sensor applications. This circuitry performs the function of an analog-to-digital converter. A first-order 1-bit sigma-delta (Σ-Δ) analog-to-digital converter is designed and simulated using Silterra 0.13μm CMOS process technology with power supply of 1.2V through Cadence. Then the circuit simulation results...
Differential Resistive Sensor Interface is industrially significant for GSM/GPRS transmission to a mobile phone in order to enhance communication technique. The Sensor output needs to be made digital, hence the need for a microcontroller and the signal is displayed in a PC as output voltage, sensed parameter, x. A frequency and voltage output are obtained, showing how a small change in differential...
Transducers are used for many different applications in industry such as liquid-level sensing, PH monitoring, or gas pressure recording. However, sometimes these sensors need to be located in areas where wiring is not possible, such as in application of implanted biomedical devices. Some challenges that that must be overcome include the wireless power supply of sensors, accurate and steady DC reference,...
This paper presents the design and analysis of an integrated oversampling converter with MEMS capacitive sensor. The MEMS capacitive sensor is a comb-drive which provides change in capacitance when change in acceleration is detected. The analog-to-digital converter (ADC) is a first-order 1-bit sigma-delta (Σ-Δ) converter. Σ-Δ ADCs are suitable for MEMS sensors since their output voltage are in mV...
A 0.13-μm complementary metal-oxide-semiconductor (CMOS) technology capacitive measuring system has been proposed for detection a wide range of capacitance variation values by using less than 1.2-V supply voltage. Simulation results have successfully verified the function of the design is able to measure both small and large capacitance variations. Capacitance to Voltage Converter (CVC) system is...
Wave propagation at higher frequencies is highly influenced by rain. The measured rain attenuation data was collected from January 1999 to April 2000 at 15, 23 26, and 38 GHz frequencies for terrestrial microwave links in Malaysia. This research investigated the effects of frequency on the fade slope. The fade slope was analyzed using the measured data and it is found that the distribution for the...
A Ku-Band low noise amplifier has been designed with the gain of 8.90 dB and 2.19 dB noise figure for satellite receiver. The parameters are optimized by using Microwave Office Simulator (AWR) Ver. 2006. The size of the monolithic chip is 0.316 mm2. The LNA is designed to operate at 12 GHz.
The work in this paper is presenting circuits for pulse generation and shaping of pulses for UWB applications. The pulse generation is based on the principle of sending the same pulse over two paths; one traveling straight faces a step recovery diode (SRD) diode while the other is being reflected after meeting the properly terminated short end of a shunt stub, which returns back to the same point...
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