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Microwave Memory Element Using A Tunnel Diode

IP.com Disclosure Number: IPCOM000098201D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Slobodzinski, EJ: AUTHOR

Abstract

The tunnel diode, besides having a negative resistance, is characterized by having a region of low A.C. resistance and a region of relatively high A.C. resistance. Points A and B on the curve are in these respective regions. It is possible to use this characteristic to provide a memory cell usable with microwave logic.

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Microwave Memory Element Using A Tunnel Diode

The tunnel diode, besides having a negative resistance, is characterized by having a region of low A.C. resistance and a region of relatively high A.C. resistance. Points A and B on the curve are in these respective regions. It is possible to use this characteristic to provide a memory cell usable with microwave logic.

The reflection coefficient of a high frequency transmission line is a complex quantity dependent upon the characteristic impedance of the line and its terminating impedance. With a transmission line whose characteristic impedance is between the high and low A.C. resistance values of the tunnel diode, the circuit shown operates as a memory element.

In the circuit, the tunnel diode is used as the terminating impedance of the transmission line, which is shown as a coaxial cable although other types may be used. The load line for the diode is established by the voltage source and the resistance R(L) which are coupled to the line by the quarter wave transformer. This transformer presents a high impedance to the transmission line and thus has negligible effect on the A.C. operation of the circuit. Between the input end of the line and the tunnel diode termination is located a reflectometer. This device provides two outputs, one being proportional to the incident signal being applied at the input end of the line and the other being proportional to the signal reflected from the termination.

The diode is set in...