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在微波频率下,管芯必须密封,以便管壳寄生元件不致使增益有急剧的下降。微波晶体管管壳既保护了晶体管管芯,又可和外电路连接。等效电路是根据2～10千兆赫频率范围内在50欧姆波阻抗 Z。下测得的四个散射参数来确定的。由于我们想检验没有管芯的管壳的影响,所以我们将两根发射极引线短路,即将两条发射极带状线和硅片连接。我们还将基极引线和集电极带状线在同一点上短接,作为另一个短路。值的注意的是,键合引线具有象完整晶体管中相同的长度和厚度。很清楚,由于没
At microwave frequencies, the die must be sealed so that the package's parasitic elements do not cause a sharp drop in gain. The microwave transistor shell protects both the transistor die and the external circuitry. The equivalent circuit is based on a 50 Ohm wave impedance Z in the 2 to 10 GHz frequency range. Measured under the four scattering parameters to determine. Since we wanted to test the effect of the case without a die, we short-circuited the two emitter leads, connecting the two emitter striplines to the silicon. We also short-circuit the base lead and the collector strip line at the same point as the other short-circuit. It is noted that the bond wires have the same length and thickness as in full transistors. Very clear, because no