Build cmos logic functions using cd4007 array analog. The result is a slower cmos inverter when turning the output, as seen in figure 7. Ece2274 nand logic gate, nor logic gate, and cmos inverter s. Pspice provides designers with a systemlevel simulation solution for their designs. Cmos nor gate using cadence tools part 1 schematic. Exporting other files 234 problems 237 moving on 239 appendix. Simulate using pspice a 2 input and a 3 input nor gate. Dual network 2 nmoss in parallel and 2 pmoss in series. The circuit diagram below is what you will build in pspice. Lab6 designing nand, nor, and xor gates for use to design full. Cadence pspice technology offers more than 33,000 models covering various types of devices that are included in. Th resistance is inversely proportional to the wl ratio can be illustrated using pspice simulation. The switching speed depends on the magnitude of the gate overdrive.
This product has been released to the market and is available for purchase. If time permits, build and analyze the 3input cmos nor or gates shown in figures 3 and 4. The tutorial is intended to be followed on a computer in any itap laboratory. Lab6 designing nand, nor, and xor gates for use to design. Once the logic circuit is designed and verified with spice, a cmos hardware circuit can be created using the cd4007 cmos transistor array package. An nbt degraded pmos transistor has a lower more negative threshold voltage, therefore a lower gate overdrive and is turned on slower. Click the input switches or type the a,b and c,d bindkeys to control the two gates. Matlab simulink is a platform for multidomain simulation and modelbased design of dynamic systems. Static logic is a design methodology in integrated circuit design where there is at all times some mechanism to drive the output either high or low. Anyway, if you were looking for pspice for mac, you can try these applications, as these circuit simulators are also quite handy and have similar functions and features. The nor gate is a digital logic gate that implements logical nor it behaves according to the truth table to the right. Digital simulator has a toolbar of digital circuit elements, including logic gates. Apr 26, 2019 pspice is not available for mac but there are some alternatives that runs on macos with similar functionality.
You can use any form of spice such as pspice, ewp, orcad or icaps. Pspice for circuit theory and electronic devices synthesis lectures on digital circuits and systems. In case of nand gate, 3 pmos will be connected in parallel and 3 nmos will be connected in series, and other way around in case of 3 input nor gate. To compare pspice simulations with experimental observations. For example, in many of the popular logic families, such as ttl and traditional cmos. I prefer graphicall simulation like pspice rather than. It provides a wide variety of component libraries, including cmos, ttl, lineal. Build both the 2 input and 3 input nor gates and confirm their logic function by filling out a truth table for each. Describe the output waveform in each case and explain how it corresponds to the nor of the two inputs, using a truth table format. Cadence capture and pspice tutorial this tutorial is intended to give you needed elements for using cadence capture and pspice to design and simulate the digital logic circuit in homework 2a, problem 2. Static cmos circuit at every point in time except during the switching transients each gate output is connected to either v dd or v ss via a lowresistive path the outputs of the gates assume at all times the value of the boolean function, implemented by the circuit. The structures of xor and xnor are simulated for single gate as well as double gate mosfet in 90nm cmos. Need help for simulating cmos nand logic gate using spice. In this tutorial, we will examine mosfets using a simple dc circuit and a cmos inverter with dc sweep analysis this tutorial is written with the assumption that you know how to do all of the basic things in pspice.
The result is that sometimes neither the ptree nor ntree are conducting and therefore the output is floating. Mar 02, 2020 i want to design a solar cell with my own structure that i planed. Users may prepare netlists with a text editor, or derive them from a circuit diagram using a thirdparty schematiccapture application. In this tutorial, we will examine mosfets using a simple dc circuit and a cmos inverter with dc sweep analysis this tutorial is written with the assumption that you know how to do all of the basic things in. I find really annoying to shut down my mac and then change my partition disk to windows and then use pspice.
