New method to determine intrinsic and extrinsic base-collector capacitances of HBT's using the Miller effect

A new method to determine intrinsic and extrinsic base-collector capacitances of HBT's using the Miller effect is presented. The measured S-parameters of an HBT are calibrated and transformed into the ABCD-parameters. The fictitious input and output resistances are added to the HBT and total ABCD-parameters are calculated. The added output resistance degrades the frequency response of the overall network due to the Miller effect, which is used to extract intrinsic and extrinsic base-collector capacitances. The advantage of this method is that it does not require any special test structure.<
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