Invariance property of the μ stability test with respect to the characteristic impedance

Author's Department

Electronics & Communications Engineering Department

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Document Type

Research Article

Publication Title

International Journal of Microwave Science and Technology

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Stability of electrical amplifiers is of crucial importance. Among the popular stability tests is the -test which has many advantages over other tests like the K-Δ test. However, the value of parameter is dependent on the input/output terminal characteristic impedance Z o used and this raises the concern that the predictions of the test are dependent on the choice of Z o. This paper proves that the conclusions of the -test regarding stability/instability remain invariant with Z o. This proof is necessary for gaining confidence in the results of the -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. Copyright © 2012 Amr A. Ibrahim et al.

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