1. Seminar On Bicmos Technology
Submitted To: Submitted By:
Ghaytadak Satish Laxman

2. CONTENTS Introduction Abstract Characteristics of CMOS Technology
 Characteristics of Bipolar Technology
 Combine advantages in BiCMOS Technology
 BiCMOS Fabrication
BiCMOS Integrated Circuits
Advantages of BiCMOS
Disadvantages of BiCMOS
Applications of BiCMOS
Comparison between CMOS and BiCMOS
BiCMOS Products
Conclusion
Literature Survey

3. INTRODUCTION
The history of semiconductor devices started in 1930’s when Lienfed and Heil first proposed the mosfet.
Bipolar Technology was started in 1980’s.
CMOS Technology was also started in mid 1980’s.
Later in 1990 there was a cross over between bipolar and CMOS Technology.
In BiCMOS technology, both the MOS and bipolar device are fabricated on the same chip .

4. The objective of the BiCMOS is to combine bipolar and CMOS so as to exploit the advantages of both the technlogies.
Today BiCMOS has become one of the dominant technologies used for high speed, low power and highly functional VLSI circuits.
The process step required for both CMOS and bipolar are similar so the BiCMOS process has been enhanced and integrated into the CMOS process without any additional steps.

5. The primary approach to realize high performance BiCMOS devices is the addition of bipolar process steps to a baseline CMOS process.
The BiCMOS gates could be used as an effective way of speeding up the VLSI circuits.
The applications of BiCMOS are vast.
Advantages of bipolar and CMOS circuits can be retained in BiCMOS chips.
BiCMOS technology enables high performance integrated circuits IC’s but increases process complexity.

6. ABSTRACT
BiCMOS technology is a combination of Bipolar and CMOS technology.
CMOS technology offers less power dissipation, smaller noise margins, and higher packing density.
Bipolar technology, on the other hand, ensures high switching and I/O speed and good noise performance
Now we are in 3rd Generation BiCMOS Technology.

7. BiCMOS technology accomplishes both - improved speed over CMOS and lower power dissipation than bipolar technology.
The main drawback of BiCMOS technology is the higher costs due to the added process complexity.
This greater process complexity in BiCMOS results in a cost increase compared to conventional CMOS technology.

8. Characteristics of CMOS Technology
Lower static power dissipation
Higher noise margins
Higher packing density
High yield with large integrated complex functions
High input impedance (low drive current)
Scaleable threshold voltage
High delay load sensitivity
Low output drive current (issue when driving large capacitive loads)
Low transconductance, where transconductance, gm  Vin
Bi-directional capability (drain & source are interchangeable)
A near ideal switching device
Low gain

9. Characteristics of Bipolar Technology
Higher switching speed
Higher current drive per unit area, higher gain
Generally better noise performance and better high frequency characteristics
Improved I/O speed (particularly significant with the growing importance of package limitations in high speed systems).
high power dissipation
lower input impedance (high drive current)
low packing density
low delay sensitivity to load
High transconductance gm (gm  Vin)
It is essentially unidirectional.

10. Combine advantages in BiCMOS Technology
It follows that BiCMOS technology goes some way towards combining the virtues of both CMOS and Bipolar technologies
Improved speed over purely-CMOS technology
Lower power dissipation than purely-bipolar technology(Lower power consumption than bipolar)
Flexible I/Os for high performance
Improved current drive over CMOS
Improved packing density over bipolar
High input impedance
Low output impedance
High Gain and low noise

11. BiCMOS FABRICATION

12. BiCMOS Integrated Circuits

13. ADVANTAGES
Improved speed over CMOS
Improved current drive over CMOS
Improved packing density over bipolar
Lower power consumption than bipolar
High input impedance
Low output impedance
High Gain and low noise

14. DISADVANTAGES Increased manufacturing process complexity higher cost
Speed degradation due to scaling
longer fabrication cycle time
BiCMOS process
Bipolar process + Well + Gate Oxide & Poly + CMOS process

15. APPLICATIONS OF BICMOS
Full custom ICs
ALU’s, Barrel Shifters
SRAM, DRAM
Microproessor, Controller
Semi custom ICs
Register, Flipflop ,Standard cells
Adders, mixers, ADC, DAC
Gate arrays
Flash A/D Coverters

16. COMPARISON between BASIC CMOS & BiCMOS
1.Speed Comparison
3.Area Comparison
2.Delay Comparison

17. REFERENCES

18. Thanks