Why does integrated injection logic has a higher density?

Why does integrated injection logic has a higher density?

In the integrated injection logic family, p-n-p and n-p-n transistors are integrated. Due to this transistors will occupy less space. Hence, the density is more than any other logic family. The integrated injection logic has a higher density of integration than TTL because it uses a bipolar transistor.

What do you understand by the term logic family?

A logic family of monolithic digital integrated circuit devices is a group of electronic logic gates constructed using one of several different designs, usually with compatible logic levels and power supply characteristics within a family. Some such logic families use static techniques to minimize design complexity.

What are different families of digital integrated circuits?

These families are listed below:

• Diode Logic (DL)
• Resistor-Transistor Logic (RTL)
• Diode-Transistor Logic (DTL)
• Transistor-Transistor Logic (TTL)
• Emitter Coupled Logic (ECL)
• Complementary Metal Oxide Semiconductor Logic (CMOS)

What are the requirements of a logic family?

The characteristics which are bound to be identical and used to compare performance are:

• Supply voltage range.
• Speed of response.
• Dissipation of power.
• Input and output logic levels.
• Current sinking capability.
• Current sourcing capability.
• Flexibility.
• Noise immunity.

Which gate is current hogging problem?

Gate fan-out is limited due to “current hogging”: if the transistor base-emitter voltages (VBE) are not well matched, then the base-emitter junction of one transistor may conduct most of the input drive current at such a low base-emitter voltage that other input transistors fail to turn on.

What is the significance of logic family with reference to digital integrated circuits?

Significance of Logic Families When we talk about digital systems actually the digital ICs are the ones which make up the whole system. And if all the ICs are of same logic family then they are compatible to each other and the intended logic functions are performed and the goal is achieved.

What is the significance of the logic family with reference to digital integrated circuits ICs )?

While producing digital ICs, different circuit configurations and manufacturing technologies are used. This results into a specific logic family. Each logic family designed in this way has identical electrical characteristics such as supply voltage range, speed of operation, power dissipation, noise margin etc.

What is current hogging problem?

A condition in which the largest fraction of a current passes through one of several parallel logic circuits because it has a lower resistance than the others. It is an undesirable condition and can result in damage to the transistor.

How is the integrated injection logic operation explained?

Integrated Injection Logic Operation is explained as follows. To understand the working of a typical I2L gate, consider Fig. 3.46, which consists of five transistors, connected as shown. It can be seen that the base current IB1 of T1 is derived from +VCC through the input terminal B.

Why does integrated injection logic have high noise immunity?

Although the logic voltage levels are very close (High: 0.7V, Low: 0.2V), I2L has high noise immunity because it operates by current instead of voltage. I2L was developed in 1971 by Siegfried K. Wiedmann and Horst H. Berger who originally called it merged-transistor logic (MTL).

What kind of transistors are used in integrated injection logic?

Integrated-injection logic family (I2L) is a technology that makes use of only PNP and NPN bipolar junction transistors; use of resistors, capacitors, and inductors are completely avoided in this technology. Also, no isolation is required between individual transistors.

Which is better integrated injection logic or CMOS?

When introduced it had speed comparable to TTL yet was almost as low power as CMOS, making it ideal for use in VLSI (and larger) integrated circuits. The gates can be made smaller with this logic family than with CMOS because complimentary transistors are not needed.