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A unified approach for the linear and nonlinear stability analysis of microwave circuits using commercially available tools

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5 Author(s)
Mons, S. ; Microwave Lab., CNES, Toulouse, France ; Nallatamby, J.-C. ; Quere, R. ; Savary, P.
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For the first time, an exhaustive linear and nonlinear stability analysis of multitransistors monolithic-microwave integrated-circuit (MMIC) circuits is presented. A key point of the proposed stability analysis lies in that it can be easily implemented on any computer-aided design (CAD) software. The presented approach allows both linear and nonlinear stability analysis of any complex circuit fed by small or large signals. Two examples are given that demonstrate the accuracy of the method. The first example concerns a MMIC HBT power amplifier, which exhibited division frequency phenomena and spurious oscillations that were detected by simulations and confirmed by measurements. The second example deals with a voltage-controlled oscillator and demonstrates that the method can also predict spurious oscillations in autonomous circuits

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:47 ,  Issue: 12 )