Technical Seminar on Bi-cmos Technology. In BiCMOS technology, both the MOS and bipolar device are fabricated on the same chip. CONTENTS Introduction Abstract Characteristics of CMOS Technology Characteristics of Bipolar Technology Combine advantages in BiCMOS Technology. Explore BiCMOS Technology with Free Download of Seminar Report and PPT in PDF and DOC Format. Also Explore the Seminar Topics.

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The impedances Z 1 and Z 2 are necessary to remove the base charge of the bipolar transistors when they are being turned off.

Before a high-performance analog system can be integrated on a digital chip, the analog circuit blocks must have available critical passive components, such as resistors and capacitors. Adding these resistors not only reduces the transition times, but also has a positive effect on the power consumption.

The high power consumption makes very large scale integration difficult. However, this is achieved at a price. For instance, during a high-to-low transition on the input, M 1 turns off first. Both use a bipolar push-pull output stage. Download your Full Reports for Bicmos Technology Complementary MOS offers an inverter with near-perfect characteristics such as high, symmetrical noise margins, high input and low output impedance, high gain in the transition region, high packing density, and low power dissipation.

This happens through Z 1. The resulting current spike can be large and has a detrimental effect on both the power consumption and the supply noise.

There exists a short period during the transition when both Q 1 and Q 2 are on simultaneously, thus creating a temporary current path between VDD and GND. Download your Full Reports for Bicmos Technology. To turn off Q 1, its base charge has to be removed. These steps create linear capacitors with low levels of parasitic capacitance coupling to other parts of the IC, such as the substrate. Complementary MOS offers an inverter with near-perfect characteristics such as high, symmetrical noise margins, high input and low output impedance, high gain in the transition region, high packing density, and low power dissipation.

BiCMOS Process Technology

Speed is the only restricting factor, especially when large capacitors must be driven. We first discuss the gate in general and then provide a more detailed discussion of the steady-state and transient characteristics, and the power consumption. Smeinar similar fanouts and a comparable technology, the propagation delay is about two to five times smaller than for the CMOS gate. The same is also true for VOL. Its resistivity is chosen so that it can support both devices.


Examples of analog or mixed-signal SOC devices include analog modems; broadband wired digital communication chips, such as DSL and cable modems; Wireless telephone chips that combine voice band codes with base band modulation and demodulation function; and ICs that function as the complete read channel for disc drives.

Latest Seminar Topics for Engineering Students. The output voltage of VDD? Technoloy recent years, improved technology has made it possible to combine complimentary MOS transistors and bipolar devices in a single process at a reasonable cost.

BICMOS Technology

Though additional process steps may be needed for the resistors, it may be possible to alternatively use the diffusions steps, such as the N and P implants that make aeminar the drains and sources of the MOS devices.

However it took 30 years before this idea was applied to functioning devices to be used in practical applications, and up to the late this trend took a turn when MOS technology caught up and there was a cross over between bipolar and MOS share.

The result is a low technoloyg voltage.

Noise issues from digital electronics can also limit the practicality of forming an SOC with high-precision analog or RF circuits. Then mail to us immediately to get the full report. First of all, the logic swing of the circuit is smaller than the supply voltage. Sincethe state-of-the-art bipolar CMOS structures have been converging. The following properties of the voltage-transfer characteristic can be derived by inspection. Digital processors also allow tuning of analog blocks, such as centering filter-cutoff frequencies.

Added process steps may be required to achieve characteristics for resistors and capacitors suitable for high-performance analog circuits. Most of the techniques used in this section are similar to those used for CMOS and ECL gates, so we will keep the analysis short and leave the detailed derivations as an exercise.


Q 2 acts as an emitter-follower, so that Vout rises to VDD? Various schemes have been proposed to get around this problem, resulting in gates with logic swings equal to the supply voltage at the expense of increased complexity.

The concept of system-on-chip Semunar has evolved as the number of gates available to hechnology designer has increased and as CMOS technology has migrated from a minimum feature size of several microns to close to 0. The shortcomings of these elements as resistors, beyond their high parasitic capacitances, are the resistors, beyond their high parasitic capacitances, are the resistor’s high temperature and voltage coefficients and the limited control of the absolute value of the resistor.

Analog or mixed-signal SOC integration is inappropriate for designs that will allow low production volume and low technopogy. In this case, the nonrecurring engineering costs of designing the SOC chip and its mask set will far exceed the design cost for a system with standard programmable digital parts, standard analog and RF functional blocks, and discrete components.

A system weminar requires power-supply voltages greater than 3. A low Vinon the other hand, causes M 2 and Q 2 to turn on, while M 1 and Q 1 are in the offstate, resulting in a high output level.

BICMOS Technology – Mobikida

This, tecbnology turn, reduces system size and cost and improves reliability by requiring fewer components to be mounted on a PC board.

Discussing one is sufficient to illustrate the basic concept and properties of the gate. Are you interested in any one of this Seminar, Project Topics. A technplogy ECL circuit, for instance, consumes 60 W for a signal swing of 0.

Many of these systems take advantage of the digital processors in an SOC chip to auto-calibrate the analog section of the chip, including canceling de offsets and reducing linearity errors within data converters.