By Topic

Parts, Materials and Packaging, IEEE Transactions on

Issue 1 • Date March 1970

Filter Results

Displaying Results 1 - 5 of 5
  • Who's Who in G-PMP

    Publication Year: 1970 , Page(s): 2
    Save to Project icon | Request Permissions | PDF file iconPDF (124 KB)  
    Freely Available from IEEE
  • Analytical Calculation of Metallized-Hole Resistance

    Publication Year: 1970 , Page(s): 26 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (976 KB)  

    The resistance of metallized holes which connect diffcrent levels of metallization in an electronic package, is calculated by solving the 3-dimensional Laplace equation. The metallized hole considered is cylindrical with current flowing in and out through conducting lines. Four configurations are studied. Extensive tables giving normalized values of resistance haw; been obtained through computer calculation. The dimensions of the metallized hole and conductors are normalized with respect to the height of the hole, and in this way a wide range of geometries is dealt with. One important observation from these calculations is the strong dependence of the resistance on the geometry of the conductors carrying the current in and out of the metallized hole. An average current density can be obtained through the use of an equivalent conductor resistance for the metallized hole. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Flame-Sprayed Barium Titanate as a Capacitor Dielectric

    Publication Year: 1970 , Page(s): 3 - 11
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1120 KB)  

    Barium titanate has been known as a high-dielectric-constant material and used widely in the electronic industry. Therefore many attempts have been made to use this material as thin sheets or coatings~ but its refractory properties and the difficulty involved in vaporizing it have prevented its extensive use. The flame-spraying process has solved this problem in an economical way, requiring no vacuum chamber, no critical materials, and no costly electrodes such as platinum. A film as thin as 30 µm with a dielectric constant of more than 6000 can be made on iron tape 30 mm wide and 0.1 mm thick at a very low cost. The film thus produced shows many favorable characteristics and performance that cannot be expected from other dielectric films of comparable dielectric constant. This includes capacitance change of plus/minus 15 percent over a temperature range of -55 to +125°C for a film having a dielectric constant of 3000. The flame-sprayed coatings consist essentially of crystalline and glassy components. The crystalline component comprises cubic and tetragonal crystallites. The tetragonal crystallites have a variety of axial ratios (c/a). Applications presently considered for this material are fixed capacitors, variable capacitors, chip capacitors for hybrid IC circuits, and substrates for capacitor networks and/or RC networks. As an extension of this research, semiconducting barium titanate is also discussed here. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New Tables for the Mutual Inductance of Coaxial Cylindrical Coils

    Publication Year: 1970 , Page(s): 12 - 19
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1424 KB)  

    Tables for the calculation of mutual inductance be· tween coaxial cylindrical coils are presented. 'They are based on electromagnetic theory formulas, which, while available for quite time, have not hitherto been tabulated. The use of these tables is explained by examples and definitions of the tabulated functions are given. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New Technique for Electronic Tuning of VHF Power Amplifiers

    Publication Year: 1970 , Page(s): 20 - 25
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (792 KB)  

    A technique is described for high-speed electronic tuning of an inductive device capable of handling VHF powers in excess of 100 watts CW. Electronic tuning is accomplished by means of a controlled dc bias applied to an inductor with a ferrite core. The orthogonal relationship of the applied dc magnetic bias and the absorption and dispersion of the ferrite is fundamental to circumventing problems that hitherto have limited the use of ferrite in magnetically tuned circuit,,; handling RF power. As opposed to conventional magnetic-bias tuning, the ferrite core is operated above saturation. In this mode, it is seen that the ferrite cores can be operated with high RF fields with no detectahle degradation of Q and negligible distortion products. Specific examples are presented of file application of this new capability in medium-power amplifiers operating over the frequency range of 70-300 MHz. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

This Transaction ceased production in 1971. The current publication is titled IEEE Transactions on Components, Packaging, and Manufacturing Technology.

Full Aims & Scope