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Esaki Diode Binary Counter

IP.com Disclosure Number: IPCOM000097560D
Original Publication Date: 1961-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Gruodis, AJ: AUTHOR

Abstract

A binary counter employing a switching section 10 is coupled to a counting section 12 through capacitor 14. Section 10 comprises Esaki diode 16 biased in a monostable condition at point 17 by a voltage source 18 which includes resistor 20. An inductor 22 is connected between source 18 and the resistor 2 to control the switching speed of 16.

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Esaki Diode Binary Counter

A binary counter employing a switching section 10 is coupled to a counting section 12 through capacitor 14. Section 10 comprises Esaki diode 16 biased in a monostable condition at point 17 by a voltage source 18 which includes resistor
20. An inductor 22 is connected between source 18 and the resistor 2 to control the switching speed of 16.

Section 12 comprises Esaki diode 24 biased to operate at either point 25 or 27 by voltage source 26 which includes resistor 28. An inductor 30 having a magnitude greater than 22 is connected between source 26 and resistor 20 to control the switching speed of 24.

When an input pulse 32 is applied to input 34 and capacitor 36, the voltage across 16 is raised and it switches into the negative resistance region. Current from source 18 then flows to 14. This increases the current to 24 which switches to the low current condition. Inductor 30 causes 24 to delay reaching point 27 until 16 returns to point 17. As 16 switches to point 17, capacitor 14 is discharged and negative current flows to 24 from 14. The negative current speeds the return of 24 to point 27. The negative current does not drive 24 into its negative resistance region. This is because the current flow from the capacitor terminates when the diode reaches point 17. This is before 24 reaches the point 27. An output signal 38 appears at an output terminal 40 while 24 is in the high impedance condition.

When a second input pulse 40 is applied to...