A fully integrated low-noise amplifier (LNA) with 0.4V supply voltage and ultra-low power consumption at 1.5GHz by folded cascode structure is presented. The proposed LNA is designed in a TSMC 0.18 μm CMOS technology, in which the all transistors are biased in sub-threshold region. Through the use of the proposed circuit for the gain enhancement in this structure and using forward body bias tec...

In this paper, the underlying concept of acoustic liner is an electroacoustic transducer which acoustic impedance can be changed by electrical means, be it passive or active. Among the different ways to obtain variable acoustic properties on an electroacoustic transducer's voicing face is the shunting of the transducer's electrical input. With such shunt devices, the acoustic impedance that the...

This study presents a novel miniaturized dual-band coupled-line impedance transformer. This dual-band matching technique uses the characteristics of coupled-line and dual-band stubs to realize matching arbitrary complex impedance to arbitrary complex impedance at two arbitrary uncorrelated frequencies. Especially, it satisfies the demand of dual-band matching at two relatively closed operating ...

The challenge in designing a broadband microwave amplifier is the fact that the input impedance at lower frequencies is practically an open circuit, and at higher frequencies predominantly capacitive and can be almost a short. This makes broadband matching difficult. For example, the TriQuint device we used for the project has an input impedance that is practically an open circuit at 0.1GHz, is...

Interest in local field potentials (LFPs) and action potential shape has increased markedly. The present work describes distortions of these signals that occur for two reasons. First, the microelectrode recording circuit operates as a voltage divider producing frequency-dependent attenuation and phase shifts when electrode impedance is not negligible relative to amplifier input impedance. Becau...

In this paper the active device for a class E amplifier is modelled as switch in series with a turn on resistance ‘Ron’. Assuming an ideal harmonic load is used the switch equations for the voltage and current waveforms are reviewed and then used to examine how ‘Ron’ affects the efficiency of dc to ac power conversion. This ideal harmonic network is assumed to have optimum input impedance at th...

Underwater optical wireless communication (UOWC) has great potential to provide high-speed and intensive communications over short ranges underwater. However, the mobility of UOWC system is limited by strict alignment requirements between transceivers. In this paper, a multi-degree-of-freedom (MDOF) with high flexibility improved transmission performance proposed experimentally demonstrated bas...

Design and fabrication of a low cost sensor for measuring electric field over a broad range of electromagnetic (EM) frequency is presented. The electric field probe consists of an electrically short dipole antenna and diode detector connected to an instrumentation amplifier via a high impedance line. The rectified diode voltage is conveyed over the high impedance line for real time data acquisi...

The rapid progress in nanoelectronics showed an urgent need for microwave measurement of impedances extremely different from the 50Ω reference impedance of measurement instruments. In commonly used methods input impedance or admittance of a device under test (DUT) is derived from measured value of its reflection coefficient causing serious accuracy problems for very high and very low impedances...

This study quantifies the dynamic attachment and spreading of porcine pulmonary artery endothelial cells (PPAECs) on optically thin, indium tin oxide (ITO) biosensors using simultaneous differential interference contrast microscopy (DICM) and electrical microimpedance spectroscopy. A lock-in amplifier circuit monitored the impedance of PPAECs cultivated on the transparent ITO bioelectrodes as a...