A Linearized Transient Analysis Method For Computing Frequency Response In Circuit Simulators

A new method for computing electronic circuit small-signal frequency response is introduced. This method, when implemented in a circuit simulator that has a transient analysis capability, requires minimal additional memory and software. Because complex arithmetic is not required, this method is particularly suited to minicomputer simulators. The frequency response of both linear and nonlinear circuits is possible. The frequency response of high-Q circuits, although more time consuming, is also possible. Magnitude and phase errors of less than 1% and 0.5 degrees, respectively, are easily attainable. Speed ratios between this method and a conventional ac analysis vary depending on the circuit Q. For circuits with Q less than 1, this ratio is typically 10:1.