The Tunnel Diode as a Linear Network Element

T h e small signal " C , -- R " model of the tunnel diode (Fig. 1) provides a fairly good representation over a wide range of frequencies, and is much simpler to use in a general s t u d y of network properties t h a n the " L C , -- R " model (Fig. 2) which includes, in addition, the series inductor. The simpler model has been used extensively by network theorists. 1 ' 10 T h e primary purpose of this paper is to define in an explicit manner the class of n X n open-circuit impedance and short-circuit admittance matrices t h a t are realizable with lossless reciprocal elements and a tunnel diode characterized by the " L C , -- R" model. The results constitute an extension of the theory presented in Ref. 10* for the " C , -- R" model. T h e main interest in this problem to date relates to the * Although the present paper is self-contained, some familiarity with the earlier work would be of assistance to the reader. 1537 1550 T H E B E L L SYSTEM TECHNICAL J O U R N A L , S E P T E M B E R