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Experience with SiGe Technology

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eng_islam

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sige technology

i am asking about is working on SiGe tech. differ than Si only process and what is the considration i have take when i m working on tech. like .25µ SiGe
thanx
 

Re: SiGe Technology

SiGe is a BiCMOS technology. So, you have the option to use bipolar transistors ( vertical bipolar transistors ). Usually, these BJT's have a much higher fT ( maybe an order of magnitude higher )than the CMOS transistors so they can be used for higher frequencies.

I don't think there is a special consideration. You just have the option to use very high speed Bipolars besides the normal MOS transistors.

Just take care of the limitations of BJT's, namely: base current, larger areas, limited swing, and relatively high Vbe ( may reach 0.8 - 0.9 Volts which may cause headroom limitations ).


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    eng_islam

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Re: SiGe Technology

i think for the mos transistor will have higher kp and kn which is better
 

    E

    eng_islam

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SiGe Technology

Advantages of SiGe are Higher fT, Lesser noise, greater breakdown voltage (useful for PA). Drawbacks are cost of fabrication, higher supply voltage--> more power consumption, "lesser integrability" (digital and analog circuits in same IC) etc. So SiGe used for applications >10-15GHz where Si CMOS cant go..

Regards
Maddy
 

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