http://nopr.niscair.res.in/handle/123456789/13091 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/13128 Title: Realization of current-mode KHN-equivalent biquad filter using ZC-CFTAs and grounded capacitors <br/> <br/>Authors: Satansup, Jetsdaporn; Tangsrirat, Worapong <br/> <br/>Abstract: In this paper, a current-mode Kerwin-Huelsman-Newcomb (KHN) filter structure employing four z-copy current follower transconductance amplifiers (ZC-CFTAs) and two grounded capacitors is proposed. The circuit structure has one low-impedance current input and three high-impedance current outputs and enables realizing lowpass, bandpass and highpass current responses simultaneously. The bandstop and allpass responses can also be obtained by connecting appropriate output currents directly without additional devices. The proposed filter is capable of providing an independent current-control of the natural angular frequency (<img src='http://www.niscair.res.in/jinfo/Omega-knot.gif' border=0>) and quality factor (<i>Q</i>) through the transconductance of the ZC-CFTA. Moreover, high-<i>Q</i> value filter can be realized by simply tuning the ratio of ZC-CFTA’s transconductance. To support the theoretical results, the properties of the presented filter using CMOS ZC-CFTA have been verified by simulation results. <br/> <br/>Page(s): 841-846 Mon, 28 Nov 2011 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/13127 Title: Structural parameters and resistive switching phenomenon study on Cd_0.25Co_0.75Fe₂O₄ ferrite thin film <br/> <br/>Authors: Chhaya, U V; Mistry, B V; Bhavsar, K H; Gadhvi, M R; Lakhani, V K; Modi, K B; Joshi, U S <br/> <br/>Abstract: Cadmium substituted cobalt ferrite thin film with nominal composition Cd_0.25Co_0.75Fe₂O₄, has been grown on quartz substrate by chemical solution deposition and their structural and electrical properties have been investigated. Grazing incidence X-ray diffraction (XRD) confirmed single phase spinel structure with nanometer grain size. Atomic force microscopic analysis revealed uniform nano structured growth of about 70 nm average crystallite size. The XRD data have been used to determine the distribution of cations among the tetrahedral and octahedral sites of the spinel lattice and various structural parameters. The cation distribution determined from X-ray diffraction line intensity calculations revealed, 60% octahedral sites occupancy of Cd²⁺-ions in the composition. Four terminal <i style="">I-V</i> measurements show hysteretic curves, suggesting high resistance state (HRS) and low resistance state (LRS) in the film with polarity dependence. Maximum resistance ratio, <i style="">R</i>_high/<i style="">R</i>_low of 57% was observed at room temperature in the Ag/Cd_0.25Co_0.75Fe₂O₄/Ag planar structure. Observed resistance switching is attributed to combined effects, viz., in the LRS, the major fraction of cadmium occupation and electron exchange between Fe³⁺ and Fe²⁺at the B-sites, whereas the HRS shows Schottky-like conduction mechanism at the Ag/Cd_0.25Co_0.75Fe₂O₄interface. <br/> <br/>Page(s): 833-840 Mon, 28 Nov 2011 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/13126 Title: Pressure dependence of bulk modulus for solids based on the first-principles results <br/> <br/>Authors: Singh, P K <br/> <br/>Abstract: K-primed equations of state for solids are more advantageous than the conventional pressure-volume relationships for studying higher derivatives of bulk modulus and thermoelastic properties. The reciprocal K-primed quadratic equation is consistent with the first-principles results determined from the augmented plane wave method for metals, non-metals and diatomic solids, has been studied in the present paper. The values of pressure, bulk modulus and its pressure derivative based on the first-principles in case of different solids are found to satisfy the reciprocal K-primed quadratic equation. <br/> <br/>Page(s): 829-832 Mon, 28 Nov 2011 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/13125 Title: Analysis of Grüneisen parameter and its volume derivatives for NaCl and hcp iron <br/> <br/>Authors: Vijay, A <br/> <br/>Abstract: Several papers published in recent years on the Grüneisen parameter and its volume derivatives, are found to be inconsistent with the thermodynamic constraints developed by Stacey. The shortcomings have been rectified by using the Stacey formulations for the Grüneisen parameter. The results for the volume dependence of the Grüneisen parameter and its higher order derivatives have been presented up to very high pressures for NaCl and hcp iron. <br/> <br/>Page(s): 825-828 Mon, 28 Nov 2011 22:58:59 GMT