Wide band amplifier

专利名称：Wide band amplifier

发明人：Minoru Tanaami,Michiko Naito申请号：US07/465253申请日：19900403公开号：US05047732A公开日：19910910

摘要：A wide-band amplifier using a plurality of transistors used in transmission, voice,applications video, high-vision in CATV, etc., for example. In the wide band amplifier, aninput signal is applied in common across the respective bases and correspondingemitters of the plurality of transistors and the respective output currents are withdrawnfrom the transistor collectors. Thus, the output currents of the transistors are reduced,possible distortions in the outputs are greatly reduced, the upper operating frequencylimit (f.sub.T) is increased to about 3 GHz, and possible distortions in the output currentsof the transistors are cancelled by inserting in the input circuit a transistor having thesame characteristic as the first mentioned transistors. The amplifier includes the pluralityof transistors connected in parallel, a constant-current circuit as an input source for thetransistors, and at least one diode having the same characteristic as the transistors andconnected in parallel in the input circuit of the amplifier. A voltage drop across a seriesconnected circuit of a transistor (Tr.sub.D) and a resistor (R.sub. EO) due to the currentflowing through the series connected circuit varies depending on a non-linear portion ofthe base-emitter characteristic of the transistor (Tr.sub.D) compared to a similar amplifierwithout such a transistor (Tr.sub.D). Therefore, a wide-band high-power amplifier isobtained without employing a feedback type configuration. In the wide band amplifier,

distortions are small and eliminated, and signals of high frequencies are amplified withhigh quality and without oscillation.

申请人：KABUSHIKI KAISHA ENU ESU

代理机构：Lowe, Price, LeBlanc & Becker

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