Looking for solutions on the web, it is said to set wine for windows98 and override ole32. The pspice simulation environment is available on the general access labs gal in discovery park. Design, layout, and simulation of cmos nandnorxor gates and a fulladder prelab. Mar 10, 2017 comparative study on single gate mosfet and double gate mosfet article info abstract. And see how it change the output parameter along with existing solar cell. Once you have clicked ok in the create pspice project dialog box, the schematic window will open and you are ready to begin adding libraries. Jan 10, 2017 this video shows cmos transistor logic gates nand, and, nor, and or and shows how to use spice programs to analyze the circuits. Ltspice uses level8 for bsim3 and level54 for bsim4 information about models from mosis is found here. Prove that the revised version of the and gate shown in gopalans errata performs the desired and logic function. The harris cd4070b contains four independent exclusiveor gates. Transient analysis analyze transient characteristics of cmos gates by studying an inverter transient analysis signal value as a function of time transient analysis of cmos inverter vint, input voltage, function of time voutt, output voltage, function of time vdd and ground, dc not function of time. Lab6 designing nand, nor, and xor gates for use to. Timing and delays delay of cmos logic gates martin p. It shows ltspice for windows and mac as well as oregano.
Digital electronics is an important subject, common for electrical, electronics, and instrumentation engineering students. Please implement using cmos on pspice spice for both nand and nor also draw by hand choose wl value vdd1. Cmos inverter circuit i cmos nand gate i cmos nor gate circuit. If that doesnt suit you, our users have ranked 28 alternatives to pspice and ten of them are available for mac so hopefully you can find a. Ive to simulate a cmos nand logic gate using spice. Nand and nor gate using cmos technology by sidhartha august 4, 2015 12 comments for the design of any circuit with the cmos technology.
The cd4007 is a general purpose mos array, consequently, there had to be some additional wiring to implement the nor gate. Pspice for circuit theory and electronic devices synthesis lectures on digital circuits and systems tobin, paul on. Oct 01, 2014 output characterstics curve of cmos in orcad pspice. January 25, 2012 ece 152a digital design principles 3 reading assignment brown and vranesic cont 3 implementation technology 3. What is the best software to simulate cmos transistors in a logic. Browse cadence pspice model library cadence pspice technology offers more than 33,000 models covering various types of devices that are included in the pspice software. Macspice then builds a numerical model of the circuit and analyses this. The cd4007 contains 3 complementary pairs of nmos and pmos transistors. This applet demonstrates a very compact but tricky realization of an xor gate based on a cmos transmission gate. This netlist is a list of components and the nodes they connect to. The voltage switching point of nor gate has a low value than ideal value of 2.
Basic cmos gates three input nor gate the nor gate was implemented using a cd4007. Macspice requires a textfile description of the circuit as input. Here, pchannel mosfets q 1 and q 2 are connected in series and nchannel mosfets q 3 and q 4 are connected in parallel. Simulation of basic nor gate using cadence virtuoso tool. Adding libraries if you are using pspice for the first time on your computer or you are using a lab computer, the parts libraries will need to be added. The realization of noninverting boolean functiona such as and or, or xor in a single stage is not possible, and requires the addi tion of an extra inverter stage.
Click the input switches or type the a and b bindkeys to control the circuit. Ive written the code and run it via orcad pspice ad. Download pspice for free and get all the cadence pspice models. It shows ltspice for windows and mac as well as oregano, ngspice, spice2g. In the analysis we will find the id current and the vds voltage at the given values of vdd and vgs. Get access to a fullfledged version of latest cadence pspice simulation software for free including pspice ad, pspice advanced analysis and more. Creating a subcircuit from a netlist 229 example 7. Build the nand gate circuit from prelab on ltspice. Propagation delay versus tid for cmos 3input nand gate pspice results 44 fall time versus tid for cmos 3input nor gate pspice results 46 rise time versus tid for cmos 3input nor gate. To characterize different types of cmos gates inverters, nand and nor gates, and transmission gates.
Our channel has lecture series to make the process of getting started with technologies easy and fun so you can. It deals with the theory and practical knowledge of digital systems and how they are implemented in various digital instruments. I need to do the orcad pspice simulation of the circuit. Combinational logic gates in cmos purdue engineering. These tools allow students, hobbyists, and professional engineers to design and analyze analog and digital systems before ever building a prototype. Creating the nand gate schematic and layout create a 2input cmos nand gate using the same steps as for the nor gate and test its functionality using spice. Importing a netlist file describing a current conveyor 222 example 7.
