Design of reflection amplifiers. A

A circuit consisting of a source and load with the amplifier 'black box' containing a negative conductance is considered, taking into account the case in which the amplifier has only one port and the power gain is the ratio of the power incident to the power reflected from the negative conductance amplifier. Reflection amplifiers of this form have use at high frequencies where conventional devices such as transistors and FETs cannot as yet operate. Practical negative resistance devices (NRDs) are discussed, giving attention to circuit models for NRDs and amplifier circuits using NRDs. A fundamental theorem for negative resistance circuits is considered along with the synthesis of broadband reflection amplifiers. A description is presented of a general design procedure for an arbitrary choice of gain and bandwidth.