Method for determining the sizing of the transistors of an analog circuit

A method for determining, by using a computer, the values of electrical parameters of transistors of an analog circuit of a system-on-chip, comprising:

• breaking the circuit down into a set of blocks, at least some of which are connected to one another, each block having a defined functionality and comprising an arrangement of transistors which is specific to said block;
• establishing a circuit diagram of the circuit comprising said blocks;
• defining a set of electrical constraints specific to said circuit, to said blocks and to the transistors of each block, as a function of the circuit diagram of the circuit;
• defining electrical circuit parameters, electrical block parameters and electrical transistor parameters;
• for each transistor of the circuit, selecting an operator for calculating values of electrical parameters of said transistor, each calculation operator making it possible, for a given transistor, to calculate values of output electrical parameters as a function of said operator, input electrical parameters and electrical constraints applied to said transistor;
• generating structured graphs of each block of the circuit on a basis of defined constraints and selected operators, each graph comprising a set of nodes;
• assembling the structured graphs of blocks to form an overall graph of the circuit by using equipotentials of said circuit;
• identifying whether at least one of the nodes has a conflict;
• emitting an alarm signal if there is a conflict,
• wherein, if there is a conflict on an input electrical parameter value of an operator, the method comprises eliminating the value of the block parameter giving rise to the conflict from the defined electrical constraints and if there is a conflict on an output electrical parameter value of an operator, the method comprises replacing the selected operator whose output parameter is in conflict with a replacement operator such that the output parameter of the operator giving rise to the conflict is an input parameter of the replacement operator.