Introduction Historically, technology been domain digital designer. An
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Silicon Gate CMOS Linear Technology
Introduction Historically, technology been domain digital designer. Analog designers might transistors input stage high input impedance operational amplifier discrete transistors linear circuit, bipolar technology ruled linear integrated circuit world. CMOS technology changed this. incredible growth CMOS market caused rapid development CMOS technology which advanced CMOS linear devices. There number factors that will cause CMOS linear market continue grow rapidly become very important part linear technology. proliferation digital circuitry (digital displays, digital computers, etc.) analog applications, large increase chip density, demands smaller integrated circuits, rapid increase demand accurate, power devices will lead tremendous number CMOS linear applications. This article discusses silicon gate CMOS technology advantages disadvantages CMOS devices order design engineer fully understand role products play linear design. Technology Since most linear design accomplished with bipolar junction transistors, examination CMOS Bipolar Junction Technology (BJT) merits each will best explain advantages each technology. Then, comparison metal silicon gate CMOS technology will further identify silicon gate CMOS transistors' unique role. CMOS technology "simpler" than technology that BJT's three dimensional parameters like base depth, base thickness base collector doping need considered. Since three-dimensional bipolar parameters more difficult control, CMOS technology leads better controlled process with less variation crucial device parameters. addition, recent advances processing techniques equipment more applicable CMOS ICs. This means likely CMOS technology will advance more quickly than technology. Finally, number chips required function chip count device goes down, need monolithic analog digital circuitry will increase. CMOS linear devices same fabrication process CMOS digital devices which makes integration analog digital devices simple. Bipolar junction transistor technology needs combine with CMOS technology which makes fabrication cumbersome, complex expensive. There also differentiation within CMOS world well differentiation between CMOS technology. major difference between transistors with metal gate transistors with polysilicon gate. silicon gate devices derive their advantages from processing. When making metal gate CMOS transistor, mask used toward processing allow proper placement size metal gate. When polysilicon gate used, polysilicon deposited before gate defined. source drain regions then doped while keeping channel doping different type. This known self-aligned gate, with which devices made smaller fabricated with precision. This results smaller, faster chips with smaller, more stable voltage current offsets.
Advanced Linear Devices
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Advantages major advantages silicon gate CMOS compared metal gate linear their higher speed lower power consumption. These features impact broad range device performance parameters. faster chip widens scope possible applications increases signal quality reliability. given frequency response, power reduced. CMOS respond higher frequency inputs, timers oscillate higher frequencies, response times operational amplifiers comparators reduced while slew rate operating frequency increase. these qualities give wider signal frequency range operating design margin providing increased accuracy gain bandwidth reduced voltages power requirement over broad operating conditions. power consumptions CMOS linear chips advantageous number different ways. Many devices operate supply voltages with ultra leakage current which facilitates battery operation. This only means less power consumption, operational amplifiers comparators results lower offset voltage caused thermal drift timers results higher accuracy stability. This lessens dependence timing accuracy expensive components, increasing accuracy reducing cost timing function. addition, number transistors chip increases, power consumption CMOS allow greater densities will require little external cooling very little self-heating design considerations. Another advantage silicon gate CMOS linear technology discussed here compatibility with CMOS digital technology. availability relative ease with which digital functions such logic gates, flipflops, counters memory cells added analog library means that complete systems, including large amount digital logic, analog modules, passive components such resistors capacitors, integrated into ASIC chip. This capability referred mixed mode (analog digital) integration where most components electronic system implemented single monolithic chip. Generally, given system only other types components such transducers, sensors, inductors, precision resistors, large capacitors, relays, etc. left chip. final advantage CMOS linear technology high circuit function density cost. CMOS linear technology VLSI (very large scale integration) technology, many circuit function blocks integrated onto same monolithic chip, only producing compactness, system miniaturization, also producing function cost high function reliability. Furthermore, integration large number elements, board area cost, labor cost inventory management costs greatly reduced. Disadvantages spite many technological advantages, there some disadvantages associated with CMOS linear devices. Although important applications, CMOS devices often lack current drive capability BJT's. Noise also drawback CMOS linear ICs. CMOS advantage level shot noise, noise larger. final disadvantage speed performance ultra precision certain applications.
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Advanced Linear Devices
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