Fig 1 - uploaded by Miljana Milić
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NE555 based oscillator circuit
Source publication
In this paper we will try to analyse the influence of different statistical shapes and features of the technology parameters distributions to component behaviour, and consequently to the circuit response distribution. In this way it will be possible to create the methodology that will widen the use of Monte Carlo analysis and make it applicable not...
Contexts in source publication
Context 1
... distribution analysis is performed on an oscillator circuit shown in Fig. 1. The element whose process variation data are being examined is the NE555 timer IC. The circuit is described in LTspice [10]. The subcircuit for the IC is the original Linear Technology copyrighted netlist NE555, with additional changes as explained in Section 3. ...
Context 2
... f is the working frequency, and resistances R 1 and R 2 and capacitance C 1 are values of circuit elements according to Fig. 1. Values of all the elements for the designed oscillator are listed in Table I. The corresponding frequency should be 872.7273 Hz. However, after Spice simulation was performed, it was observed that due to specific component modelling the working frequency is 928.79 Hz. This value is taken as nominal in regard of the latter statistical ...
Context 3
... 2 , where T is expressed in percents. The mean of the distribution is the nominal value of the Spice element which is the part of the original netlist. In the case of the uniform distribution, T is in fact the tolerance, i.e. maximal relative distance between the generated value and the center of the distribution. The circuit displayed in Fig. 1 is implemented in LTspice with commands for transient MC simulations. Formulae for random number generation according to the described distributions are also included in the Spice netlist. For different types of distributions, separate netlists are extracted. Namely, the generation of passive elements' values for timer model is defined ...
