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Tunnel Diode Switching Circuit Disclosure Number: IPCOM000097807D
Original Publication Date: 1961-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

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A pair of backward diodes in this tunnel diode circuit improves its operation.

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Tunnel Diode Switching Circuit

A pair of backward diodes in this tunnel diode circuit improves its operation.

The circuit comprises a tunnel diode 24 across which is coupled a series circuit including a secondary winding 34 and a pair of backward diodes 26 and 28, the latter being in series opposed relation. Winding 34 is coupled to windings 20 and 22 which receive first and second input signals, respectively. Completing the circuit is a bias line 30 which connects diode 24 between a current supply (not shown) and a reference potential, ground 31. Normally, diode 24 is biased for bistable operation such that switching occurs from one stable operating condition to the other when first and second signals of the same polarity are applied to inputs 20 and 22. Diode 24 is returned to the one stable state by applying a single pulse to one of the input windings, the pulse having a polarity opposite to the first and second signals. The notable difference between signal requirements for switching from the one stable state to the other and returning to the one stable state improves the operating performance and the reliability of the circuit in switching applications.

One application of the circuit is in a memory with suitable sensing means connected to the bias line to distinguish between stable operating conditions of diode 24 when switching thereof occurs. Also, the input signals to the circuit are supplied from word and bit drivers suitably connected to 20 and 22.

Such a memory has improved operating margins due to diodes 26 and 28 which establish a load line 32 on diode 24. The slope of the load line is such that no current is drawn from the biasing source whe...