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Double Action Tunnel Diode Strobe

IP.com Disclosure Number: IPCOM000097998D
Original Publication Date: 1961-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 33K

Publishing Venue

IBM

Related People

Pricer, WD: AUTHOR

Abstract

This is a strobe circuit for memory sensing. The circuit has small signal sensitivity, fast recovery, stable output and voltage gain.

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Double Action Tunnel Diode Strobe

This is a strobe circuit for memory sensing. The circuit has small signal sensitivity, fast recovery, stable output and voltage gain.

Input signals 20 and 22 from a memory array are supplied to high pass filter 24 including capacitors 26, 28, inductors 30, 32 and resistor 34. Filter 24 passes a step signal virtually undistorted for a fixed time constant and then collapses it quickly. The signal is supplied through resistor 33 to node 35 of a pair of tunnel diodes 36 and 38 connected in series aiding relation. Node 35 is also coupled through resistor 40 to node 42 of a second pair of tunnel diodes 44 and 46 connected in series aiding relation. Both sets of diodes are biased through resistor networks to strobing voltage source 48. By proper choice of resistors, diodes 44 and 46 are adapted to copy the decision of corresponding tunnel diodes 36 and 38. The I-V curves 48 and 52 are shown for the diode sets 36, 38 and 44, 46, respectively. In the absence of strobe pulse 49, which is the normal condition of the strobe circuit, the strobe voltage level, together with the resistor network, biases diodes 36 and 38 to operating point A. The diodes 44 and 46 are biased to a second, different operating point B. Diodes 36 and 38 are raised to a switching threshold A' by a voltage V1. Diodes 44 and 46 are raised to a switching threshold B' when a voltage V2 is applied. While in such a condition, one of the diodes of a pair switches, depending on the signal polarity supplied to the strobe circuit by memory. Voltages V1 and V2 are applied by strobing pulse
49. Since V1 occurs before V2, diode 36 or 38 switches before diode 44 or 46, depending upon the input signal polarity. The latter follows the decision of the former. Strobe noise to diodes 36 and 38 is cancelled by resistor 37.

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