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Initially, all nodes are invisible, but the clocks and impulse nodes are subsequently made visible.1 Layout Design, Analysis and Implementation of Combinational and Sequential Circuits using Microwind #2 Ms.Amrita Pahadia #1, Dr. VISIBLE NODE: Click on the "eye" and click on the existing text in the layout to make the chronograms of the node appear. SINUS: The sinusoidal waveform parameters are the amplitude, the offset, frequency and phase. The time-table is updatedĬlick "Erase": all lines situated after the selected element of the time-table are erased. PULSE: The pulse switches from "Level 0" (0 by default) to "Level 1" (VDD by default" depending on the user-defined time table.Įnter the string "0101100" and press "Insert". Use Period/2 to divide the clock period by two. Use Period/2 to multiply the clock period by two. To generate a clock starting from VDD instead of VSS, click on Invert L/H. You may alter level 0 and level 1 by entering a new value with the keyboard. If you ask for a second clock, the period will be multiplied by two. All values are expressed in nano seconds (ns). VDD and VSS: The node is pushed to the power supply voltage with icon VDD, and pulled to the ground 0 V with icon VSS.ĬLOCK: When a node becomes a clock, the parameters of the latter are divided as follows: rise time, level one, fall time, and level zero. The risk of computing divergence is reduced. If you decrease Δt, the simulation speed is decreased too but the numerical precision is improved.
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If you increase Δt the simulation speed improves but the numerical error may lead to unstable simulations. Note: You can modify the minimum simulation step Δt, but it may be dangerous. You may increase the precision by reducing the computational step "Precision", accessible in the menu, expressed in mV. Note that the curves may not be exactly the same. This feature is interesting for circuit with memory effects (Schmidt trigger). The second click on Simulate computes the same for start node varying from VDD to 0. The first simulation computes the value of the stop node for start node varying from 0 to VDD. This mode is useful for the computing of the Inverter characteristics (commutation point), the dc response of the operational amplifier, or for the Schmitt trigger to see the hysteresis phenomenon.
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Initially the start node is the first clock or pulse of the node list, and the stop node is the first varying node. Voltage to obtain transfer characteristics between the X-axis selected node and the Y-axis selected node. In that mode, the dissipated power within the simulation is also displayed.Ĭlick on Voltage vs. You can do the same for the selected stop node.Ĭlick on Voltage and Currents so as to make all voltage curves appear in the lower window, and the VDD, the VSS and the desired MOS currents appear in the upper window. You can change the selected start node in the node list, in the right upper menu of the window. The delay between the selected start node and selected stop node is computed at VDD/2. Time to obtain the transient analysis of all visible signals. Both the above icon or the command Simulate → Start Simulation give access to the automatic extraction and analog simulation of the layout.Ĭlick on Voltage vs.