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78 results about "Special care" patented technology

High value split poly P-resistor with low standard deviation

A resistor structure is disclosed that is constructed out of two layers of polysilicon. The intrinsic device is made using the top layer which is either a dedicated deposition, or formed as part of an existing process step such as a base epi growth in a BiCMOS flow. This poly layer can be made with a relatively high (greater than 2000 ohms per square) sheet resistance by appropriate scaling of the implant dose or by insitu doping methods. In this invention this layer is arranged to be about 1000 A or less thick. Such a resistor form with this thickness has been shown to demonstrate a better standard deviation of resistance compared to resistors made with a thicker layer. Additionally, practical resistors made in elongated forms demonstrate better standard deviations of resistance when five bends were incorporated into the form. The resistor ends are formed by the addition of a bottom poly layer in a self aligned manner with a deposition that may already be part of the process sequence. The end result is that the intrinsic resistor body is formed of a single poly layer, while the ends are created out of two layers. These ends are thick enough so that standard silicide and contact etch processing may be added to the structure without special care. In addition, dedicated or already available implants may be incorporated into the resistor ends to ensure ohmic contacts from polysilicon to the silicide or the contact metal are achieved. These steps can produce an easily fabricated resistor structure with consistent, low resistance, ohmic end contacts, and intrinsic resistance of greater than 2000 ohms per square.
Owner:SEMICON COMPONENTS IND LLC

Preparation method of detachable plant three-dimensional specimen

The invention provides a preparation method of a detachable plant three-dimensional specimen, relates to a preparation method of three-dimensional specimens, and solves the problems that traditional plant three-dimensional specimens are incapable of being detached and inconvenient to move and carry, regular care is also needed, and much time is consumed. The preparation method includes: first, dust is removed from plants to be manufactured, and each part of the plant to be processed is cut out; second, corresponding moulds are made according to morphological characteristics of each part of the plant to be processed, each part of the plant to be processed is fixed in the corresponding mould in sequence, so that well fixed plant three-dimensional specimen is achieved; third, colophony is heated to be melted and is covered on the well fixed plant three-dimensional specimen, and the well fixed plant three-dimensional specimen is naturally cooled to the indoor temperature, the plant three-dimensional specimen gets into the shape, so that the preparation is finished. The preparation method can achieve the purposes of detaching and assembling of each part of a plant, so that the detachable plant three-dimensional specimen is convenient to carry and move, capable of preserving the plant for a long time, and no special care and maintenance are needed, and therefore the detachable plant three-dimensional specimen is time-saving and durable.
Owner:EAST UNIV OF HEILONGJIANG

High value split poly p-resistor with low standard deviation

A resistor structure is disclosed that is constructed out of two layers of polysilicon. The intrinsic device is made using the top layer which is either a dedicated deposition, or formed as part of an existing process step such as a base epi growth in a BiCMOS flow. This poly layer can be made with a relatively high (greater than 2000 ohms per square) sheet resistance by appropriate scaling of the implant dose or by insitu doping methods. In this invention this layer is arranged to be about 1000 A or less thick. Such a resistor form with this thickness has been shown to demonstrate a better standard; deviation of resistance compared to resistors made with a thicker layer. Additionally, practical resistors made in elongated forms demonstrate better standard deviations of resistance when five bends were incorporated into the form. The resistor ends are formed by the addition of a bottom poly layer in a self aligned manner with a deposition that may already be part of the process sequence. The end result is that the intrinsic resistor body is formed of a single poly layer, while the ends are created out of two layers. These ends are thick enough so that standard silicide and contact etch processing may be added to the structure without special care. In addition, dedicated or already available implants may be incorporated into the resistor ends to ensure ohmic contacts from polysilicon to the silicide or the contact metal are achieved. These steps can produce an easily fabricated resistor structure with consistent, low resistance, ohmic end contacts, and intrinsic resistance of greater than 2000 ohms per square.
Owner:SEMICON COMPONENTS IND LLC

Preparation method of weakly-acidic cation chromatography column packing

The invention discloses a preparation method of a weakly-acidic cation chromatography column packing. The preparation method comprises the following steps: adding a functional monomer, a crosslinkingagent and an initiator into an organic solvent, performing stirring to achieve complete dissolving, adding a completely-swollen polystyrene-divinylbenzene microspheres, performing ultrasonic treatmentor heating to volatilize the solvent, raising the temperature to 120-200 DEG C after the surfaces of the microspheres are slightly dry and solidified, and carrying out a dry graft polymerization reaction at a constant temperature of the 120-200 DEG C to obtain a weakly-acidic cation chromatography column packing resin; and hydrolyzing the prepared packing resin by an acid or an alkali to obtain the weakly-acidic cation chromatography column packing. The preparation method has the advantages of simplicity, easiness in operation, realization under routine production conditions, a routine pressure and a constant and high temperature (120-200 DEG C), no special care, and completion after a period of treatment. A weakly-acidic cation chromatography column made from the packing has the advantages of high detection response value, low detection limit, increased resolution, increased column efficiency and shortened retention time.
Owner:QINGDAO PUREN INSTR
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