Invariance Property of theμStability Test with respect to the Characteristic Impedance

[摘要] Stability of electrical amplifiers is of crucial importance. Among the popular stability tests is theμ-test which has many advantages over other tests like theK-Δ test. However, the value ofμparameter is dependent on the input/output terminal characteristic impedanceZoused and this raises the concern that the predictions of the test are dependent on the choice ofZo. This paper proves that the conclusions of theμ-test regarding stability/instability remain invariant withZo. This proof is necessary for gaining confidence in the results of theμ-test and should benefit circuit designers. Similar proofs should be extended to all other stability tests for additional insights into their validity under different circuit termination.

[学科分类] 电子、光学、磁材料