Method and device for calculating branch current of direct-current working point of nonlinear circuit
A DC operating point, nonlinear circuit technology, applied in computing, electrical digital data processing, special data processing applications, etc., can solve the waste of computing resources, the degradation of computing performance, and the inability to obtain the DC operating point of nonlinear circuits in an economical and effective way. problems such as the branch current of the
Active Publication Date: 2014-11-26
SYNOPSYS SHANGHAI
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However, the calculation of more than half of the branch currents is repeated, resulting in a waste of computing resources and a decrease in computing performance
[0006] Therefore, the existing technology only detects the branch current by inserting a zero-volt voltage source, or calculates the current of each port in the calculation of each device, and cannot obtain the required nonlinear circuit in the most cost-effective manner Branch current at DC operating point
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[0014] In order to better understand the spirit of the present invention, it will be further described below in conjunction with preferred embodiments of the present invention. The direction of the present invention discussed here is a method and device for calculating the branch current of the DC operating point of the nonlinear circuit. In order to have a thorough understanding of the present invention, detailed steps and components will be presented in the following description. Obviously, the practice of the invention is not limited to specific details familiar to those skilled in circuit design. On the other hand, well-known components or steps have not been described in detail so as not to unnecessarily limit the invention. The preferred embodiments of the present invention will be described in detail as follows, however, the present invention can be widely implemented in other embodiments besides these detailed descriptions, and the scope of the present invention is no...
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The invention relates to a method and a device for calculating branch current of a direct-current working point of a nonlinear circuit. The method comprises the following steps of: establishing a first circuit equation matrix according to the nonlinear circuit, and calculating the direct-current working point; storing the calculated and converged state variable; newly increasing a zero volt voltage source at the position to obtain the branch current, and establishing a second circuit equation matrix; mapping the state variable into the second circuit equation matrix; solving a branch current detection matrix and a branch current detection right-hand vector according to the matrix element and the right-hand vector of the second circuit equation matrix; and solving the branch current to be obtained according to the branch current detection matrix and the branch current detection right-hand vector.
Description
technical field [0001] The invention relates to a calculation method and device for a direct-current operating point of a nonlinear circuit, in particular to a calculation method and a device for branch currents of a direct-current operating point of a nonlinear circuit. Background technique [0002] The circuit simulation software (Simulation Program with Integrated Circuit Emphasis, HSPICE) needs to perform DC analysis before performing any form, so as to establish the DC bias point of the circuit. With this as a starting point, other performance simulations such as transients, AC small signals, and noise can be performed. The essence of the calculation of the DC operating point of the circuit is to solve a nonlinear algebraic equation system in mathematics. In order to establish the DC analysis point of the circuit, HSPICE must solve a set of nonlinear equations describing the behavior of the circuit, which can be numerically solved by commonly used nonlinear algebraic e...
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IPC IPC(8): G06F17/50
Inventor 周松
Owner SYNOPSYS SHANGHAI