Circuitry
With the circuitry (かいろせっけい), design the circuit.
Table of contents
General statement
Macrotaxonomy of the circuitries may include an analog circuitry, a digital circuitry.
In an analog circuit, as for the design of the circuit for the low frequency and the design of the high frequency circuit, there are many different points. Unique technique, knowledge is required in a high frequency circuitry, and the specialists of the high frequency circuit go generally.
There are the designs such as an IC, LSI, the VLSI in the present age when high integration advanced, too. There are analog IC and a digital IC to an IC even if I say "the circuitry of the IC", and design technique is different from an analog circuit in a word by the digital circuit [1], and a CAD tool is different [1].
In late years ASIC, FPGA exist, too, and the circuitry including them is performed, too.
Design of the digital integrated circuit
Can classify the flows of the design of the digital IC as follows; is turned on.
- Systems architecture → function design → logic design → circuitry → layout design [1]
The systems architecture is carried out while considering constitution of the whole IC, circuit specifications, a use, the function that you should prepare for.
By the function design, I decide circuit movement of the whole IC based on the content that I established by systems architecture. In late years the automation of the function design of the digital circuit advanced and became able to program circuit movement and a function by a hardware description language (HDL).
By the logic design, I convert a description of the HDL mentioned above into a level of the logic gate. I perform it with an automatic tool for the conversion, and, after logic composition, logic optimization, mapping processing, the figure (logic diagram) indicating connection relations of the logic gate will be generated [2].
While a theory analyzes a transistor, resistance, capacity in the circuitry here, it is decided and performs the characteristic analysis of the design circuit.
By the layout design, I place a basic cell on the tip and wire it.
Design of the analog integrated circuit
The flow of the design of the analog IC may be explained as follows.
- Circuitry → function design → layout design → design rule check → circuit parameter extraction → layout, circuit comparison → parasitic element extraction → post-layout simulation
Because there is not a CAD tool for the placement wiring by the layout design of the analog IC, unlike a digital IC, I am considered to be [3] to perform input してを at a transistor, resistance, a shape and dimensions of the capacity by hand.
I confirm whether a design rule is followed by the design rule check (DRC). Dracula of cadence company is known as a CAD tool to perform a design rule check [3].
In the circuit parameter extraction from layout design data for SPICE extract a strike thickly, and is formed.
By a layout, the circuit comparison, I compare the connection diagram in the circuitry with the list of nets mentioned above. If two are the same, it is good and, in the case of defectiveness, I lay it out again and design it again.
Embedded system
The circuitry in the embedded system is located in the whole system development for the following stages.
- Choice → circuitry → logic simulation → prototype making → inspection of the determination of hardware specifications → a lot of device and correction [4] of the circuit
Most are considered to be [5] performed using a CAD system, and the work of the current circuitry locates the symbol of the device which is for the work and is to connect symbols [5]. Automatic wiring, a function of the automatic simulation are provided by a CAD system, and the hierarchy design is enabled, too [5]. If a hierarchy design is to manage the connection diagram hierarchically and begins with rough constitution and subdivides it progressively and finally designs the details circuit, I can constitute all circuits [5].
The source, footnote
- ^ a b c Satoshi Eguchi "design and fabrication and reliability technique p.37 of the MOS integrated circuit"
- ^ Satoshi Eguchi "design and fabrication and reliability technique p.38 of the MOS integrated circuit"
- ^ a b Satoshi Eguchi "design and fabrication and reliability technique p.40 of the MOS integrated circuit"
- ^ 藤弘哲也 if "it is basic structure p.89 of the embedded system to understand well"
- ^ a b c d 藤弘哲也 if "it is basic structure p.93 of the embedded system to understand well"
Allied item
This article is taken from the Japanese Wikipedia Circuitry
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