The same pattern will continue even if for more than 3 inputs. In each case, attach the waveform to the lab report. Include all measurements done with the oscilloscope in your report. This video shows cmos transistor logic gates nand, and, nor, and or and shows how to use spice programs to analyze the circuits. Xiong this tutorial will guide you through the creation and analysis of a simple mosfet circuit in pspice schematic. Constructing a cmos logic circuit using the cd4007 transistor array package. Nonexhaustive list of manufacturers which make or have made these kind of circuits. The most popular mac alternative is circuit simulator, which is both free and open source.
The proper way to test a 4 input nor is to use only 4 voltage sources and drive i0i2, i1i3, i4i6, and i5i7. It can also in some senses be seen as the inverse of an and gate. Cadence capture and pspice tutorial purdue engineering. Cmos nor gate using cadence tools part 1 schematic,symbol. Cadence pspice technology offers more than 33,000 models covering various types of devices that are included in the pspice software. Permission is granted to copy, distribute andor modify this document under the terms of the gnu free documentation license, version 1. Video tutorial on using ltspice on the mac is found here. Designers utilize pspice simulation programs for accurate analog and mixedsignal simulations supported by a wide range of boardlevel models. When launching simulation from schematics, it says unable to find pspicead. For some products, newer alternatives may be available. The following is a list of cmos 4000series digital logic integrated circuits manufacturers.
You can study the timing by applying the right clock signals on the logic gate. Pspice model library includes parameterized models such as bjts, jfets, mosfets, igbts, scrs, discretes, operational amplifiers, optocouplers, regulators, and pwm controllers from various ic vendors. Cd4001b, cd4002b, and cd4025b nor gates provide the system designer with direct implementation of the nor function and supplement the existing family of cmos gates. Cd4011b, cd4012b, and cd4023b nand gates provide the system designer with direct implementation of the nand function and supplement the existing family of cmos gates. Cmos integrated circuit simulation with ltspice pages 1 50. Enumerating all of the conditions in the truth table in table 5. Pspice by cadence design systems, inc is a native analog and mixedsignal circuit simulator. Run drc, circuit extraction and lvs on your nor gate layout and make sure that there are no errors. The complementary gate is naturally inverting, implementing only functions such as nand, nor, and xnor. To one input i applied a constant 5v and the other input is a 05v, 1khz square wave. The simulations verify the correct operation of the nor gate. We need parallel or series connections of nmos and pmos with a nmos source tied directly or indirectly to ground and a pmos source tied directly or indirectly to v dd.
Design, layout, and simulation of cmos nand nor xor gates and a fulladder prelab. Simulate a twoinput nor gale shown in figure 1 using pspice and measure the output voltage at y. The complete cmos gate is constructed by combining the pdn with the pun. A collection of spice simulation models for analog devices products.
This applet demonstrates the static twoinput nand and and gates in cmos technology. I got the transient curve for v1,v3 and v4 but not sure those are correct. Test your nor gate with attaching a 1 khz square wave 05 v to pin 6 and a dc voltage of either zero or 5 v to pin 10. Transient simulation of a cmos nand gate using pspice. The aim of this experiment is to design and plot the dynamic characteristics of 2input nand, nor, xor and xnor gates based on cmos static logic introduction. Download pspice free trial now to see how pspice can help improve productivity, yield and reliability of your circuits. In this chapter, the design of the inverter will be extended to address the synthesis of arbitrary digital gates such as nor, nand and xor. Run a dc sweep of the nand circuit by sweeping vin2 from 0v to 10v with increments of 1v. Keep the nmos size the same, but change the pmos to 2010.
Cmos transistor logic gates and spice analysis ltspice. Or, both the ptree and the ntree are conducting causing the output to be midlevel and lots of current consumption. Circuitlab provides online, inbrowser tools for schematic capture and circuit simulation. Design, layout, and simulations of cmos nand, nor, xor gates and a fulladder. Ltspice simulation of a nor static logic gate with 3 parallel nmos and 3 series pmos. Nor is the result of the negation of the or operator. For the prelab i first backed up my library and labs by zipping them and uploading the zipped file to dropbox. Transistor level implementation of cmos combinational logic. Ltspice logic models electronics forum circuits, projects. The objective of this lab activity is to build the various cmos logic functions possible with the cd4007 transistor array. Spice simulation cmos vlsi design slide 24 power measurement qhspice can measure power instantaneous pt or average p over some interval. A high output 1 results if both the inputs to the gate are low 0.