25-06-2012, 11:21 AM
SEMINAR ON CMOS SUPERBUFFERS & Bi-CMOS GATES
[attachment=25365]
CMOS SUPERBUFFER
Wide channel CMOS inverter
or
Pair of inverter.
Can supply or remove large currents.
CMOS superbuffer should have the capability of tristating the pad driver also.
Bi-CMOS Gates?
As the name indicates its nothing but
BJT + CMOS Bi-CMOS Gates ( Bi-CMOS Circuits).
Applications of BJT.
amplifying, switching.
Why only npn BJT in Bi-CMOS ?
Current carried by electrons having higher mobility allowing greater currents and faster operations.
BJT provide current divide and low output impedance.
MOS devices provide high input impedance.
Uses of Bi-CMOS gates
Improve the performance of line drivers and sense amplifiers.
Low power dissipation of CMOS with O/P drive capability and low propagation delay of bipolar technology.
Bipolar devices helps to Interface with the current mode or emitter coupled logic(ECL) , for high speed.
CONCLUSION
The circuit dissipates essentially, no stand by power and low power consumption of the CMOS circuit is preserved.
So the design aim is achieved.
[attachment=25365]
CMOS SUPERBUFFER
Wide channel CMOS inverter
or
Pair of inverter.
Can supply or remove large currents.
CMOS superbuffer should have the capability of tristating the pad driver also.
Bi-CMOS Gates?
As the name indicates its nothing but
BJT + CMOS Bi-CMOS Gates ( Bi-CMOS Circuits).
Applications of BJT.
amplifying, switching.
Why only npn BJT in Bi-CMOS ?
Current carried by electrons having higher mobility allowing greater currents and faster operations.
BJT provide current divide and low output impedance.
MOS devices provide high input impedance.
Uses of Bi-CMOS gates
Improve the performance of line drivers and sense amplifiers.
Low power dissipation of CMOS with O/P drive capability and low propagation delay of bipolar technology.
Bipolar devices helps to Interface with the current mode or emitter coupled logic(ECL) , for high speed.
CONCLUSION
The circuit dissipates essentially, no stand by power and low power consumption of the CMOS circuit is preserved.
So the design aim is achieved.