IC is a general designation of semiconductor component product, IC can divide by the function for: Etc IC of digital IC, imitate IC, microwave IC.

 

Digital IC is delivered namely, the treatment, IC that processes digital signal, it is to use the IC variety with the widest, the rapiddest development in recent years, can divide for current figure IC and special number IC.

 

Imitate IC is the IC of the natural imitate signal such as the light with successional processing, sound, speed, temperature, imitate IC is divided by application can divide for IC of IC of standard type imitate and special application imitate.

 

If press a technology to divide, imitate IC can divide what to handle imitate only IC mixes the linear of signal to process imitate and digital signal at the same time to mix IC.

 

IC of standard type imitate includes amplifier, voltage adjustment and reference are comparative, signal interface, data changeover, the product such as comparator; IC of special application imitate basically applies in periphery of communication, car, computer to mix consume 4 domains such as kind of electron.

 

Sum up the distinction of both simply: Digital circuit IC handles the parts of an apparatus of digital signal namely, for instance CPU, logistic circuit.

 

And imitate circuit IC is processing and the parts of an apparatus that provide imitate signal, for instance source of operation amplifier, linear manostat, fiducial voltage, they belong to imitate IC. The signal that imitate IC processes is had successional, can change study for sine wave, and the dispute that digital IC handles is successional signal, it is pulse square wave.

 

Different number parts of an apparatus has make Cheng differently, need different power supply voltage so, because this needs power supply more,manage technology of this one imitate. As the development of digital technology, imitate technology distributings at digital technology periphery, as inseparable as digital technology, digital technology and imitate technology are as follows quite:

 

 

Below the otherness that we show imitate IC and digital IC from the 4 big characteristics of imitate IC:

 

01, lifecycle can be as long as 10 years

What digital IC emphasizes is operation speed and cost are compared, the object that digital IC designs is to be in target operation rate is achieved below low cost as far as possible.

 

The architect must use more efficient algorithm to process digital signal ceaselessly, perhaps use new technology to rise compositive degree reduce cost. The lifecycle of digital IC is very accordingly short, it is 1 year about – 2 years.

 

What imitate IC emphasizes is to believe report of comparing of a confusion of voices, low lack fidelity, low cost, Gao Ke high to rely on gender and stability.

 

Once the product achieves design target to have long vitality, lifecycle is as long as 10 years the imitate IC product of above also is absent a few.

 

Be like NE5532 of frequency operation amplifier, go up oneself 70 time end rolls out the century up-to-date one of the most commonly used still frequency enlarge IC, almost the multimedia sound box of 50% used NE5532, its lifecycle exceeds 25 years.

 

Because lifecycle is long, so the price of imitate IC normally on the low side.

 

02, technology is special use CMOS technology less

Digital IC uses CMOS technology more, and imitate IC uses CMOS technology rarely.

 

Because imitate IC wants to output tall voltage normally,big perhaps electric current comes drive is other component, and the drive ability of CMOS craft is very poor.

 

In addition, imitate IC is the most crucial is low lack fidelity with Gao Xin a confusion of voices is compared, this both is accomplished more easily below tall voltage. And CMOS craft basically is used in the low voltage environment under 5V, and last develop toward low voltage direction.

 

Accordingly, imitate IC is inchoate use Bipolar craft, but Bipolar craft power comsumption is big, appear again accordingly BiCMOS craft, combined the advantage with Bipolar craft and CMOS both craft.

 

Still have CD technology additionally, be together CMOS craft and DMOS craft union. And BCD craft was to combine Bipolar, CMOS, DMOS3 to plant the advantage of craft.

 

There still are SiGe and GaAS technology in high frequency domain. These special technology need brilliant circle acting factory cooperate, also need an architect to try to be familiar with at the same time, and digital IC architect basically need not consider technology issue.

 

03, with yuan relationship of parts of an apparatus is close

The need that imitate IC needs to have good electric current to magnify because the technology is characteristic,the; such as character of character of characteristic, small electric current, frequency is in in the design inside area of whole and linear work, the symmetrical structure that often needs to consider overall arrangement of yuan of parts of an apparatus is mixed of parameter of yuan of parts of an apparatus each other match formal;

 

Imitate IC still must have low noise and low lack fidelity property. Resistor, capacitance, inductance can produce noise or lack fidelity, the architect must consider these yuan of influence of parts of an apparatus.

 

To digital circuit be mix without noise lack fidelity, digital circuit architect need not consider these factors completely.

 

In addition the limitation as a result of engineering technology, when imitate circuit is designed, answer to be used less as far as possible or need not resistor and capacitance, especially resistor of tall block value and high capacity capacitance, only such ability rise compositive spend and reduce cost.

 

IC of certain radio frequency is in the layout of circuit board also must consider inside, and place of digital IC design need not consider these. Accordingly the architect of imitate IC must be familiar with almost all electrons yuan parts of an apparatus.

 

04, cycle of auxiliary tool little test is long

Imitate IC architect needs comprehensive knowledge already, also need long of experience accumulate. Imitate IC architect needs to be familiar with workmanship of IC He Jingyuan and flow, need is familiar with much yuan the electric character of parts of an apparatus and physical character.

 

Normally very rare stylist is familiar with IC and the workmanship with round brilliant and flow. And in experience respect, imitate IC stylist needs at least 3 years – experience of 5 years, outstanding imitate IC stylist needs longer even experience 10 years.

 

The auxiliary tool that imitate IC designs is little, its are OK the EDA tool of have the aid of is far not as much as digital IC design. Because imitate IC power comsumption is big, the element of drag in is much, and imitate IC must maintain high stability again, because this attestation is periodic long. In addition, cycle of imitate IC test is long and complex.

 

Product of certain imitate IC needs to use special technology and enclose, must develop technology jointly with brilliant round factory, be like BCD craft and craft of 30V high pressure. In addition, some products need to use WCPS brilliant round class to enclose.