What is PullUp and PullDown network?

What is PullUp and PullDown network?

Pull up Network is used to make output as logic High. Pull down network is used to make output as Logic Low. (2) Pull up network is made up of PMOS Transistors because of property of passing strong ‘1’ Pull down network is made up of NMOS Transistors because of property of passing strong ‘0’

What is the benefit and role of pull up and pull down resistors in CMOS and in the input and output pins?

A pull-up resistor allow controlled current flow from supply voltage source to the digital input pins, where the pull-down resistors could effectively control current flow from digital pins to the ground. At the same time both resistors, pull-down and pull-up resistors hold the digital state either Low or High.

What is lambda in CMOS technology?

CMOS ‘λ’ Design Rules : The MOSIS stands for MOS Implementation Service is the IC fabrication service available to universities for layout, simulation, and test the completed designs. The MOSIS rules are scalable λ rules.

What is lambda in Microwind?

Lambda Units The Microwind software works is based on a lambda grid, not on a micro grid. Consequently, the same layout may be simulated in any CMOS technology. The value of lambda is half the minimum polysilicon gate length.

What is the use of pull up network in CMOS circuits?

Hope it is now more clear. A pull-up network introduces a sizeable impedance between the node of interest (the node you are trying to pull up) and the supply. This means that if your network tries to bring the node of interest to a low voltage, it will be able to do it without too much energy cost/current draw.

Which is a combination of pull up and pull down networks?

Pull up and Pull Down Networks : A complementary MOS gate is a combination of two networks the Pull Up Network (PUN) and the Pull Down Network (PDN). Figure below shows the ‘N’ input logic gate where all inputs are distributed to both the PUN and PDN.

What’s the difference between PMOS and NMOS in pull down network?

If we use PMOS in pull down network, then its gate terminal should be provided with a negative voltage. Similarly if we use NMOS in pull up network, then its gate terminal should be provided with a voltage that is more positive than Vdd. So the voltages corresponding to logic states at input are different from that at output.

How does a pull up and pull down inverter work?

—> The active PULL-UP and PULL-DOWN devices provide the inverter with high output driving capability in both direction. This speeds up the operation considerably. —> The most appreciable fact about the inverter is that the input resistance of the inverter is infinite.