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Difference between revisions of "bicmos"

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===BiNMOS===
 
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Revision as of 17:21, 17 November 2015

BiCMOS (Bipolar-CMOS) is a technique for constructing analog and digital logic circuits from both CMOS and Bipolar semiconductor technologies.

Overview

Bipolar transistors have a higher current output per unit input capacitance. CMOS on the other hand is low-power, has wide noise margin and high nput impedance. BiCMOS makes use of those excellent current drive characteristics to build buffers that can quickly drive large fanouts. It attempts to provide improved speed over CMOS and lower power dissipation than bipolar by combining both technologies on a single die. BiCMOS fabrication therefore ends up being considerably more expensive due to the increase mask count.

Inverter Example

Main article: inverter#BiCMOS

A simple BiCMOS inverter can be constructed from a pair of MOS transistor and NPN transistors. Each of the MOS transitors are cascaded with an NPN transistor. When the input is HIGH, the NMOS transitor is conducting becoming the base current for the Q2 NPN transistor causing the discharge current to drop. Conversely when the input is LOW, the PMOS transistor is conducting becoming the base current for the Q1 NPN transistor, causing the output the increase.

Logic Families/Types

Various types of BiCMOS gates were devised over time to overcome different issues, some of the common ones are listed below:

Conventional BiCMOS

Main article: Conventional BiCMOS
New text document.svg This section is empty; you can help add the missing info by editing this page.

R-Type

Main article: R-Type BiCMOS
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R+N-Type

Main article: R+N-Type BiCMOS
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FS-Type

Main article: FS-Type BiCMOS
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FB-Type

Main article: FB-Type BiCMOS
New text document.svg This section is empty; you can help add the missing info by editing this page.

BiNMOS

Main article: BiNMOS
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BiPNMos

Main article: BiPNMos
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CBiCMOS

Main article: CBiCMOS
New text document.svg This section is empty; you can help add the missing info by editing this page.

MBiCMOS

Main article: MBiCMOS
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See also


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