NOT gates oscillator

I am trying to simulate the oscillator with 2 gates (CD 4049) on the diagram attached but NOT

(1) the frequency is approximately 12 MHz and is not affected by the values of C and R

(2) the waveform in the net is incorrect

(3) oscillates also disconnect C at the same frequency

Hello

Although this circuit seems simple, its delicate so he could simulate correctly, requiring a fair understanding of the concepts of simulation in mixed mode. I'll try to summarize the problem and suggest a solution.

First of all, you're dealing with an unstable circuit; There is no stationary solution at the moment = 0 and you must specify the proper initial conditions. If you specify no values of the initial condition, Multisim guess 0 volt for all nodes and eventually generate the swing strange - exactly what are cookies.

However, it turns out that specifying these initial conditions is not sufficient given the nature of the mixed circuit at hand. To understand why, you must first understand the inverters actually use numerical models, non-traditional analog models of SPICE. These digital models communicate with analog models, in this case - the CAP and resistance, through components hybrids called bridges, who does not appear on the diagram (you can see them looking at the Netlist). Now, because you are simulating the ideal Simulation Mode (see tools-> parameters of digital Simulation), ideal bridges, who act as sources of ideal voltage on the output of the inverters, drive the output directly. When you specify the values of the initial condition on the nodes that are connected to the outputs of inverters, these hidden bridges override these values. Generally, the solution would be to change to real simulation Mode, where there are any impedance Converter output as evidenced by the analog circuit. Unfortunately, this gives errors of convergence.

In the attached circuit, I simply added resistance of small exit to address this problem. I have also identified the appropriate initial condition values. Note that swing is now mainly a function of the constant RC and not from delays in the inverter, as you wish.

For our next major release, there are several improvements around the area of simulation of mixed mode of the product. These include significant improvements to the bridges in the actual simulation Mode and explaining detailed documentation on the concepts of simulation in mixed mode.

Kind regards

Tags: NI Software

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