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# Uni Directional Tunnel Diode Logic Circuit

IP.com Disclosure Number: IPCOM000095578D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 19K

IBM

## Related People

Crouse, WG: AUTHOR

## Abstract

The monostable circuit uses a tunnel diode 11 as a switching element. The cathode of diode 1 1 is connected to ground potential. Its anode is connected through inductor 13 and resistor 14 to a positive potential approx. + 2 volts. A first input A is connected through resistor 16 and a second input B through capacitor 17 to the anode of input diode 18. Its cathode is coupled to the junction of diode 11 and inductor 13, i. e., to the diode 11 anode. The junction, in turn, connects to output terminal C.

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Uni Directional Tunnel Diode Logic Circuit

The monostable circuit uses a tunnel diode 11 as a switching element. The cathode of diode 1 1 is connected to ground potential. Its anode is connected through inductor 13 and resistor 14 to a positive potential approx. + 2 volts. A first input A is connected through resistor 16 and a second input B through capacitor 17 to the anode of input diode 18. Its cathode is coupled to the junction of diode 11 and inductor 13, i. e., to the diode 11 anode. The junction, in turn, connects to output terminal C.

In operation, an input signal is first applied to terminal A, thus charging capacitor 17. Then another input signal is applied to terminal B. This causes diode 18 to conduct and switches diode 11 into its high-voltage, low-current state.

A high impedance is presented by inductor 13 to the change in voltage occurring at the diode 1 1 anode in response to the signal at terminal B. After an interval determined by the time constant of the inductor circuit, the current flowing through inductor 13 decreases. This is to such a value where diode 11 can no longer maintain the operating state it assumed when switched by the B pulse. Diode 11 returns to its normal state in which it then remains until triggered again.

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