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1 BICMOS TECHNOLOGY

2 TALK FLOW What is VLSI What is BiCMOS FEATURES
CHARACTERSTICS OF CMOS, BIPOLAR and BICMOS TECHNOLOGY BiCMOS fabrication process CMOS inverter BiCMOS inverter Comparison between CMOS and BiCMOS Pros and Cons Applications Conclusion

3 What is VLSI ? VLSI stands for very large scale integration and is the process of creating integrating circuits by combining thousands of transistors into a single chip. Invention of VLSI is based on the achievements in the field of semiconductor technology. Transistors were invented at Bell labs in Jack kilby at texas instruments in 1958 was first to make a integrated circit ready. It elimnates the use of discrete components, wires and manual assembly of components. Eg. Microprocessor,controllers etc.

4 WHAT IS BiCMOS BiCMOS Bipolar compatible CMOS(BiCMOS) technology:
Introduced in early 1980s Combines Bipolar and CMOS logic CMOS BIPOLAR Low power dissipation High speed High packing density High output drive BiCMOS

5 Features: 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 almost similar 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 Characterstics 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 It is essentially unidirectional.

7 Charactestics of CMOS 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) Bi-directional capability (drain & source are interchangeable) A near ideal switching device Low gain

8 Characterstics of 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

9 BiCMOS FABRICATION PROCESS
CMOS process BIPOLAR process 1 . N well 1. n collector 2. P base doping(extra step) 3. PMOS source and drain 3. p+ base contact 4. NMOS source and drain 4. n+ emitter Adapted from A.R.Alvarage et al.,”An overview of BiCMOS Technology and Applications”,IEEE International Symposium on Circuits and Systems,1-3 May,1990

10 BiCMOS CROSS-SECTION Adapted from J. M Rabaey, Digital Integrated Circuits: A Design Prespective, NewJersey: Prentice-Hall, Inc., 1996.

11 BiCMOS process flow steps:

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18 CMOS INVERTER CIRCUIT DIAGRAM VDD IP OP GND
Adapted from www2.eng.cam.ac.uk/~dmh/3b2/invert.htm

19 BASIC BiCMOS INVERTER Adapted from J. M Rabaey, Digital Integrated Circuits: A Design Prespective,New Jersey: Prentice-Hall, Inc., 1996.

20 CONVENTIONAL BiCMOS INVERTER
Adapted from J. M Rabaey, Digital Integrated Circuits: A Design Prespective,New Jersey: Prentice-Hall, Inc., 1996.

21 PULL UP EVENT C load Adapted from Sung-Mo Kang,Yusuf Leblebici,”CMOS Digital Integrated Circuits:Analysis and Design”,Tata McGraw-Hill,Third edition,2003,p.547.

22 PULL DOWN EVENT C load Adapted from Sung-Mo Kang,Yusuf Leblebici,”CMOS Digital Integrated Circuits:Analysis and Design”,Tata McGraw-Hill,Third edition,2003,p.550.

23 BiCMOS VS. CMOS VTC comparison CMOS BiCMOS
Nfbdf,fmnsdvnv,sndkmvnmdnvn,fnv BiCMOS Adapted from www2.eng.cam.ac.uk/~dmh/3b2/invert.htm

24 SPEED COMPARISON Adapted from Larry Wissel and Elliot L. Gould,”Optimal Usage of CMOS within a BiCMOS Technology”,IEEE J. of solid-state circuits, Vol. 27, No. 3, March1992

25 DELAY COMPARISON scaling of the technological parameters leads to the scaling of the device parameters Adapted from Larry Wissel and Elliot L. Gould,”Optimal Usage of CMOS within a BiCMOS Technology”,IEEE J. of solid-state circuits, Vol. 27, No. 3, March 1992

26 AREA COMPARISON A AREA C COMPLEXITY
Adapted from H.Klose et al.,”Bicmos,a tehnology for High speed/High density ICs”,IEEE international conference on Computer Design:VLSI in computers and proessors,2-4 Oct.,1989

27 PROS OF BiCMOS Improved speed over CMOS
Improved current drive over CMOS Improved packing density over bipolar Lower power consumption than bipolar High input impedance Latchup immunity

28 CONS OF BiCMOS Increased manufacturing process complexity
Speed degradation due to scaling The efficiency of BiCMOS device increased by 2 and cost increased by 1.3 to 1.5 as compared to CMOS. Adapted from Paul G. Y. Tsui et al.,”Study of BiCMOS Logic Gate Configurations for Improved Low-Voltage Performance”, IEEE J. of solid-state circuits, Vol. 28, No 3. March 1993.

29 APPLICATIONS Full custom ICs Semi custom ICs Standard cells
SRAM,DRAM Microproessor,controller Semi custom ICs Register,Flipflop Standard cells Adders,mixers,ADC,DAC Gate arrays

30 BiCMOS PRODUCTS W-CDMA DCR GSM 900 POWER AMPLIFIER
SiGe BiCMOS GPS CIRCUIT W-CDMA DCR

31 CONCLUSION The extra process complexity requires chip manufacturers to command a premium for BiCMOS products. In the analog market the ability to integrate large mixed systems provides the compelling cost advantage of BiCMOS; this market is still emerging. BiCMOS is a complement to pure CMOS and Bipolar technologies in important system application areas. One of the main challenges facing BiCMOS design is to maintain its performance gain at lower voltage levels.

32 REFERENCES [1]Kiat-Seng Yeo et al.,”CMOS/BiCMOS ULSI:Low voltage,Low power”,Pearson Education,Inc., First edition,2002. [2]Sung-Mo Kang,Yusuf Leblebici,”CMOS Digital Integrated Circuits:Analysis and Design”,Tata McGraw-Hill,Third edition,2003. [3]E.A.Gonzalez,”BiCMOS processes,trends and applications”,DLSU ECE,Technical report,Nov.29,2004. [4]A.R.Alvarez et al.,”An overview of BiCMOS technology and applications”,IEEE International Symposium on Circuits and Systems,1-3 May,1990. [5] T. Sakurai, “A review on low-voltage BiCMOS circuits and a BiCMOS vs. CMOS speed comparison,” Proceedings of the 35th Midwest Symposium on Circuits and Systems, vol. 1, Aug [6] J. M Rabaey, Digital Integrated Circuits: A Design Prespective, NewJersey: Prentice-Hall, Inc., 1996. [7] J. P. Uremuya, Circuit Design for CMOS VLSI, Massachusetts: Kluwer Academic Publishers, 1992. [8] Adapted from H.Klose et al.,”Bicmos,a tehnology for High speed/High density ICs”,IEEE international conference on Computer Design:VLSI in computers and proessors,2-4 Oct.,1989 [9] Larry Wissel and Elliot L. Gould,”Optimal Usage of CMOS within a BiCMOS Technology”,IEEE J. of solid-state circuits, Vol. 27, No. 3, March 1992 [10] Paul G. Y. Tsui et al.,”Study of BiCMOS Logic Gate Configurations for Improved Low-Voltage Performance”, IEEE J. of solid-state circuits, Vol. 28, No 3. March 1993. [11] D.L.Harame,”Current Status and Future Trends of SiGe BiCMOS Technology” IEEE transactions on electron devices, vol. 48, no. 11, november 2001 [12]Adapted from D.Harame et al.,”The Emerging Role of SiGe BiCMOS Technology in Wired and Wireless Communications”, Fourth IEEE International Caracas Conference on Devices, Circuits and Systems, Aruba, April 17-19, 2002.

33 THANK YOU Q U E R I E S ?


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