subject: Comparison Of Analog Ic And Digital Ic - Analog Ic, Digital Ic-electronics Industry [print this page] Handle continuous light, sound, speed, temperature and other natural analog signal IC Known as the analog IC. Analog IC processing these signals have continuity, can be converted to sine wave research. The continuity of non-digital signal processing IC, is a square wave pulse.
Analog IC technology type to be divided by only a linear analog signal processing IC and analog and digital signals simultaneously mixed IC. Analog IC can be divided by application to sub-standard and application-specific analog IC Analog IC. Standard analog IC including amplifier (Amplifier), voltage regulator and reference contrast (VoltageRegulator / Reference), the signal interface (Interface), data conversion (DataConversion), comparator (Comparator) and other products. Application Specific Analog IC used in four main areas, namely telecommunications, automobiles, computer peripherals and consumer electronics.
Analog IC has four characteristics: A, the life cycle can be as long as 10 years. Digital IC emphasize speed and cost ratio computing, digital IC design goal is to achieve the lowest possible cost goals under the operating speed. Designers must continue to use more efficient algorithms to process digital signals, or the use of the new process to improve the integration cost. Therefore, the life cycle of digital IC is very short, about 1 year -2 years.
Analog IC to stress that the high signal to noise ratio, low distortion, low power consumption, high reliability and stability. Once the products meet the design goals with lasting vitality, the life cycle of more than 10 years of analog IC products are not unusual. Such as audio op amp NE5532, since the late introduction of the 70 most commonly used until now is one of the audio amplification IC, almost 50% of the multimedia speakers are used NE5532, more than 25 years of its life cycle. Because the long life cycle, so the price of analog IC is usually low.
B, less special CMOS process technology
CMOS digital IC to use more technology, but rarely used in CMOS analog IC technology. Because the analog IC usually high voltage or high current output to drive other components, and poor driving capability CMOS process. In addition, the most critical analog IC is a low-distortion and high signal to noise ratio, both of which are in the high-voltage relatively easy. The CMOS technology is mainly used in low voltage below 5V environment, and continued in a low-voltage direction.
Therefore, early use of Bipolar analog IC technology, but power consumption Bipolar technology, it has emerged BiCMOS process that combines Bipolar CMOS process technology and the advantages of both. There are also CD technology, the CMOS and DMOS process technology together. The BCD process is a combination of Bipolar, CMOS, DMOS are three advantages of this method. There are high-frequency field and GaAS SiGe technology. These special technology needs of foundry with, but also need to be familiar with the designers, and digital IC designers do not consider the process is basically the problem.
C, close relationship with the components
Analog IC in the whole area of work requires a good linear current amplification characteristics, low current characteristics, frequency characteristics; in the design of the need for technical characteristics, components often need to consider the symmetrical layout of the structure and component parameters match each other form; analog IC also must have low noise and low distortion performance. Resistance, Capacitance Inductor will produce noise or distortion, the designer must take into account the impact of these components.
For digital circuits is no noise and distortion, digital circuit designers do not fully take into account these factors. Furthermore, since the technology's limitations, analog circuit design should be minimal, with or without resistors and capacitors, especially high-resistance resistor and large capacitor, the only way to improve integration and reduce costs.
