A novel and accurate method for the direct extraction of HBT small-signal hybrid-Pi model parameters is proposed. The main feature of this method is that a unique set of intrinsic parameters is calculated for the whole frequency range of operation using a least-squares data fitting algorithm. This algorithm consists of an estimation from measured S-parameters of a set of new analytical equations derived from the intrinsic HBT equivalent-circuit Y-parameters. Experimental validation on an HBT device with a 2x25 mm emitter was carried out, and excellent results were obtained up to 30 GHz.
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