摘要:
A process for preparing a particulate ceramic material comprising the steps of:(a) adding carbon dioxide or an aqueous solution of a soluble carbonate to first aqueous solution of a nitrate or chloride of Ba, Sr, Ca or Mg in a first vessel to adjust the pH of said first aqueous solution to between 7 and 10 thereby forming a carbonate precipitate;(b) adding an aqueous solution of a soluble hydroxide to a second aqueous solution of a nitrate or chloride of Ti, Zr, Sn or Pb in a second vessel to adjust the pH of said second aqueous solution to between 7 and 10 thereby forming a hydroxide precipitate;(c) combining slurries containing the precipitates formed in said first and second vessels;(d) mixing the combined slurries;(e) passing the slurries through a filter;(f) washing the filter cake with water;(g) drying the filter cake to form a powder;(h) calcining the dried powder; and(i) grinding the calcined powder.
摘要:
A process for preparing a powdered ceramic raw material comprises the steps of(a) adding ammonia gas or an alkali to a first aqueous solution containing a water-soluble salt of lead capable of being precipitated as a hydroxide until the pH of the first solution reaches a value within the range of 9 to 10 to form a precipitate of lead hydroxide;(b) adding ammonia gas or alkali to a second aqueous solution containing at least one water-soluble salt or ceramic components other than lead capable of being precipitated as a hydroxide until the pH of the second solution reaches a value within the range of 9 to 10 to form a precipitate of hydroxide of said ceramic components;(c) mixing the resulting reaction mixtures, followed by separation of the precipitates of hydroxides from solution, washing with water and drying; and(d) calcining the precipitate to form complex oxides of said ceramic material.
摘要:
A process for preparing a powdered ceramic raw material, comprising the steps of; (a) adding gaseous carbon dioxide or a precipitant composed of a water-soluble carbonate to the first aqueous solution containing at least one nitrate or chloride of elements selected from the group consisting of Ba, Sr, Ca and Mg until the pH of the solution is reached to a predetermined value within the range of 7 to 10 to precipitate at least one carbonate of said elements, (b) adding ammonia gas or a precipitant composed of an aqueous solution of a water-soluble hydroxide to the second aqueous solution of at least one nitrate or choride of elements selected from the group consisting of Ti, Zr and Sn until the pH of the solution is reached to a predetermined value within the range of 7 to 10 to precipitate at least one hydroxide of said elements, (c) adding ammonia gas or a precipitant composed of an aqueous solution of a water-soluble hydroxide to the third aqueous solution of lead acetate or lead nitrate until the pH of the solution is reached to a predetermined value within the range of 7 to 10 to precipitate lead hydroxide, (d) mixing the carbonate precipitated from the first aqueous solution, the hydroxide precipitated from the second solution, and hydroxide precipitated from the third aqueous solution; and (e) treating the resultant mixture with heat to form complex oxides of said elements.
摘要:
An apparatus for manufacturing a laminated unit of ceramic green sheets comprises an endless belt, and an applying apparatus provided at a predetermined position on the running path of the endless belt. The applying apparatus includes a reservoir for storing a ceramic slurry and a moveable blade. When the belt runs with the blade spaced a predetermined distance from the top surface of the endless belt, the ceramic slurry flows out through a gap between the blade and the belt and, thus, is applied on the belt to a predetermined thickness. The applied ceramic slurry is dried by a drier so as to form a ceramic green sheet. A conductive paste is printed on the top surface of the ceramic green sheet by a printing apparatus. The printed conductive paste is dried by a drier. The ceramic green sheet with the conductive paste printed thereon is brought again to the applying apparatus due to the movement of the endless belt, the blade of the applying apparatus is further displaced upward, and ceramic slurry is applied on the previously formed ceramic green sheet. By repeating such applied again on the ceramic green sheet. By repeating such a process, a laminated unit of the ceramic green sheets is obtained.
摘要:
This invention provides an interface circuit for detecting that a DQS signal from a DDR SDRAM is at an intermediate potential. An interface circuit is connected to at least a signal line which transmits the DQS signal from the DDR SDRAM and reaches an intermediate potential VM when the signal attains an inactive state. The interface circuit has a comparing portion for comparing the potential of the DQS with a threshold potential VREFH which is a potential that is different from the intermediate potential VM.
摘要:
A method of testing an electronic device including first and second semiconductor devices connected to each other with a plurality of bus lines. First, the first semiconductor device supplies a selected one of the bus lines with a first logical output signal. Then, the second semiconductor device acquires a first bus line signal from the selected bus line. The second semiconductor device inverts the first bus line signal to generate a second logical output signal. The second semiconductor device transmits the second logical output signal to the first semiconductor device. The first semiconductor device receives a second bus line signal from the selected bus line. The first semiconductor device compares the first logical output signal and the second bus line signal to detect a connection between the first semiconductor device and the second semiconductor device.
摘要:
Plural transmitter units generate plural currents corresponding to plural logical values, respectively, and propagate the currents to a common signal line. The common signal line synthesizes the currents generated by the transmitter units, and propagates them to a receiver unit as a synthetic current. The receiver unit restores the logical values the transmitter units generated, in accordance with the synthetic current. The values of the currents the transmitter units generate in correspondence with the logical values each differ, so that the value of the synthetic current can be changed for every combination of logical values. Accordingly, the receiver unit can restore the logical values outputted from the respective transmitter units, based on the synthetic current. That is, employing the common signal line enables signals transmitted from the transmitter units to be simultaneously received. Consequently, the number of signal lines laid between the transmitter units and the receiver unit is reduced.
摘要:
It is intended to provide a semiconductor integrated circuit device permitting reading of information specific to chips within the mounted chips while restraining the increase in the total number of terminals of the package and enabling the area of circuits required for reading information specific to chips to be made smaller than that according to the prior art, and a control method therefor. The same terminal is used as the external terminal to which the pulse signals are inputted and the external terminal from which the chip-specific information is outputted. Also, the external terminal for inputting/outputting required power supply in the normal operation mode and the external terminal for reading chip-specific information in the information reading mode are used in common. The increase in the number of external terminals can be thereby restrained. Moreover, the counter unit is shared between functional circuits and the comparative decision unit. This can serve to restrain the increase in chip area.
摘要:
A memory device for ensuring efficient access and reduction in current consumption. The memory device includes a plurality of memory cells arranged in accordance with a first address and a second address which define a logical address map indicating a logical shape of the memory array. An address map changing unit is operatively coupled to the memory array, for receiving a first address signal for generating the first address and a second address signal for generating the second address. The address map changing unit is capable of changing the logical address map by altering a part of one of the first address signal and the second address signal.
摘要:
An IC chip is provided with a wireless unit for inputting and outputting data by wireless communication, in addition to a logic section, so that the IC chip no longer needs I/O pads, leaving only power supply and ground pads. IC chips can input and output data with one another by wireless communications, which makes it possible to significantly improve the spacing relationships of various chips on a singular or even plurality of substrates.